---

Most Important Topics in Exercise Therapy for MPT Entrance

---

1. Foundations of Exercise Therapy

• Isotonic (concentric + eccentric), isometric, isokinetic - definitions, differences, clinical uses
• Open kinetic chain (OKC) vs. closed kinetic chain (CKC) - examples and when to use each
• Active, active-assisted, passive exercise - indications
• Resisted exercises - manual vs. mechanical
• Aerobic vs. anaerobic exercise - energy systems (ATP-PC, glycolytic, oxidative)

• Muscle strength, endurance, power, flexibility, coordination
• SAID principle (Specific Adaptation to Imposed Demands)
• Overload principle, reversibility, specificity, progression

---

2. Muscle Strength & Manual Muscle Testing (MMT)

• MRC/Kendall grading scale (0-5 with criteria for each grade) - very frequently tested
• Grade 3 = movement against gravity (pivot point)
• Normal = Grade 5
• Testing positions for individual muscles
• Difference between MMT and dynamometry
• Factors affecting muscle strength: age, sex, fiber type, cross-sectional area

---

3. Range of Motion (ROM) & Flexibility

• Normal ROM values for all major joints (shoulder, hip, knee, ankle, spine) - memorize these
• Goniometry: axis, stationary arm, movable arm placement for each joint
• End-feel types: bony, capsular, soft tissue, spasm, boggy, empty - Cyriax classification
• Stretching types: static, ballistic, dynamic, PNF (Hold-Relax, Contract-Relax, HVLAT)
• PNF stretching - autogenic inhibition vs. reciprocal inhibition mechanisms

---

4. PNF (Proprioceptive Neuromuscular Facilitation)

• Diagonal patterns: D1 and D2 for upper and lower limb (flexion/extension components)
• PNF techniques: Rhythmic Initiation, Slow Reversal, Hold-Relax, Contract-Relax, Repeated Contractions, Rhythmic Stabilization
• Neurophysiological basis: Sherrington's law of irradiation, reciprocal inhibition, successive induction
• Indications: neurological conditions, post-surgical rehab, sports

---

5. Therapeutic Exercise Progression

• FITT principle: Frequency, Intensity, Time, Type
• RICE/PRICE/POLICE protocol for acute injuries
• De Lorme and Watkins progressive resistive exercise (PRE):
  • 10 RM concept
  • Three sets: 50%, 75%, 100% of 10 RM
• Oxford technique (reverse of De Lorme)
• Daily Adjustable Progressive Resistance Exercise (DAPRE)
• Borg's RPE (Rating of Perceived Exertion) scale: 6-20

---

6. Muscle Physiology (Applied)

• Sliding filament theory - actin, myosin, troponin, tropomyosin mechanism
• Motor unit recruitment - size principle (Henneman)
• Fiber types: Type I (slow twitch - fatigue resistant), Type II (fast twitch - IIa, IIx)
• Length-tension relationship and force-velocity relationship
• Muscle hypertrophy vs. hyperplasia
• Delayed Onset Muscle Soreness (DOMS) - cause, timeline (24-72 hours), management
• Muscle atrophy: disuse vs. denervation

---

7. Joint Mobilization & Manipulation

• Maitland grading (Grades I-IV and V):
  • Grade I: small amplitude, beginning of range (pain)
  • Grade II: large amplitude, beginning/middle of range (pain)
  • Grade III: large amplitude, into resistance
  • Grade IV: small amplitude, into resistance (stiffness)
  • Grade V: thrust/manipulation
• Convex-concave rule (Arthrokinematics): Roll and glide directions
• Accessory movements: gliding, rolling, spinning, distraction, compression
• Cyriax capsular pattern vs. non-capsular pattern

---

8. Balance, Proprioception & Coordination Exercises

• Frenkel's exercises - for sensory ataxia (tabes dorsalis)
• Romberg's test - positive indicates loss of proprioception or vestibular function
• Balance training progression: stable to unstable surface, eyes open to eyes closed
• Vestibular rehabilitation exercises
• Core stabilization: inner vs. outer core units

---

9. Aquatic / Hydrotherapy

• Archimedes principle - buoyancy and its therapeutic uses
• Therapeutic pool temperature: 33-36°C (neutral warmth)
• Hydrostatic pressure, turbulence, viscosity effects
• Bad Ragaz ring method - patterns in water
• Halliwick concept (ten-point program)
• Indications and contraindications of hydrotherapy

---

10. Breathing Exercises & Chest Physiotherapy

• Diaphragmatic breathing technique
• Pursed-lip breathing - used in COPD (increases PEEP)
• Incentive spirometry
• Postural drainage positions for each lung lobe
• ACBT (Active Cycle of Breathing Technique): Breathing Control - Thoracic Expansion Exercises - Forced Expiratory Technique
• Huffing vs. coughing
• Percussion, vibration, shaking - differences and applications

---

11. Endurance Training & Cardiac Rehabilitation

• Target Heart Rate: 60-85% of max HR (220 - age)
• Karvonen formula: THR = [(HRmax - HRrest) x intensity%] + HRrest
• VO2 max - gold standard for cardiorespiratory fitness
• Phase I, II, III, IV cardiac rehabilitation programs
• METs (Metabolic Equivalents): 1 MET = 3.5 mL O2/kg/min
• RPE scale application in cardiac rehab

---

12. Posture & Ergonomics

• Ideal posture - plumb line alignment: earlobe, shoulder, greater trochanter, lateral malleolus
• Common postural deviations: kyphosis, lordosis, scoliosis, forward head posture, flat back
• Kendall postural classification
• Muscle imbalance: Janda's upper and lower crossed syndromes (very commonly tested)

---

13. Gait Analysis

• Normal gait cycle: stance phase (60%) vs. swing phase (40%)
• Phases: Initial contact, Loading response, Mid-stance, Terminal stance, Pre-swing, Initial swing, Mid-swing, Terminal swing
• Step length, stride length, cadence, walking speed - definitions
• Common gait deviations and their causes (Trendelenburg, antalgic, steppage, scissor, Parkinsonian)
• Muscle activity during gait: gluteus medius role (key)

---

14. Commonly Tested Specific Techniques

---

16. Quick-Fire High-Yield Facts

• Muscle strength testing is most reliable at Grade 3 level
• Isometric contraction = no joint movement, maximum tension
• Eccentric contraction = muscle lengthens while contracting (greatest tension generated, most DOMS)
• Concentric = shortening
• Isokinetic = constant velocity (Cybex machine)
• 1 MET = resting oxygen consumption
• VO2 max decreases ~1% per year after age 25
• Overtraining syndrome: decreased performance + increased RPE
• Maitland Grade V = manipulation (requires special training)
• Convex surface moves: roll and glide in opposite directions
• Concave surface moves: roll and glide in same direction
• PNF D1 Flexion UL: Shoulder flexion + adduction + ER, elbow flex, wrist flex-adduction
• PNF D2 Flexion UL: Shoulder flexion + abduction + ER, elbow flex, wrist ext-abduction
• Normal shoulder flexion = 180°, abduction = 180°, ER = 90°, IR = 70°
• Normal hip flexion = 120°, extension = 30°, abduction = 45°
• Normal knee flexion = 135°, dorsiflexion = 20°, plantarflexion = 50°

---

Priority Study Order for MPT Entrance

1. MMT grading + ROM values (always 4-5 questions)
2. Types of exercise + muscle contraction types
3. PNF patterns and techniques
4. De Lorme PRE / FITT principles
5. Maitland grading + convex-concave rule
6. Breathing exercises / ACBT
7. Gait cycle phases and deviations
8. Williams vs. McKenzie
9. Frenkel's + balance training
10. Aquatic therapy principles

---

COMPLETE EXERCISE THERAPY NOTES FOR MPT ENTRANCE

---

TOPIC 1: FOUNDATIONS OF EXERCISE THERAPY

Types of Muscle Contraction

Isometric Contraction

• The muscle generates tension but does not change in length and there is no joint movement
• Example: pushing against a wall, holding a weight still in mid-air
• Produces maximum tension at the specific joint angle trained (angle-specific strength gain)
• Used early in rehab when joint movement is painful or contraindicated (e.g., post-fracture, immediately post-op)
• No cardiovascular burden (blood pressure rises, but metabolic demand is low)
• Disadvantage: strength gain is limited to the trained angle (only ±10° carry-over)

Isotonic Contraction

• The muscle changes length while the load (resistance) remains constant
• Two subtypes:

• Muscle shortens while contracting
• Example: biceps curl lifting phase
• Produces least tension among the three types
• Most common in daily functional activities
• Less DOMS (delayed onset muscle soreness)

• Muscle lengthens while contracting (controls movement against gravity)
• Example: biceps curl lowering phase, walking downstairs (quadriceps)
• Produces the greatest tension of all contraction types
• Uses fewer motor units for same force = very efficient
• Responsible for most DOMS (micro-tears in muscle fibers)
• Used in tendon rehab (Achilles tendinopathy - Alfredson protocol)
• Dangerous if done excessively in untrained individuals

Isokinetic Contraction

• Movement occurs at a constant (pre-set) velocity
• Resistance varies throughout ROM to accommodate the muscle's strength curve
• Requires a special machine: Cybex, Biodex
• Maximum resistance at every point of ROM = maximum training stimulus
• Used for testing and training after knee surgery, sports rehab
• Very expensive, not available in all clinics

---

Open Kinetic Chain (OKC) vs. Closed Kinetic Chain (CKC)

Open Kinetic Chain (OKC)

• The distal segment moves freely (foot or hand is free in the air)
• Example: straight leg raise, knee extension machine, biceps curl
• Isolates specific muscles
• Used to target a single muscle group
• Creates more shear forces at joints (e.g., anterior shear at knee in terminal extension)
• Useful for muscle isolation in early rehab

Closed Kinetic Chain (CKC)

• The distal segment is fixed (foot or hand is in contact with a fixed surface)
• Example: squats, leg press, push-ups, step-ups
• Co-contraction of agonist and antagonist occurs simultaneously
• More functional (mimics real-world movement)
• Less shear at joints, more joint compression (safer for ACL rehab)
• Preferred in later stages of rehab and sports-specific training

---

Active, Active-Assisted, and Passive Exercise

Passive Exercise

• Movement is produced entirely by an external force (therapist, machine, or gravity)
• Patient's own muscle generates zero effort
• Used when: paralysis, coma, pain prevention, maintaining ROM in immobilized patients
• Does NOT maintain or increase muscle strength
• Maintains joint nutrition, prevents contractures, maintains tissue mobility

Active-Assisted Exercise

• The patient initiates movement but requires assistance to complete the full range
• Used when muscle strength is Grade 2 (can move but cannot overcome gravity) or Grade 3 but fatigues quickly
• Assistance can be manual (therapist) or mechanical (suspension, hydrotherapy)
• Gradually reduce assistance as strength improves

Active Exercise

• Movement is produced entirely by the patient's own muscle contraction
• No assistance, no resistance
• Used when strength is at least Grade 3 (can move against gravity)
• Maintains joint ROM, maintains muscle tone, improves coordination
• Progression from here is to add resistance (resisted exercise)

Resisted Exercise

• Active exercise performed against an external resistance
• Resistance can be: manual (therapist's hand), weights, resistance bands, machines
• Increases muscle strength, power, and endurance depending on the program

---

Training Principles

SAID Principle (Specific Adaptation to Imposed Demands)

• The body adapts specifically to the type of stress placed on it
• If you train for strength, you gain strength (not necessarily endurance)
• If you train one arm, only that arm gets stronger
• Explains why exercise programs must match the patient's functional goal

Overload Principle

• For adaptation to occur, the exercise stress must exceed the current capacity of the body
• If you always lift the same weight, no further improvement occurs
• Basis of progressive resistive exercise (increasing load over time)

Reversibility (Use it or lose it)

• Adaptations gained through exercise are lost when training stops
• Strength starts declining within 2-3 weeks of detraining
• Endurance declines faster than strength
• Explains why maintenance programs are needed

Specificity Principle

• Training effects are specific to the type of exercise, muscles used, velocity, and energy system
• Slow training makes you better at slow movements, not fast ones
• Aerobic training does not improve anaerobic capacity significantly

Progression Principle

• Exercise intensity, volume, or complexity must be gradually increased over time
• Too rapid = injury; too slow = no adaptation
• Must follow a logical rehabilitation progression

---

Energy Systems

ATP-PC System (Phosphagen System)

• Immediate energy, no oxygen needed (anaerobic)
• Duration: 0-10 seconds
• Used in: sprinting, jumping, explosive lifting
• Phosphocreatine donates its phosphate group to regenerate ATP from ADP

Glycolytic (Lactic Acid) System

• Short-term energy, no oxygen (anaerobic)
• Duration: 10 seconds to 2 minutes
• Produces lactate (lactic acid) as a byproduct
• Used in: 400m run, intense interval training
• Lactate causes muscle burning sensation (not DOMS)

Oxidative (Aerobic) System

• Long-term energy, requires oxygen
• Duration: beyond 2 minutes
• Produces ATP from carbohydrates, fats, and proteins via Krebs cycle + electron transport chain
• Used in: marathon, cycling, swimming distance
• Most efficient - produces 36-38 ATP per glucose molecule

---

TOPIC 2: MANUAL MUSCLE TESTING (MMT)

MRC Grading Scale (Most Tested)

• Grade 2 = gravity eliminated = patient positioned so the limb moves horizontally
• Grade 3 is the key benchmark - if a muscle can move against gravity, it passes Grade 3
• Difference between 4 and 5 is subjective (how much resistance is "full"?)
• Grades 4- and 4+ are sometimes used clinically to subdivide Grade 4

Gravity-Eliminated Testing Positions

• For hip flexors: patient lying on side, supported limb flexes forward
• For knee extensors: patient lying on side (not sitting), extends knee horizontally
• For shoulder abductors: patient lying on back, arm lifts in the horizontal plane

Factors Affecting Muscle Strength

• Age: peaks at 20-30 years, declines after 40
• Sex: males typically 30% stronger than females (more testosterone, larger cross-section)
• Muscle cross-sectional area: biggest predictor of strength
• Fiber type: Type II fibers produce more force
• Motivation/neural factors: CNS drive contributes significantly
• Fatigue: reduces strength acutely
• Pain: inhibits muscle activation (arthrogenic inhibition)

---

TOPIC 3: ROM, FLEXIBILITY & STRETCHING

Normal ROM Values (Memorize These)

Goniometry

• Stationary arm: aligned with the proximal bone (stays still)
• Movable arm: aligned with the distal bone (moves with the limb)
• Axis (fulcrum): placed over the joint axis of motion
• Example for knee flexion: axis = lateral knee joint, stationary arm = femur (lateral), movable arm = fibula

End-Feel (Cyriax Classification)

Normal End-Feels:

• Bony: hard, abrupt stop. Example: elbow extension (olecranon hits fossa)
• Capsular (leathery): firm, slight give. Example: shoulder ER in mid-range
• Soft tissue approximation: soft, spongy. Example: full knee flexion (calf meets thigh)

Abnormal End-Feels:

• Spasm: muscle goes into spasm before end of range (acute injury, pain)
• Boggy (springy): spongy rebound - suggests fluid/effusion in joint
• Empty: patient stops you before end range due to pain (no physical barrier) - serious pathology (tumor, abscess, fracture)
• Springy block: rebound at end range - suggests loose body/meniscus tear

---

Types of Stretching

Static Stretching

• Hold a stretch position for 15-60 seconds, no bouncing
• Mechanism: stress relaxation and creep in viscoelastic tissues
• Most common type in clinical settings
• Safe, reduces injury risk if done after warm-up
• Best for improving general flexibility

Ballistic Stretching

• Bouncing movements at the end of range
• Uses momentum to force the limb beyond its normal ROM
• High risk of injury (activates stretch reflex, causing muscle to contract)
• Not recommended in rehabilitation
• Used by some athletes for sport-specific movements

Dynamic Stretching

• Controlled movement through full ROM without bouncing
• Example: leg swings, arm circles, hip circles
• Improves flexibility while also warming up the neuromuscular system
• Preferred as a warm-up before sport/exercise
• Does not hold the end position

PNF Stretching (see Topic 4 for full detail)

• Most effective stretching technique for increasing ROM
• Uses neurophysiological mechanisms to achieve greater gains than static stretching

---

TOPIC 4: PNF (PROPRIOCEPTIVE NEUROMUSCULAR FACILITATION)

Neurophysiological Basis

Autogenic Inhibition

• When a muscle is under sustained tension, the Golgi Tendon Organ (GTO) fires
• GTO sends inhibitory signals to the same muscle via Ib afferent fibers
• The muscle relaxes (inhibited)
• Used in: Hold-Relax and Contract-Relax techniques
• After contracting the tight muscle maximally, the GTO fires, causing relaxation, and greater stretch is possible

Reciprocal Inhibition

• When the agonist contracts, the antagonist is reflexively inhibited (via Ia afferents from muscle spindle)
• Sherrington's Law of Reciprocal Innervation
• Used in: Contract-Relax with Antagonist Contraction (CRAC)
• Example: contracting the quadriceps inhibits hamstrings, allowing greater hamstring stretch

Irradiation

• Resistance applied to a strong muscle group "irradiates" or overflow to weaker muscles
• Basis of using strong limb patterns to facilitate weak ones
• Used in stroke, neurological conditions

Successive Induction

• Contracting the antagonist first facilitates the subsequent contraction of the agonist
• After resisting flexion, extension becomes stronger

---

PNF Diagonal Patterns

Upper Limb D1 Flexion

• Shoulder: Flexion + Adduction + External Rotation
• Elbow: Flexion or extension (varies)
• Wrist: Flexion + Radial deviation
• Fingers: Flexion + Adduction
• Function: like crossing to scratch opposite shoulder

Upper Limb D1 Extension (opposite)

• Shoulder: Extension + Abduction + Internal Rotation
• Wrist: Extension + Ulnar deviation
• Function: like a backhand tennis stroke

Upper Limb D2 Flexion

• Shoulder: Flexion + Abduction + External Rotation
• Elbow: Flexion or extension
• Wrist: Extension + Radial deviation
• Function: like combing hair (sword-drawing motion)

Upper Limb D2 Extension (opposite)

• Shoulder: Extension + Adduction + Internal Rotation
• Wrist: Flexion + Ulnar deviation
• Function: like reaching into opposite hip pocket

Lower Limb D1 Flexion

• Hip: Flexion + Adduction + External Rotation
• Knee: Flexion or extension
• Ankle: Dorsiflexion + Inversion

Lower Limb D2 Flexion

• Hip: Flexion + Abduction + Internal Rotation
• Ankle: Dorsiflexion + Eversion

---

PNF Techniques

Hold-Relax (HR)

• Therapist moves limb to end of comfortable range
• Patient performs isometric contraction of the tight (shortened) muscle against therapist's resistance (holds, doesn't move)
• 6-10 second hold, then relax
• Therapist moves into the new range
• Mechanism: autogenic inhibition (GTO fires in tight muscle)

Contract-Relax (CR)

• Similar to Hold-Relax but the contraction is isotonic (the tight muscle moves through range with resistance)
• Therapist resists the movement
• After contraction, relax, then new stretch
• More intense than Hold-Relax

Slow Reversal (SR)

• Alternating isotonic contractions of agonist and antagonist
• Patient moves actively into range, then actively returns
• Builds strength through full range in both directions

Rhythmic Initiation

• Movement starts with passive, then progresses to active-assisted, then active, then resisted
• Used in patients with rigidity (Parkinson's), hypertonia, or poor motor initiation
• Teaches the movement pattern before resisting it

Rhythmic Stabilization

• Simultaneous isometric contractions of agonist and antagonist while therapist resists both
• Builds co-contraction and joint stability
• Used for stability of shoulder, knee, trunk

Repeated Contractions

• Repeated stretches at the beginning of range or at a point of weakness to stimulate more powerful contraction
• Uses the stretch reflex to facilitate weak muscles

---

TOPIC 5: THERAPEUTIC EXERCISE PROGRESSION

De Lorme and Watkins Progressive Resistive Exercise (PRE)

• The maximum weight that can be lifted exactly 10 times with proper form
• First, determine the 10 RM for the target muscle

• Starts light (warm-up), progressively increases to maximal effort
• Re-test 10 RM weekly and adjust loads accordingly
• Based on: overload principle - the 3rd set at 100% provides the training stimulus

Oxford Technique

• Reverse of De Lorme
• Starts at 100% of 10 RM and decreases | Set | Load | |---|---| | Set 1 | 100% of 10 RM | | Set 2 | 75% of 10 RM | | Set 3 | 50% of 10 RM |
• Rationale: exercise when fresh (full capacity first)
• Less popular than De Lorme today

DAPRE (Daily Adjustable Progressive Resistance Exercise) - Knight

• More dynamic: adjusts load daily based on the patient's actual performance
• Uses 4 sets

• 0-2 reps: decrease weight by 5-10 lbs
• 3-4 reps: decrease weight by 0-5 lbs
• 5-6 reps: keep the same
• 7-10 reps: increase by 5-10 lbs
• 11+ reps: increase by 10-15 lbs

---

FITT Principle (Exercise Prescription)

• For aerobic training (ACSM guidelines): F=3-5/week, I=55-90% HRmax, T=20-60 min
• For strength training: F=2-3/week (same muscle group), I=60-80% 1RM, 8-12 reps, 2-4 sets

---

PRICE Protocol (Acute Injury Management)

• P = Protection (prevent further injury)
• R = Rest (relative rest, avoid aggravating activity)
• I = Ice (cold for 15-20 minutes, vasoconstriction, reduces inflammation)
• C = Compression (bandage to reduce swelling)
• E = Elevation (raise limb above heart level to drain fluid)

• "Optimal Loading" replaced "Rest" because early controlled loading speeds recovery

---

Borg's RPE Scale (Rating of Perceived Exertion)

• Scale: 6 to 20 (developed by Gunnar Borg)
• 6 = no exertion at all (resting)
• 11 = light
• 13 = somewhat hard (moderate intensity)
• 17 = very hard
• 20 = maximal exertion
• Formula: RPE × 10 ≈ Heart Rate (e.g., RPE of 13 ≈ HR of 130 bpm)
• Used when HR monitoring is not possible (in cardiac patients with pacemakers, on beta-blockers)

---

TOPIC 6: MUSCLE PHYSIOLOGY (APPLIED)

Sliding Filament Theory

• Actin (thin filament): has active sites, covered by tropomyosin and troponin complex at rest
• Myosin (thick filament): has cross-bridge heads that bind to actin

1. Motor neuron fires → action potential travels to neuromuscular junction (NMJ)
2. Acetylcholine (ACh) released from synaptic vesicles
3. ACh binds to receptors on motor end plate → generates end plate potential
4. Action potential spreads through T-tubules into muscle fiber
5. T-tubules stimulate sarcoplasmic reticulum → Ca²⁺ released
6. Ca²⁺ binds to troponin C on the actin filament
7. Troponin moves tropomyosin away from actin active sites → active sites exposed
8. Myosin head binds to actin → forms cross-bridge
9. Power stroke: myosin head pivots, pulls actin toward center of sarcomere (H-zone narrows)
10. ATP binds to myosin → cross-bridge detaches
11. ATP hydrolyzed → myosin re-cocks for next cycle
12. Cycle repeats as long as Ca²⁺ is present
13. When stimulation stops: Ca²⁺ pumped back into SR → troponin blocks active sites → relaxation

---

Motor Unit Recruitment - Size Principle (Henneman)

• Motor units are recruited in order of increasing size (small → large)
• Small motor units (Type I fibers): recruited first, fatigue slowly, low force
• Large motor units (Type II fibers): recruited later, fatigue quickly, high force
• For low-intensity tasks (walking): only small motor units active
• For high-intensity tasks (sprinting, heavy lifting): all motor units recruited including large ones

---

Muscle Fiber Types

---

Length-Tension Relationship

• A muscle generates maximum force at its optimal (resting) length (slightly stretched, ~1.2x resting)
• At very short or very long lengths, force production decreases
• Clinical application: muscles work best near mid-range of their length

Force-Velocity Relationship

• Concentric: as velocity increases, force decreases (inverse relationship)
• Eccentric: as velocity increases, force also increases slightly
• Isometric is at zero velocity and has moderate force
• This is why isokinetic training at slow speeds produces more force than fast speeds (for concentric)

---

DOMS (Delayed Onset Muscle Soreness)

• Definition: muscle pain and stiffness that peaks 24-72 hours after unaccustomed eccentric exercise
• Cause: micro-tears in muscle fibers and connective tissue, inflammatory response
• Mechanism: primarily caused by eccentric contractions
• Symptoms: stiffness, tenderness, reduced strength (temporary), slight swelling
• Management: light exercise (active recovery), gentle stretching, NSAIDs, massage, cold therapy
• Not to be confused with acute muscle soreness (during exercise from lactate)
• DOMS is NOT prevented by warm-up alone

---

Muscle Atrophy

Disuse Atrophy

• From immobilization or inactivity
• Both Type I and Type II fibers shrink
• Type II fibers atrophy faster
• Reversible with retraining

Denervation Atrophy

• From damage to the motor nerve
• Muscle loses all neural input
• Develops faster and more severe than disuse atrophy
• Fibrillations and positive sharp waves on EMG
• If re-innervation occurs: recovery possible; if not: eventually replaced by fibrous tissue

---

TOPIC 7: JOINT MOBILIZATION & MANIPULATION

Maitland Grading System (Grades I-V)

---

Arthrokinematics (Joint Surface Motion)

Convex-Concave Rule (Kaltenborn)

• Shoulder (GH joint): Humeral head (convex) moves on Glenoid (concave)
  • When arm abducts (humerus rolls superiorly), the humeral head glides inferiorly (opposite)
  • Clinical: loss of inferior glide = restricted abduction → mobilize inferiorly
• Knee (tibiofemoral): Tibia (concave) moves on Femur (convex) during open chain
  • Tibia rolls anterior during extension → tibia also glides anterior (same direction)
  • Clinical: loss of anterior tibial glide = restricted knee extension

---

Accessory Movements

• Gliding (translation): one surface slides over another (most common mobilization)
• Rolling: one surface rolls over another (like a ball on the floor)
• Spinning: rotation around a stationary axis
• Distraction (traction): surfaces pulled apart (relieves compression, reduces pain)
• Compression: surfaces pushed together

• Grade I: slack taken up (pain relief, neutralizes gravity)
• Grade II: tissue slack removed (stretching, pain relief)
• Grade III: tissue stretch (increases ROM)

---

Cyriax Capsular vs. Non-Capsular Pattern

Capsular Pattern

• Restriction of ROM in a predictable ratio when the entire joint capsule is involved
• Indicates: capsulitis, arthritis, frozen shoulder
• Each joint has its own pattern:
  • Shoulder: ER > Abduction > IR most limited
  • Hip: IR > Flexion > Abduction most limited
  • Knee: Flexion > Extension most limited
  • Elbow: Flexion > Extension most limited

Non-Capsular Pattern

• Restriction that does NOT follow the capsular pattern
• Indicates: intra-articular pathology (loose body, meniscus), ligament sprain, bursitis, muscle lesion
• Example: a patient with knee meniscus tear may have full flexion but block at 90° on extension (springy end-feel)

---

TOPIC 8: BALANCE, PROPRIOCEPTION & COORDINATION

Proprioception

• The sense of body position in space without looking
• Receptors: muscle spindles (dynamic + static position), GTOs, joint mechanoreceptors, skin receptors
• Two types:
  • Kinesthesia: sense of movement and change in joint angle
  • Position sense (joint position sense): awareness of static limb position

Romberg's Test

• Patient stands with feet together, arms at sides
• Phase 1: Eyes open → stable = normal
• Phase 2: Eyes closed → patient sways/falls = Romberg's positive
• Positive Romberg's = patient depends on vision to compensate for lost proprioception or vestibular function
• Indicates: sensory ataxia (posterior column lesion - dorsal column), peripheral neuropathy, vestibular disorder
• Differentiating: if unsteady with eyes OPEN too = cerebellar ataxia (not positive Romberg's - both eyes open and closed are unsteady)

---

Frenkel's Exercises (for Sensory Ataxia)

• Designed for patients with sensory ataxia (loss of proprioception in lower limbs)
• Classic cause: Tabes Dorsalis (syphilis affecting posterior columns), multiple sclerosis, peripheral neuropathy
• Principles: uses vision to substitute for lost proprioception; exercises are done slowly, precisely, with full attention
• Performed in progression: lying → sitting → standing → walking
• Examples:
  • Lying: sliding heel up and down the leg to a mark
  • Sitting: placing foot on a marked spot
  • Standing: walking along a line marked on the floor
  • Walking: stepping over obstacles, turning

---

Balance Training Progression

1. Bilateral stable surface, eyes open
2. Bilateral stable surface, eyes closed
3. Unilateral (single leg), stable surface, eyes open
4. Unilateral, stable surface, eyes closed
5. Bilateral unstable surface (foam pad, wobble board), eyes open
6. Bilateral unstable surface, eyes closed
7. Unilateral unstable surface, eyes open
8. Unilateral unstable surface, eyes closed
9. Add dual-task (cognitive + balance, e.g., counting backward while balancing)
10. Functional tasks: catching, throwing, sport-specific movements

---

Core Stabilization

Inner Core (Local Stabilizers)

• Deep muscles that stabilize the spine directly
• Transversus abdominis (TA): deepest abdominal muscle, forms a corset around the spine
• Multifidus: deep spinal muscle, controls intersegmental stability
• Pelvic floor muscles
• Diaphragm
• These fire before limb movements (anticipatory postural activation)
• In people with chronic low back pain: TA activation is delayed (Hodges & Richardson research)

Outer Core (Global Stabilizers)

• Larger muscles that move the trunk and control large forces
• Rectus abdominis, obliques, erector spinae, gluteals
• Activated for high-load tasks

---

Vestibular Rehabilitation

• For patients with vertigo, dizziness, vestibular hypofunction
• BPPV (Benign Paroxysmal Positional Vertigo): dislodged otoconia in semicircular canals
  • Treatment: Epley maneuver (canalith repositioning), Semont maneuver
• Cawthorne-Cooksey exercises: head and eye movements to habituate the vestibular system
• Gaze stabilization exercises: VOR (vestibulo-ocular reflex) training

---

TOPIC 9: AQUATIC / HYDROTHERAPY

Archimedes' Principle

• Any object immersed in fluid experiences an upward buoyant force equal to the weight of fluid displaced
• A person immersed to the neck: body weight reduced to approximately 10% of normal
• Immersed to waist: approximately 50% body weight
• Immersed to chest/axilla: approximately 25-40% body weight
• Clinical use: allows early weight-bearing in water for patients who cannot bear full weight on land (post-fracture, post-arthroplasty, morbid obesity, osteoarthritis)

Properties of Water Used Therapeutically

Buoyancy

• Reduces effective body weight (see above)
• Can be used to assist, support, or resist movement
  • Buoyancy-assisted: moving limb toward water surface (upward)
  • Buoyancy-supported: moving limb horizontally at water surface
  • Buoyancy-resisted: moving limb downward against buoyancy

Hydrostatic Pressure

• Pressure exerted by water on all surfaces of an immersed body equally
• Increases with depth (deeper = more pressure)
• Effects: reduces edema, improves venous and lymphatic return, assists cardiac preload
• Pascal's Law: pressure at any point in fluid acts equally in all directions

Viscosity

• Water's resistance to flow creates drag
• Increases resistance to movement (good for strengthening)
• Faster movement = greater resistance (no need for weights in water)
• Turbulence increases resistance further

Thermal Properties

• Warm water (33-36°C): reduces pain, reduces muscle spasm, improves tissue extensibility
• Cold water: reduces inflammation, vasoconstriction (used in cryotherapy pools for athletes)

---

Therapeutic Pool Temperature Guidelines

• Therapeutic/rehabilitation: 33-36°C (neutral warmth)
• Rheumatoid arthritis: 34-36°C (warm)
• Spasticity reduction: 37-40°C (hot)
• Athlete recovery: 12-15°C (cold)
• Contrast hydrotherapy: alternate hot/cold

---

Halliwick Concept (Ten-Point Programme)

1. Mental adjustment
2. Sagittal rotation control
3. Transversal rotation control
4. Longitudinal rotation control
5. Combined rotation control
6. Upthrust (buoyancy - floating)
7. Balance in stillness
8. Turbulent gliding
9. Simple progression
10. Basic Halliwick movement (swimming)

---

Bad Ragaz Ring Method

• Therapeutic technique using rings (floats) around neck, arms, pelvis, knees to keep patient horizontal in water
• Therapist provides fixed point or resistance; patient's body moves
• Adapted from PNF patterns (same diagonal movements performed in water)
• Used for: neurological rehab, spinal injuries, strengthening, relaxation

---

Contraindications of Hydrotherapy

• Open wounds, skin infections (risk of contamination)
• Uncontrolled bowel/bladder (incontinence without waterproof protection)
• Severe cardiac or respiratory conditions (absolute)
• Epilepsy (relative, can be done with supervision)
• Severe fear of water
• Infectious diseases
• Uncontrolled hypertension

---

TOPIC 10: BREATHING EXERCISES & CHEST PHYSIOTHERAPY

Diaphragmatic (Abdominal) Breathing

• Patient lies supine, one hand on chest, one on abdomen
• Inhale: diaphragm descends → abdomen rises (belly hand rises, chest hand should NOT rise much)
• Exhale: abdomen falls, diaphragm ascends
• Purpose: maximizes tidal volume, reduces respiratory rate, reduces work of breathing
• Used in: COPD, anxiety, post-surgical patients

---

Pursed-Lip Breathing

• Inhale through nose (2 counts), exhale through pursed lips as if blowing a candle slowly (4 counts)
• Creates back-pressure in airways during expiration = auto-PEEP (positive end-expiratory pressure)
• Prevents dynamic airway collapse in COPD (where airways collapse during forced expiration)
• Slows breathing rate, reduces air trapping, improves O2 saturation
• Primary use: COPD, emphysema

---

Incentive Spirometry

• Device with a ball or piston that rises when the patient inhales slowly and deeply
• Provides visual feedback for sustained maximal inspiration (SMI)
• Prevents post-operative atelectasis
• Used: post-surgery (especially thoracic/abdominal), pneumonia, mucus clearance
• Goal: reach and maintain target volume for 3-5 seconds

---

ACBT (Active Cycle of Breathing Technique)

Phase 1: Breathing Control (BC)

• Gentle, relaxed, tidal breathing at normal rate
• Uses diaphragmatic breathing
• Purpose: relax bronchospasm, rest between other phases

Phase 2: Thoracic Expansion Exercises (TEE)

• 3-5 deep slow breaths with a 3-second hold at peak inspiration
• Allows collateral ventilation (air moves behind secretions through pores of Kohn)
• Loosens and mobilizes secretions

Phase 3: Forced Expiratory Technique (FET / Huffing)

• Huff: open glottis, medium-deep inspiration, then forced expiration with an open mouth (as if fogging a mirror) - "haaaa" sound
• Moves secretions from peripheral to central airways
• Lower effort than coughing, less bronchospasm
• Followed by breathing control, then cough to expectorate

---

Huffing vs. Coughing

---

Postural Drainage

---

Percussion, Vibration, Shaking

---

TOPIC 11: ENDURANCE TRAINING & CARDIAC REHABILITATION

Target Heart Rate (THR)

• Maximum HR (HRmax) = 220 - age (formula, not exact for everyone)
• Target Zone = 60-85% of HRmax
• Example: 40-year-old: HRmax = 180 bpm; THR = 108-153 bpm

• HRR (Heart Rate Reserve) = HRmax - HRresting
• THR = (HRR × desired intensity%) + HRresting
• More accurate as it accounts for resting HR (fitness level)
• Example: HRmax=180, HRrest=70, desired intensity=70%
  • HRR = 180-70 = 110
  • THR = (110 × 0.70) + 70 = 77 + 70 = 147 bpm

---

VO2 Max (Maximal Oxygen Uptake)

• The maximum rate at which the body can consume oxygen during maximal exercise
• Gold standard for cardiorespiratory fitness
• Values: average male ≈ 40-50 mL/kg/min; trained athlete ≈ 60-80 mL/kg/min; sedentary female ≈ 27-35
• Declines approximately 1% per year after age 25 in sedentary individuals
• Exercise training can increase VO2 max by 15-30%
• Limited by: cardiac output (mainly), oxygen delivery to muscles, mitochondrial capacity

---

METs (Metabolic Equivalents)

• 1 MET = resting metabolic rate = 3.5 mL O2/kg/min
• Used to quantify exercise intensity in a standardized way
• Examples:
  • Sleeping: 0.9 MET
  • Sitting: 1 MET
  • Walking 3 mph: 3.5 METs
  • Cycling: 6-10 METs
  • Running 6 mph: 10 METs
  • Maximum: 20+ METs in elite athletes
• Used in cardiac rehab to prescribe activities safely after MI or surgery

---

Cardiac Rehabilitation Phases

Phase I (Inpatient/Acute)

• Setting: Hospital (CCU, cardiac ward)
• Starts 24-48 hours after MI if stable
• Activities: deep breathing, ankle pumps, sitting up, short walks in corridor
• Goal: prevent deconditioning, assess exercise tolerance, patient education
• Intensity: 1-2 METs, RPE < 11, HR < HRrest + 20 bpm

Phase II (Early Outpatient)

• Setting: Hospital outpatient department or cardiac rehab center
• Duration: 6-12 weeks
• Monitored exercise (ECG, BP, SpO2 monitoring)
• Progressive walking, cycling, light resistance training
• Patient education: risk factor modification, diet, smoking cessation, medication
• Intensity: progressively increased to 4-7 METs

Phase III (Community-Based)

• Setting: Community gym or home-based, supervised less intensively
• Maintains improvements from Phase II
• Patient becoming more independent
• Duration: 3-6 months or indefinite

Phase IV (Maintenance)

• Setting: Independent (unsupervised or minimally supervised)
• Long-term lifestyle physical activity
• Goal: sustain cardiorespiratory fitness, reduce risk of recurrent events

---

TOPIC 12: POSTURE & ERGONOMICS

Ideal Posture - Plumb Line Alignment

• Lateral view: Earlobe → Shoulder (acromion) → Greater trochanter → Just anterior to lateral knee joint → Lateral malleolus
• Posterior view: Midline of skull → Spinous processes → Gluteal cleft → Midline between feet

---

Common Postural Deviations

Kyphosis

• Excessive posterior curvature of the thoracic spine (hunchback)
• Common in: elderly (osteoporosis), Scheuermann's disease in adolescents
• Associated with: forward head posture, tight pectorals, weak mid-trapezius + rhomboids

Lordosis

• Excessive anterior curvature of the lumbar spine (swayback)
• Common in: pregnancy, obesity, psoas tightness
• Associated with: anterior pelvic tilt, tight hip flexors and lumbar extensors, weak abdominals + gluteals

Scoliosis

• Lateral curvature of the spine with vertebral rotation (in 3D)
• Structural vs. functional (postural)
• Cobb's angle: measured on X-ray to quantify severity
  • < 10°: normal variation
  • 10-25°: mild
  • 25-45°: moderate (brace)

  • 45-50°: severe (surgery)

Flat Back Posture

• Reduced lumbar lordosis (spine too straight)
• Posterior pelvic tilt
• Often caused by: tight hamstrings, weak hip flexors

Forward Head Posture

• Head protrudes forward of the plumb line
• For every 2.5 cm forward: head weight effectively increases by ~10 lbs on the cervical spine
• Associated with: upper cervical extension (suboccipital compression), lower cervical flexion

---

Janda's Crossed Syndromes (Very Commonly Tested)

Upper Crossed Syndrome

• Tight (overactive): Upper trapezius, Levator scapulae, SCM, Pectorals (major + minor), Suboccipital muscles
• Weak (underactive): Deep neck flexors, Rhomboids, Middle trapezius, Serratus anterior, Lower trapezius
• Postural result: Forward head, elevated/protracted shoulders, rounded upper back
• X-pattern: tight muscles cross with weak muscles in an "X" pattern

Lower Crossed Syndrome

• Tight (overactive): Hip flexors (iliopsoas, rectus femoris), Lumbar erector spinae
• Weak (underactive): Gluteus maximus, Gluteus medius, Abdominals (especially TA)
• Postural result: Anterior pelvic tilt, increased lumbar lordosis, slight hip flexion during standing
• Gait deviation: reduced hip extension, increased lumbar extension

---

TOPIC 13: GAIT ANALYSIS

Normal Gait Cycle

Time Distribution:

• Stance phase: 60% of gait cycle (foot on ground)
• Swing phase: 40% of gait cycle (foot in air)
• Double support (both feet on ground simultaneously): ~20% total (10% at beginning and 10% at end of stance)
• At walking speeds, there is always a period of double support
• At running speeds: no double support → instead there is a "float phase" where neither foot is on the ground

---

Phases of Gait (RLA/Rancho Los Amigos Terminology)

Stance Phase (60%)

1. Initial Contact (Heel Strike): Heel contacts ground; hip is flexed ~30°, knee near full extension, ankle neutral
2. Loading Response (Foot Flat): Foot rolls to flat; controlled plantarflexion (tibialis anterior eccentrically controls); knee flexes 15-20° for shock absorption (vastus medialis active); weight transferred to stance limb
3. Mid-Stance: Center of mass rises; body weight over stance foot; full weight-bearing; hip extending, knee extending, ankle dorsiflexing; gluteus medius stabilizes pelvis
4. Terminal Stance (Heel Off): Heel rises; ankle plantarflexes; hip continues extending; forward progression of body
5. Pre-Swing (Toe Off): Toe leaves ground; hip begins flexing; preparation for swing

Swing Phase (40%)

1. Initial Swing: Limb lifts from ground; hip flexes; knee flexes; ankle dorsiflexes (tibialis anterior - most active in early swing)
2. Mid-Swing: Limb swings forward; clearance achieved; tibialis anterior holds foot up
3. Terminal Swing: Knee extends; hip decelerates; hamstrings control limb deceleration; prepares for next heel strike

---

Spatial & Temporal Parameters

• Step: one foot to other foot (right heel strike to left heel strike)
• Stride: same foot to same foot (right heel strike to next right heel strike)
• Step length: distance between consecutive heel strikes of opposite feet (~35-40 cm/step)
• Stride length: ~70-80 cm (2x step length)
• Cadence: number of steps per minute (~100-120 steps/min in adults)
• Walking speed: stride length × cadence/2 (normal ≈ 1.2-1.4 m/s in adults)
• Base of support (step width): lateral distance between feet (~5-10 cm)

---

Muscle Activity During Gait (Key Points)

---

Common Gait Deviations

Trendelenburg Gait

• Cause: Weak gluteus medius on the stance side
• Pattern: The pelvis drops on the swing (non-weight-bearing) side during stance
• Compensated Trendelenburg: Patient leans trunk toward the weak side (to bring COG over hip) - appears like a "waddling" gait
• Seen in: hip abductor weakness, hip OA, superior gluteal nerve lesion

Antalgic Gait

• Cause: Pain in the weight-bearing limb
• Pattern: Shortened stance time on the painful limb; patient rushes off the painful limb quickly
• Seen in: any painful hip, knee, ankle, or foot condition

Steppage Gait (High-Stepping)

• Cause: Weak or paralyzed tibialis anterior (foot drop) → ankle stays plantarflexed during swing
• Pattern: Hip and knee flex excessively to clear the dropped foot
• Seen in: common peroneal nerve palsy, L4-L5 nerve root lesion, Charcot-Marie-Tooth disease

Scissor Gait

• Cause: Bilateral spastic hip adductors
• Pattern: Both legs cross midline (like scissors) due to adductor spasm
• Seen in: Cerebral palsy, bilateral upper motor neuron lesions

Parkinsonian Gait

• Features: Shuffling (reduced step length), festination (accelerating involuntarily), stooped posture, reduced arm swing, difficulty initiating, "freezing"
• Cause: Parkinson's disease (dopamine deficiency in basal ganglia)

Hemiplegic Gait (Circumduction)

• Cause: Spastic hemiplegia after stroke
• Pattern: Affected leg is circumducted (swung outward in a circle) because of inability to flex knee/hip
• Stiff, extended spastic limb - Wernicke-Mann posture

---

TOPIC 14: SPECIFIC TECHNIQUES & QUICK-FIRE FACTS

Williams' Flexion Exercises

• Developed by Paul Williams in 1937
• Indication: Low back pain associated with lumbar lordosis, degenerative disc disease, facet joint arthritis
• Principle: Reduce lumbar lordosis, open the posterior intervertebral foramen, strengthen abdominals
• Exercises include:
  1. Pelvic tilt (flatten lumbar spine to floor)
  2. Single knee to chest
  3. Double knee to chest
  4. Partial sit-up (crunch)
  5. Hamstring stretch
  6. Half-squat
• Avoid in: acute disc herniation with neural tension signs (the flexion increases intradiscal pressure)

McKenzie Extension Exercises

• Developed by Robin McKenzie
• Indication: Disc herniation with posterior nuclear displacement (disc prolapse)
• Principle: Extension "centralizes" referred pain (pain moves from periphery toward the spine) → good sign
• "Centralization phenomenon" is the key concept - pain that moves centrally predicts good outcome with McKenzie
• Exercises:
  1. Lying prone (passive extension)
  2. Prone on elbows
  3. Press-ups (prone push-ups to lumbar extension)
  4. Standing extension
• Contraindicated in: spinal stenosis, spondylolisthesis (extension worsens these)

---

Codman's Pendulum Exercises

• Also called Codman's circumduction or pendulum exercises
• Patient bends forward at waist, lets arm hang freely, performs small circles/pendulum swings using trunk motion
• The arm is passive - no muscle contraction in the shoulder
• Purpose: gentle distraction and mobilization of GH joint, reduces pain, maintains early ROM
• Indication: frozen shoulder (adhesive capsulitis), rotator cuff injuries, post-surgical shoulder
• Used in the very early (acute) phase when active motion is painful

---

Short Arc Quadriceps Exercise

• Patient lies supine, a roll placed under the knee (knee slightly flexed ~30-45°)
• Patient extends knee from 30° flexion to full extension (terminal 30° arc)
• Purpose: Isolates vastus medialis oblique (VMO) - the medial quadriceps responsible for terminal extension
• Indication: Post-knee surgery (ACL reconstruction, total knee arthroplasty), patellofemoral syndrome
• Avoids full range because deep flexion compresses the patellofemoral joint and stresses healing ACL graft

---

Wall Pulley Exercises

• Overhead pulley system attached to wall
• Patient uses the unaffected arm to assist the affected arm in elevation through the pulley mechanism
• Provides active-assisted movement for shoulder elevation (flexion and abduction)
• Indication: Limited shoulder ROM, post-surgical shoulder, frozen shoulder, rotator cuff repair
• Allows graded progression of range

---

Heel-Toe Walking (Frenkel's Walking Exercises)

• Patient walks along a line marked on the floor, placing each foot precisely heel-to-toe
• Uses visual feedback to control coordination
• Part of Frenkel's exercise progression (see Topic 8)
• Used in: sensory ataxia, cerebellar ataxia rehabilitation

---

Straight Leg Raise (SLR)

• In the exercise context (not the neurodynamic test):
• Patient lies supine, one knee bent, other leg straight
• Lift the straight leg to ~45° (contracts hip flexors and creates isometric quadriceps contraction)
• Purpose: Strengthens hip flexors (iliopsoas), quadriceps (isometric), and indirectly the core
• Indication: Early post-op knee (before full active knee extension is safe), quadriceps weakness

---

COMPLETE QUICK-FIRE REVISION FACTS

Muscle Contraction

• Eccentric = greatest force production + most DOMS
• Concentric = least force production
• Isometric = no joint movement + angle-specific gain only
• Isokinetic = constant velocity, maximum resistance throughout (Cybex/Biodex)
• During eccentric: fewer motor units needed for same force = more efficient

MMT

• Grade 0 = no contraction
• Grade 1 = flicker/trace only
• Grade 2 = full ROM, gravity eliminated
• Grade 3 = full ROM, against gravity, NO resistance
• Grade 4 = against some resistance
• Grade 5 = normal, against full resistance

ROM Key Values

• Shoulder abduction = 180°, ER = 90°
• Hip flexion = 120°, extension = 30°
• Knee flexion = 135°
• Ankle dorsiflexion = 20°, plantarflexion = 50°

PNF

• D2 Flexion UL = shoulder flexion + abduction + ER (like combing hair)
• D1 Flexion UL = shoulder flexion + adduction + ER (like reaching across to scratch)
• Hold-Relax uses isometric contraction → autogenic inhibition (GTO)
• Contract-Relax uses isotonic contraction

Exercise Prescription

• 1 RM = maximum load for 1 repetition
• 10 RM = maximum load for exactly 10 reps
• De Lorme: 50% → 75% → 100% of 10 RM
• Oxford: 100% → 75% → 50% of 10 RM (reverse)
• DAPRE: daily adjusted based on last set reps

Maitland

• Grades I & II = pain (free range)
• Grades III & IV = stiffness (into resistance)
• Grade V = HVLAT manipulation

Arthrokinematics

• Convex on concave: glide OPPOSITE to roll
• Concave on concave: glide SAME as roll

Cardiac Rehab

• HRmax = 220 - age
• Karvonen = (HRmax - HRrest) × % + HRrest
• 1 MET = 3.5 mL O2/kg/min
• Phase I = inpatient hospital (1-2 METs)
• Phase II = monitored outpatient (6-12 weeks)
• Phase III = community-based
• Phase IV = independent maintenance

Aquatic Therapy

• Neck depth immersion ≈ 10% body weight
• Waist depth ≈ 50% body weight
• Pool temp for rehab = 33-36°C
• Archimedes = buoyancy = weight of fluid displaced

Breathing

• ACBT = BC → TEE → BC → FET → expectorate
• Pursed lip = auto-PEEP = prevents airway collapse in COPD
• DOMS peaks at 24-72 hours after eccentric exercise
• Frenkel's = for sensory ataxia (uses vision to compensate)

Gait

• Stance = 60%, Swing = 40%
• Gluteus medius = stance phase, prevents pelvis drop
• Trendelenburg = weak gluteus medius (pelvis drops on opposite side)
• Steppage = foot drop (weak tibialis anterior) = common peroneal nerve palsy
• Tibialis anterior = most active in swing phase

Key Formulas

• VO2 max declines ~1%/year after age 25
• Stride = heel to same heel; Step = heel to opposite heel
• Cadence = steps per minute (~100-120 normal)
• RPE × 10 ≈ Heart Rate

---

---

Options to Listen to the Content

On Your Phone

• Android: Use the built-in Text-to-Speech feature
  • Go to Settings → Accessibility → Text-to-Speech
  • Then use Select to Speak to read any text on screen
• iPhone/iPad: Use Speak Screen
  • Settings → Accessibility → Spoken Content → Speak Screen
  • Then swipe down from top with two fingers on any page

On Your Computer

• Windows: Select text → Right-click → "Read Aloud" (in Microsoft Edge browser/Word)
• Mac: Select text → Edit → Speech → Start Speaking
• Google Chrome: Install the extension "Read Aloud" (free)

Copy-Paste Method

• Copy the notes I provided and paste them into:
  • Google Docs → Tools → Voice Typing (reads to you)
  • NaturalReader (naturalreaders.com) - free online TTS tool
  • Microsoft Word → Review → Read Aloud

Study Apps

• Speechify (app) - upload any text and it reads it in natural voice
• Voice Dream Reader - excellent for study material
• Balabolka (free PC software)

---

---

MOST IMPORTANT TOPICS IN ORTHOPEDICS FOR MPT ENTRANCE - COMPLETE NOTES

---

TOPIC 1: FRACTURES - CLASSIFICATION, HEALING & PHYSIOTHERAPY

Definition

---

Classification of Fractures

By Skin Integrity

• Closed (Simple): Skin over fracture is intact
• Open (Compound): Skin is broken, bone may protrude - high risk of infection
  • Gustilo-Anderson classification: Grade I (wound <1 cm, clean), Grade II (wound 1-10 cm), Grade III (wound >10 cm with soft tissue damage) - Grade IIIB and IIIC have vascular and neurological injuries

By Direction of Fracture Line

• Transverse: Perpendicular to bone axis (direct trauma)
• Oblique: At an angle to bone axis
• Spiral: Twisting force wraps around bone
• Comminuted: 3 or more bone fragments (high energy trauma)
• Greenstick: Incomplete fracture, one cortex breaks (children only - bone is softer)
• Torus (Buckle): Bone buckles without breaking through (children)
• Impacted: Bone ends driven into each other
• Avulsion: Fragment pulled off by ligament or tendon (e.g., tibial tuberosity avulsion)
• Stress (Fatigue): Repetitive loading over time (march fracture of 2nd metatarsal in soldiers/athletes)
• Pathological: Fracture through diseased bone (osteoporosis, tumor, Paget's disease)

---

Stages of Fracture Healing (VERY COMMONLY TESTED)

Stage 1: Hematoma Formation (Days 1-5)

• Blood fills the fracture site → hematoma forms
• Inflammatory response: neutrophils, macrophages, cytokines
• Creates a fibrin network scaffold for repair
• Periosteum is torn; bone ends are devascularized

Stage 2: Soft Callus (Fibrocartilaginous Callus) (Days 5 - Weeks 2-3)

• Pluripotent mesenchymal stem cells invade
• Fibroblasts form collagen; chondroblasts form cartilage
• Woven bone starts to appear at periphery
• Callus visible on X-ray from ~2-3 weeks
• Fracture is "sticky" but not yet rigid

Stage 3: Hard Callus (Bony Callus) (Weeks 3-12)

• Cartilage replaced by woven bone via endochondral ossification
• Callus bridges the fracture gap completely
• Fracture is now mechanically stable (clinical union)

Stage 4: Remodeling (Months to Years)

• Woven bone replaced by lamellar (mature) bone
• Wolff's Law: bone remodels along lines of stress
• Medullary cavity restored
• In children: almost complete remodeling; in adults: some residual callus may remain

---

Factors That Delay Fracture Healing

• Poor blood supply (femoral neck = avascular necrosis risk)
• Infection (osteomyelitis)
• Excessive movement at fracture site
• Poor immobilization
• Malnutrition (Vitamin C, D, calcium deficiency)
• Old age, osteoporosis
• Smoking, corticosteroids
• Interposition of soft tissue between fragments
• Distraction (over-traction)

Complications

• Malunion: Fracture heals in abnormal position
• Non-union: Fracture fails to heal (> 6 months no progression)
  • Hypertrophic non-union: good blood supply, poor immobilization (elephant foot)
  • Atrophic non-union: poor blood supply (no callus)
• Delayed union: Slower than expected healing
• Avascular necrosis (AVN): Blood supply cut off → bone death
  • Common sites: Femoral head (neck of femur fracture), Scaphoid (waist fracture), Talus (neck fracture)
• Compartment syndrome (acute emergency)
• Fat embolism
• Nerve and vessel injury

---

Physiotherapy After Fractures

General Principles

• Acute phase: PRICE, positioning, pain management, prevent complications
• Immobilization phase: Maintain ROM of adjacent joints, isometrics for immobilized muscles, prevent DVT (ankle pumps), prevent muscle atrophy
• Post-immobilization: Restore ROM, muscle strength, proprioception, function
• Final phase: Return to activity/sport

Specific Examples

• Colles' fracture (distal radius): Finger exercises immediately, wrist ROM after cast off, grip strength training, proprioception
• Neck of femur fracture: Early mobilization (24-48 hrs post-ORIF), NWB/PWB depending on fixation, progressive gait training
• Tibial shaft: Non-weight bearing → partial → full weight bearing progression

---

TOPIC 2: SPECIAL TESTS OF ORTHOPEDIC ASSESSMENT (HIGHEST YIELD)

Shoulder Special Tests

Neer's Test (Subacromial Impingement)

• Examiner stabilizes scapula, passively flexes shoulder with IR
• Positive: Pain reproduced in subacromial region
• Tests: supraspinatus or biceps tendon impingement under coracoacromial arch

Hawkins-Kennedy Test (Subacromial Impingement)

• Shoulder at 90° flexion + elbow 90° + forced IR
• Positive: Pain in supraspinatus region
• More sensitive than Neer's for impingement

Empty Can Test / Supraspinatus Test (Jobe's Test)

• Shoulder at 90° abduction, 30° horizontal flexion (scapular plane), IR (thumb down = empty can)
• Patient resists downward force
• Positive: Pain or weakness = supraspinatus tear or impingement

Full Can Test

• Same position but ER (thumb up = full can)
• More specific for supraspinatus tear

Drop Arm Test (Complete Rotator Cuff Tear)

• Patient abducts arm to 90°, slowly lowers it
• Positive: Arm drops suddenly, cannot control lowering
• Indicates complete supraspinatus tear

Apprehension Test (Anterior Shoulder Instability/Dislocation)

• Shoulder at 90° abduction, externally rotate slowly
• Positive: Patient shows apprehension/fear (not just pain) that shoulder will dislocate anteriorly

Relocation Test (Jobe's Relocation Test)

• Same as apprehension test, then push humeral head posteriorly (reduce it)
• Positive (relocation): Apprehension disappears when head is pushed back = anterior instability confirmed

Speed's Test (Biceps Long Head / SLAP)

• Shoulder flexed 90°, elbow extended, forearm supinated
• Patient resists downward force
• Positive: Pain in bicipital groove = biceps tendinitis or SLAP lesion

Yergason's Test (Biceps tendon instability)

• Elbow at 90° flexion, forearm pronated, resist supination + ER
• Positive: Biceps tendon pops out of groove or pain in bicipital groove

Sulcus Sign (Inferior Instability)

• Apply downward traction on the arm while patient seated
• Positive: A visible sulcus (depression) below acromion
• Indicates inferior glenohumeral instability / MDI (multidirectional instability)

---

Elbow Special Tests

Cozen's Test / Mill's Test (Lateral Epicondylitis - Tennis Elbow)

• Cozen's: Resist wrist extension with elbow in extension → pain at lateral epicondyle
• Mill's: Passive stretch - pronate forearm, flex wrist, extend elbow → pain at lateral epicondyle

Golfer's Elbow Test (Medial Epicondylitis)

• Resist wrist flexion with elbow in extension → pain at medial epicondyle

Tinel's Sign at Elbow (Ulnar Nerve)

• Tap over cubital tunnel (medial epicondyle groove)
• Positive: Tingling/electric sensation in ring and little finger (ulnar nerve distribution)

---

Wrist & Hand Special Tests

Finkelstein's Test (De Quervain's Tenosynovitis)

• Thumb tucked in fist, deviate wrist ulnarly
• Positive: Sharp pain over radial styloid / first dorsal compartment (APL + EPB tendons)

Phalen's Test (Carpal Tunnel Syndrome)

• Hold both wrists in maximum flexion (dorsum to dorsum) for 60 seconds
• Positive: Tingling/numbness in median nerve distribution (thumb, index, middle, radial half of ring finger)

Reverse Phalen's (Prayer Sign)

• Maximum wrist extension held for 60 seconds
• Tests dorsal wrist structures

Tinel's at Wrist (Carpal Tunnel)

• Tap over carpal tunnel (flexor retinaculum)
• Positive: Tingling in median nerve distribution

Allen's Test (Vascular - Radial/Ulnar Artery)

• Occlude both arteries, patient opens and closes fist to blank the hand
• Release one artery → hand should refill in 3-5 seconds
• Positive (abnormal): Hand does not refill = that artery is occluded

---

Spine Special Tests

Spurling's Test (Cervical Radiculopathy)

• Neck extended + laterally flexed + axially compressed toward symptomatic side
• Positive: Radiating pain/paresthesia down the arm in a dermatomal pattern
• Indicates nerve root compression (foraminal narrowing)

Distraction Test (Cervical - relieves symptoms)

• Manual traction applied to head
• Positive: Radiating symptoms REDUCE = confirms nerve root compression (not myelopathy)

Vertebral Artery Test (VBI Screen)

• Neck extended and rotated to one side, hold for 30 seconds
• Positive: dizziness, nystagmus, drop attack = vertebral artery compromise
• Must be done before cervical manipulation

Straight Leg Raise (SLR) / Lasegue's Test (L4-S1 Nerve Root)

• Patient supine, knee straight, hip flexed passively
• Positive: Radicular pain radiating down leg below knee at 30-70° hip flexion
• Pain only in back (not radiating) is NOT positive
• At 70°: sciatic nerve is maximally tensioned

Well-Leg SLR (Crossed SLR)

• Raise the UNAFFECTED leg and pain radiates to the AFFECTED leg
• High specificity for large central/paracentral disc herniation

Femoral Nerve Stretch Test (L2-L4 Nerve Root)

• Patient prone, flex knee passively (or extend hip)
• Positive: Anterior thigh pain radiating down = femoral nerve tension = upper lumbar disc (L2-3, L3-4)

Slump Test (Thoracolumbar / Sciatic Tension)

• Patient seated, slump trunk forward, flex neck, extend knee, dorsiflex ankle
• Positive: Sciatic pain reproduced; symptoms relieved when neck is released

Kemp's Test (Facet Joint / Lumbar Foraminal Compression)

• Standing, extend + rotate + laterally flex spine toward symptomatic side
• Positive: Local or referred pain = facet joint irritation or foraminal stenosis

FABER Test (Patrick's Test) - Hip/SIJ

• Flexion + ABduction + External Rotation of hip ("figure 4 position")
• Positive: Pain in groin = hip joint pathology; Pain in posterior SIJ region = SIJ pathology

FADIR Test (Hip Impingement)

• Flexion + ADduction + Internal Rotation of hip
• Positive: Anterior groin pain = femoroacetabular impingement (FAI) or anterior labral tear

---

Knee Special Tests

Valgus Stress Test (MCL)

• Knee at 0° (tests posterior oblique + MCL) and 30° flexion (tests MCL specifically)
• Apply valgus force (push knee inward, foot outward)
• Positive: Joint gap opens = MCL tear

Varus Stress Test (LCL)

• Apply varus force at 0° and 30°
• Positive: Lateral joint gap opens = LCL tear

Lachman's Test (ACL - Most Sensitive Test for ACL)

• Knee at 20-30° flexion; one hand stabilizes femur, other hand pulls tibia anteriorly
• Positive: Excessive anterior translation + soft/absent endpoint = ACL tear
• Most sensitive test for ACL (more than Anterior Drawer)

Anterior Drawer Test (ACL)

• Knee at 90° flexion; feet stabilized; pull tibia anteriorly
• Positive: Excessive anterior translation
• Less sensitive than Lachman's (hamstrings can splint the knee at 90°)

Posterior Drawer Test (PCL)

• Same position as anterior drawer but push tibia posteriorly
• Positive: Excessive posterior sag or translation = PCL tear

Posterior Sag Sign (PCL)

• Patient supine, hips and knees at 90°
• Positive: Tibia sags posteriorly under gravity (compared to other side) = PCL tear

McMurray's Test (Meniscus)

• Knee fully flexed; apply valgus + ER while extending = tests medial meniscus
• Apply varus + IR while extending = tests lateral meniscus
• Positive: Click or clunk + pain at joint line = meniscus tear

Thessaly Test (Meniscus - most sensitive)

• Patient stands on affected leg, slight knee flexion (20°), rotates medially and laterally
• Positive: Joint line discomfort or locking sensation = meniscus tear

Apley's Grind Test (Meniscus vs. Ligament)

• Prone, knee 90°; compress (grind) + rotate → meniscus pain
• Distract + rotate → ligament pain

Clarke's Test (Patellofemoral Syndrome)

• Push patella distally while patient contracts quad
• Positive: Pain under patella = chondromalacia patella / patellofemoral syndrome

Patellar Apprehension Test (Patellar Dislocation)

• Push patella laterally
• Positive: Apprehension (patient grabs examiner's hand in fear of dislocation)

Ballottement / Bulge Sign (Joint Effusion)

• Ballottement: Compress suprapatellar pouch, tap patella → "bounce" of patella = large effusion
• Bulge sign: Stroke medial side of knee upward, then stroke lateral side down → a bulge appears medially = small effusion (50-100 mL)

---

Hip Special Tests

Thomas Test (Hip Flexor Contracture)

• Patient supine, bring both knees to chest (flattens lumbar spine)
• Lower one leg slowly
• Positive: The leg does not reach the table (remains elevated) = hip flexor contracture (iliopsoas tightness)

Ober's Test (IT Band / TFL Tightness)

• Patient side-lying (affected side up), hip extended + abducted (knee straight or bent)
• Allow limb to adduct passively
• Positive: Limb remains elevated (does not adduct to neutral) = IT band / TFL tightness

Trendelenburg Test (Gluteus Medius Weakness)

• Patient stands on affected leg
• Positive: Pelvis drops on the opposite (unaffected) side = weak gluteus medius on the stance side
• The body may compensate by leaning toward the weak side (compensated Trendelenburg)

FABER and FADIR (covered above under spine section)

Ortolani Test (Developmental Dysplasia of Hip - DDH, in infants)

• Gently abduct hips while applying anterior pressure
• Positive: A "clunk" as dislocated femoral head reduces back into acetabulum = DDH

Barlow Test (DDH - in infants)

• Adduct and push femoral head posteriorly
• Positive: Hip dislocates = unstable hip

---

TOPIC 3: COMMON ORTHOPEDIC CONDITIONS & PHYSIOTHERAPY MANAGEMENT

3A: Shoulder Conditions

Rotator Cuff Tear

• 4 rotator cuff muscles: SITS = Supraspinatus, Infraspinatus, Teres minor, Subscapularis
• Supraspinatus is most commonly torn (compressed in subacromial space)
• Mechanism: degeneration (>40 years), acute trauma (fall on outstretched hand)
• Presentation: pain on abduction (painful arc 60-120°), weakness in ER, drop arm sign positive
• Physiotherapy: Rotator cuff strengthening (especially ER and scapular stabilizers), posterior capsule stretching, postural correction, avoid overhead activities initially

Frozen Shoulder (Adhesive Capsulitis)

• Global loss of shoulder ROM, especially ER > abduction > IR (capsular pattern)
• Three stages:
  1. Freezing phase: Gradual onset of pain, ROM starts reducing (2-9 months)
  2. Frozen phase: Pain may lessen but ROM severely restricted (4-12 months)
  3. Thawing phase: Gradual spontaneous recovery of ROM (5-26 months)
• Physiotherapy: Joint mobilization (Grade III-IV), stretching (posterior capsule stretch, sleeper stretch), codman's exercises, TENS for pain, heat before treatment
• Commonly associated with: Diabetes mellitus, hypothyroidism, post-surgery, Dupuytren's

Shoulder Impingement Syndrome

• Supraspinatus tendon compressed between humeral head and coracoacromial arch
• Painful arc: Pain from 60-120° of abduction
• Neer and Hawkins tests positive
• Physiotherapy: Rotator cuff strengthening (ER > IR), lower trapezius + serratus anterior exercises, posterior capsule stretch, avoid impingement positions, corticosteroid injection if needed

---

3B: Elbow Conditions

Lateral Epicondylitis (Tennis Elbow)

• Most common overuse injury of the elbow
• Structure involved: Extensor carpi radialis brevis (ECRB) tendinopathy at lateral epicondyle
• Mechanism: Repetitive wrist extension and gripping (tennis, computer use, manual work)
• Cozen's and Mill's tests positive
• Physiotherapy:
  • Relative rest, avoid provoking activities
  • Eccentric wrist extension exercises (Nirschl protocol) - gold standard
  • Friction massage (Cyriax deep transverse friction massage) to ECRB origin
  • Heat/ice, TENS, ultrasound, laser
  • Tennis elbow brace (counterforce strap) just distal to lateral epicondyle
  • Stretching wrist extensors

Medial Epicondylitis (Golfer's Elbow)

• Flexor-pronator mass tendinopathy at medial epicondyle
• Pain on resisted wrist flexion and pronation
• Less common than lateral epicondylitis

---

3C: Wrist & Hand Conditions

Carpal Tunnel Syndrome (CTS)

• Compression of median nerve within the carpal tunnel (bounded by carpal bones posteriorly and flexor retinaculum anteriorly)
• Causes: repetitive flexion/extension, pregnancy, hypothyroidism, RA, acromegaly, diabetes, ganglion
• Symptoms: Nocturnal paresthesia in thumb/index/middle finger, thenar wasting (late)
• Tests: Phalen's positive, Tinel's positive at wrist
• Physiotherapy: Neural mobilization (median nerve glides), wrist splint in neutral (especially at night), activity modification, ultrasound to carpal tunnel area
• Surgical: Decompression of flexor retinaculum (carpal tunnel release)

De Quervain's Tenosynovitis

• Inflammation of APL (Abductor pollicis longus) and EPB (Extensor pollicis brevis) in the first dorsal compartment of wrist
• Pain over radial styloid with thumb movement
• Finkelstein's test positive
• Physiotherapy: Thumb spica splint, ice/ultrasound, friction massage, activity modification

---

3D: Spinal Conditions

Disc Prolapse (PIVD - Prolapsed Intervertebral Disc)

• Nucleus pulposus herniates through annulus fibrosus
• Types: Bulge, protrusion, extrusion, sequestration (in order of severity)
• Posterolateral herniation most common (compresses nerve root)
• L4-L5 disc: compresses L5 nerve root → weak ankle dorsiflexion, numbness between 1st and 2nd toes
• L5-S1 disc: compresses S1 nerve root → weak plantarflexion, loss of ankle jerk, numbness lateral foot
• SLR positive, crossed SLR positive for large herniations

• C5-C6 disc → C6 root compression → biceps jerk reduced, numbness thumb/index
• C6-C7 disc → C7 root compression → triceps jerk reduced, numbness middle finger

• McKenzie extension protocol (for posterior herniations - centralizes symptoms)
• Williams flexion exercises (for disc degeneration / facet joint pain)
• Traction (lumbar and cervical) - unloads disc
• Core stability exercises (multifidus, transversus abdominis)
• TENS, ultrasound, heat/cold for pain
• Postural education, ergonomic advice

Spondylosis (Degenerative Disc Disease)

• Age-related degeneration of IVD: loss of water content → disc space narrows → osteophytes form
• Causes stiffness, pain, possible nerve root compression
• Physiotherapy: posture correction, flexibility + strengthening exercises, traction, manual therapy

Spondylolisthesis

• Forward slip of one vertebra on the vertebra below
• Most common: L4 slips forward on L5, or L5 on S1
• Grading (Meyerding):
  • Grade I: <25% slip
  • Grade II: 25-50%
  • Grade III: 50-75%
  • Grade IV: 75-100%
  • Grade V (Spondyloptosis): >100% (vertebra falls off completely)
• Types: Dysplastic, Isthmic (stress fracture of pars = most common in young athletes), Degenerative, Traumatic, Pathological
• Physiotherapy: Core stability (flexion bias exercises), hamstring stretching, avoid hyperextension activities

Cervical Spondylosis

• Degenerative changes in cervical spine: disc degeneration, osteophytes, facet joint arthritis
• Can cause: neck pain, radiculopathy (nerve root compression), myelopathy (spinal cord compression - serious)
• Physiotherapy: cervical traction, mobilization, isometric neck strengthening, posture correction, soft cervical collar (short term only)

Spinal Stenosis

• Narrowing of the spinal canal compressing the spinal cord or cauda equina
• Neurogenic claudication: bilateral leg pain/weakness on walking, relieved by sitting or forward flexion (classic feature)
• Unlike vascular claudication: NOT relieved by standing still; relieved by sitting/bending forward (increases canal diameter)
• Physiotherapy: flexion bias exercises (Williams), stationary cycling (flexed posture), avoid extension, core stability

---

3E: Hip Conditions

Osteoarthritis (OA) of Hip

• Degeneration of articular cartilage: loss of joint space, subchondral sclerosis, osteophytes, cysts
• Capsular pattern: IR > Flexion > Abduction most limited
• FABER positive, FADIR positive
• Thomas test may be positive (hip flexor contracture)
• Trendelenburg sign positive (gluteus medius weakness)
• Physiotherapy: Hip strengthening (esp. abductors, extensors), flexibility exercises, hydrotherapy, gait training, assistive device, weight reduction, pain management (TENS, heat, ultrasound)
• Surgical: Total Hip Replacement (THR) / Total Hip Arthroplasty (THA)

Total Hip Replacement (THR) Physiotherapy

• No hip flexion beyond 90°
• No adduction beyond neutral (crossing legs)
• No IR (turning foot inward)
• "Hip precautions" to prevent dislocation
• (These precautions are less strict with anterior approach)

• Day 1: Ankle pumps, deep breathing, bed exercises, sitting at edge of bed
• Day 2-3: Standing with walker, NWB → PWB depending on fixation
• Weeks 2-6: Progressive weight-bearing, gait training, hip strengthening
• Weeks 6-12: Swimming, cycling (low impact)
• 3-6 months: Return to normal activities

---

3F: Knee Conditions

Osteoarthritis (OA) of Knee

• Most common joint affected by OA
• Medial compartment most affected → varus deformity (bow-legged)
• X-ray: Joint space narrowing, subchondral sclerosis, osteophyte formation, subchondral cysts
• Physiotherapy: Quad strengthening (VMO especially), hip abductor strengthening, patellar taping (McConnell), hydrotherapy, weight reduction, assistive device (medial heel wedge for lateral OA), TENS/heat
• Surgical: Total Knee Replacement (TKR / TKA)

Total Knee Replacement (TKR) Physiotherapy

• Day 1: Quad sets, ankle pumps, knee extension to 0°
• Day 2-3: Standing, gait training (walker), straight leg raises
• 2 weeks: Knee flexion to 90° target
• 6 weeks: Knee flexion to 110-120°
• Key outcome measure: ROM (extension to 0°, flexion to 110°) and quadriceps strength
• CPM (Continuous Passive Motion) machine: early ROM maintenance (controversial)

ACL (Anterior Cruciate Ligament) Injury

• Phase 1 (0-2 weeks): Pain/swelling control, full knee extension, quad activation (quad sets, SLR), patellar mobilization, partial weight-bearing
• Phase 2 (2-6 weeks): Full weight-bearing, ROM 0-90°+, closed chain exercises (mini squats, leg press), hamstring strengthening, cycling
• Phase 3 (6-12 weeks): Proprioception + neuromuscular training, sport-specific activities start, running on straight
• Phase 4 (3-6 months): Plyometrics, agility drills, sport-specific training
• Return to sport: Usually 9-12 months; requires clearance tests (limb symmetry index >90%)

Meniscus Injury

• Medial meniscus more commonly injured (less mobile, attached to MCL)
• Mechanism: Twisting with knee flexed + weight bearing
• Presentation: Joint line pain, locking (bucket handle tear), effusion, giving way
• Tests: McMurray positive, Thessaly test (most sensitive)
• Management:
  • Conservative: RICE, physiotherapy (quad strengthening, proprioception) for partial tears or degenerative tears
  • Surgical: Arthroscopic meniscectomy (partial) or meniscus repair (for peripheral tears - vascular zone)

Chondromalacia Patellae (Patellofemoral Syndrome)

• Softening and degeneration of patellar articular cartilage
• Pain behind/around patella, worse on stairs, squatting, prolonged sitting (cinema sign / theatre sign)
• Clarke's test positive
• Physiotherapy: VMO strengthening, McConnell patellar taping (medial glide), stretching IT band + quads + hamstrings, avoid deep flexion initially, orthotics for pronated foot

---

3G: Ankle & Foot Conditions

Ankle Sprain (Lateral - Most Common)

• Mechanism: Inversion + plantarflexion
• Ligaments: ATFL (anterior talofibular) torn first → CFL (calcaneofibular) → PTFL (posterior talofibular)
• Grading:
  • Grade I: Microscopic tears, mild pain, no instability
  • Grade II: Partial tear, moderate pain, some instability
  • Grade III: Complete tear, significant instability, major bruising
• OTTAWA Ankle Rules (for deciding when to X-ray after ankle injury):
  • Pain in malleolar zone + bone tenderness at posterior edge/tip of either malleolus
  • OR inability to weight-bear for 4 steps → X-ray required
• Physiotherapy: PRICE (acute), early weight-bearing, ROM exercises (ankle alphabets), proprioception training (wobble board), peroneal strengthening, taping/bracing for return to sport

Plantar Fasciitis

• Inflammation/degeneration of plantar fascia at its calcaneal attachment
• Classic symptom: Pain at the bottom of the heel, worst with first steps in the morning (post-static dyskinesia)
• Improves after walking a few steps (tissue warms up), worsens again after prolonged walking
• Physiotherapy: Plantar fascia stretching (pull toes back), calf stretching (Achilles + gastrocnemius), intrinsic foot muscle strengthening, night splints (maintain dorsiflexion overnight), heel cups/orthoses, ESWT (Extracorporeal Shock Wave Therapy - if conservative fails)

Achilles Tendinopathy

• Insertional or non-insertional (mid-portion, 2-6 cm above insertion)
• Cause: overuse, sudden increase in training load
• Alfredson's Protocol (eccentric heel drops): Gold standard treatment
  • Standing on step edge, rise on both feet, lower on affected foot only (eccentric load)
  • 3 sets × 15 reps × 2 times daily for 12 weeks (even if painful)

Osgood-Schlatter Disease

• Traction apophysitis at tibial tuberosity (where patellar tendon inserts)
• Adolescent boys (10-15 years) during growth spurt
• Presentation: Pain and swelling at tibial tuberosity, worse with activity
• Physiotherapy: Relative rest, quad stretching, ice, patellar tendon strap

Calcaneal Spur

• Bony outgrowth (osteophyte) at the inferior calcaneus
• Often associated with plantar fasciitis (though the spur itself may be painless)
• Physiotherapy: Similar to plantar fasciitis management + heel cups

---

TOPIC 4: ORTHOPEDIC SURGERIES & PHYSIOTHERAPY

Fracture Fixation Methods

Conservative Management

• POP (Plaster of Paris) cast: Immobilization; physiotherapy = adjacent joint exercises + isometrics inside cast
• Traction: Skin traction (light loads, pediatric) vs. Skeletal traction (pins through bone, e.g., tibial pin for femur fracture)

Surgical Fixation

• ORIF (Open Reduction Internal Fixation): Fracture opened, reduced, fixed with plates, screws, nails
• CRIF (Closed Reduction Internal Fixation): Reduction under image intensifier, minimal incision, K-wires or IM nail
• IM Nail (Intramedullary Nail): Nail inside medullary canal (tibia, femur, humerus) - allows early weight bearing
• External Fixator (Ex-Fix): Pins through bone connected to external frame - used for open fractures, poly-trauma, Ilizarov for leg lengthening

---

Amputations & Prosthetics

Levels of Lower Limb Amputation

• Below knee (BKA) / Transtibial: Ideal stump length = 12-15 cm below knee joint
• Above knee (AKA) / Transfemoral: Ideal stump = 50-60% of femoral length
• Syme's amputation: Through ankle joint (disarticulation)
• Hip disarticulation: Through hip joint
• Hemipelvectomy: Half pelvis removed

Physiotherapy After Amputation

• Residual limb shaping: stump bandaging (figure-of-8 pattern, distal to proximal) or stump shrinker sock
• Prevent contractures: BKA - avoid knee flexion contracture; AKA - avoid hip flexion/abduction contracture
• Strengthening: upper limbs, core, residual limb muscles
• Balance training with temporary prosthesis
• Desensitization of stump (tapping, rubbing)

• Donning/doffing the prosthesis
• Weight bearing, balance
• Gait training: heel strike to toe off with prosthesis
• Stair climbing, slopes, uneven terrain

• Phantom limb pain: Sensation or pain in the amputated limb; management = mirror therapy, TENS, desensitization
• Residual limb pain, skin breakdown, contractures

---

TOPIC 5: DERMATOMES, MYOTOMES & NERVE ROOT LESIONS

Cervical Nerve Roots

Lumbar Nerve Roots

• Bilateral leg weakness, saddle anesthesia, loss of bladder/bowel control
• Surgical emergency - decompress within 24-48 hours

---

Peripheral Nerve Injuries

Upper Limb

• Injury at axilla: Saturday night palsy (crutch palsy) / posterior cord lesion
• Wrist drop (loss of wrist extension)
• Loss of sensation: dorsum of hand (anatomical snuffbox area)
• Injury at spiral groove of humerus: same but triceps spared

• High lesion (above elbow): Benediction hand (cannot flex index/middle finger)
• Carpal tunnel syndrome: Low lesion - thenar wasting, loss of opposition, sensory loss in thumb/index/middle/radial ring
• Pope's blessing / Orator's hand: pointing index when asked to make a fist (high median nerve lesion)
• Ape hand deformity: Thenar wasting + inability to abduct/oppose thumb (chronic CTS or high median nerve lesion)

• Injury at elbow (cubital tunnel) or wrist
• Claw hand deformity: Ring + little finger clawed (MCP extended, IP flexed) due to intrinsic paralysis
• Ulnar paradox: High lesion causes LESS clawing than low lesion (FDP cuts out in high lesion)
• Loss of sensation: Little finger + medial ring finger
• Froment's sign: Ask patient to hold paper between thumb and index finger; they use FPL (median nerve) instead of adductor pollicis = positive = ulnar nerve palsy
• Weakness: all intrinsic hand muscles except LOAF (Lumbricals 1&2, Opponens pollicis, Abductor pollicis brevis, Flexor pollicis brevis = median nerve)

Lower Limb

• Winds around neck of fibula - easily injured by fracture, tight plaster cast, crossing legs
• Foot drop: Loss of dorsiflexion + eversion
• Steppage gait (high-stepping to clear foot)
• Loss of sensation: dorsum of foot

• Injury: Loss of plantarflexion + inversion
• Tarsal tunnel syndrome (compression under flexor retinaculum at ankle)

• Loss of knee extension (quadriceps), hip flexion
• Loss of knee jerk reflex

---

TOPIC 6: BONE DISEASES & METABOLIC CONDITIONS

Osteoporosis

• Reduced bone mass + microarchitectural deterioration → increased fracture risk
• T-score on DEXA scan:
  • Normal: T-score > -1.0
  • Osteopenia: T-score -1.0 to -2.5
  • Osteoporosis: T-score ≤ -2.5
  • Severe osteoporosis: T-score ≤ -2.5 + fragility fracture
• Common fracture sites: Colles' fracture (wrist), vertebral compression fractures, neck of femur (most devastating)
• Physiotherapy: Weight-bearing exercises (walking, jogging), resistance training, balance training (fall prevention), posture correction, avoid high-impact + flexion loading of spine

Osteomalacia & Rickets

• Osteomalacia (adults) / Rickets (children): Inadequate mineralization of bone due to Vitamin D deficiency
• Rickets signs: bowlegs (genu varum), rachitic rosary (rib beading), craniotabes, widened epiphyses

Paget's Disease (Osteitis Deformans)

• Accelerated and disorganized bone remodeling
• Bones enlarge and deform: bowing of femur and tibia ("saber shin"), enlarged skull, kyphosis
• Raised Alkaline Phosphatase (ALP) - key lab marker
• Complications: pathological fractures, secondary OA, deafness (skull base), osteosarcoma (rare)

Osteomyelitis

• Infection of bone (usually Staphylococcus aureus - most common cause)
• Hematogenous spread in children (metaphysis most affected - good blood supply)
• Signs: fever, localized bone pain, swelling, raised ESR, CRP, WBC
• X-ray changes take 10-14 days to appear; MRI is early investigation of choice

Septic Arthritis

• Joint infection (most common: Staph aureus)
• Hot, red, swollen, exquisitely painful joint; loss of all movements (spasm)
• Medical emergency: requires aspiration + IV antibiotics + drainage
• Physiotherapy: After acute phase - gradual ROM restoration, strengthening

---

TOPIC 7: SOFT TISSUE INJURIES & ORTHOPEDIC CONDITIONS

Muscle Injuries

Muscle Strain (Tear) Grading

• Grade I: Minor tear (<5% fibers), mild pain, no significant loss of strength, full ROM
• Grade II: Partial tear (5-50%), moderate pain, some loss of strength, tenderness
• Grade III: Complete tear (>50% or complete), significant loss of strength, possible palpable defect

Hamstring Strain (most common muscle injury in sport)

• Mechanism: Explosive sprint (eccentric overload)
• Most common at musculotendinous junction of biceps femoris (long head)
• Physiotherapy: Acute - PRICE; Subacute - eccentric strengthening (Nordic curl), flexibility
• Nordic curl: Eccentric hamstring exercise - knee start to end position while resisting fall forward

Ligament Sprain Grading

• Same Grade I/II/III classification as muscle strains

Tendinopathy vs. Tendinitis vs. Tendinosis

• Tendinitis: Acute inflammatory process (early stage)
• Tendinosis: Chronic, degenerative changes without inflammation (collagen breakdown)
• Tendinopathy: Umbrella term for all clinical tendon disorders
• Management: Eccentric exercise is the treatment of choice for tendinopathy

---

TOPIC 8: PEDIATRIC ORTHOPEDICS

Developmental Dysplasia of Hip (DDH)

• Spectrum from shallow acetabulum to complete dislocation
• Risk factors: Female, first-born, breech presentation, family history
• Diagnosis in infants: Ortolani (reduction clunk) and Barlow (dislocation) tests
• Older child: Trendelenburg sign, Galeazzi sign (one knee higher in supine hip/knee flexion = shorter femur = dysplastic hip)
• Treatment: Pavlik harness (< 6 months), closed/open reduction + casting (older infants)

Perthes Disease (Legg-Calvé-Perthes)

• Avascular necrosis of the femoral head in children (ages 4-8 years, males > females)
• Idiopathic disruption of blood supply to femoral head
• Stages: Avascular necrosis → Fragmentation → Re-ossification → Remodeling (Waldenstrom's stages)
• Presentation: Painless limp, hip pain referred to knee, limited IR and abduction
• Physiotherapy: Maintain ROM (abduction and IR), containment of femoral head (abduction splint or surgery)

Club Foot (Talipes Equinovarus - CTEV)

• CAVE deformity (mnemonic): Cavus, Adductus (forefoot), Varus (heel), Equinus (ankle)
• Congenital, treated immediately at birth
• Ponseti Method (gold standard): Serial casting weekly (corrects CAVE in order: Cavus → Adductus → Varus → Equinus) + Achilles tendon tenotomy + Dennis-Brown boots (foot abduction orthosis)

Osgood-Schlatter Disease (covered above in knee section)

Scoliosis (Adolescent Idiopathic Scoliosis - AIS)

• Lateral curvature with rotation, in adolescents (girls > boys)
• Cobb's angle measurement on X-ray
• Treatment guidelines:
  • < 20°: Observation
  • 20-40°: Bracing (Milwaukee brace, Boston brace, TLSO)

  • 45-50°: Surgery (spinal fusion)

---

TOPIC 9: RHEUMATOLOGICAL CONDITIONS

Rheumatoid Arthritis (RA)

• Chronic autoimmune synovitis (inflammation of synovium)
• Affects multiple joints symmetrically
• Characteristic deformities:
  • Swan neck deformity: PIP hyperextension + DIP flexion
  • Boutonnière deformity: PIP flexion + DIP hyperextension
  • Z-deformity (thumb): MCP flexion + IP hyperextension
  • Ulnar drift at MCPs
  • Hammer toe
• Lab markers: Rheumatoid Factor (RF), Anti-CCP (most specific), raised ESR/CRP
• X-ray: Periarticular osteoporosis → joint space narrowing → erosions → ankylosis
• Extra-articular features: rheumatoid nodules, anemia, vasculitis, pleuritis, pericarditis, Sjögren's
• Physiotherapy (acute flare): Rest, ice, gentle ROM (to prevent contracture), splinting (resting splint at night)
• Physiotherapy (chronic): Strengthening, ADL training, joint protection principles, assistive devices, hydrotherapy, aerobic exercise

• Respect pain
• Avoid tight grip
• Avoid ulnar deviation forces (use palm not fingers)
• Distribute load over largest joint
• Maintain joint mobility and muscle strength
• Maintain good posture

Ankylosing Spondylitis (AS)

• HLA-B27 positive (>90% of cases)
• Chronic inflammatory arthritis of sacroiliac joints and spine → progressive ankylosis (fusion)
• Young males (onset 15-35 years)
• Presentation: Inflammatory low back pain: morning stiffness > 1 hour, improves with exercise (NOT with rest - opposite of mechanical pain), insidious onset < 40 years
• Classic sign: Bamboo spine on X-ray (syndesmophytes fusing vertebrae)
• Schober's test: <5 cm increase in lumbar flexion distance (from S2 to 10 cm above) = reduced lumbar mobility
• Physiotherapy: The MOST IMPORTANT INTERVENTION for AS
  • Deep breathing exercises (prevent thoracic kyphosis + maintain chest expansion)
  • Spinal extension exercises (counteract the flexion deformity tendency)
  • Prone lying (maintain lumbar extension)
  • Swimming (best sport - axial unloading + breathing exercise)
  • Maintain good posture (firm mattress, no pillow or flat pillow)
  • Hip and shoulder mobilization

Gout

• Uric acid crystals (monosodium urate, MSU) deposit in joints
• Causes: hyperuricemia, high-purine diet, alcohol, thiazide diuretics
• First MTP joint (big toe) most commonly affected = Podagra
• Acute attack: red, hot, swollen, exquisitely tender joint
• Diagnosis: Joint aspiration - needle-shaped, negatively birefringent crystals
• Chronic gout: Tophi (deposits in soft tissue - helix of ear, Achilles tendon, olecranon)
• Management: Acute = NSAIDs, colchicine; Chronic = allopurinol (reduces uric acid production)

---

TOPIC 10: ORTHOPEDIC ASSESSMENT TOOLS & OUTCOME MEASURES

Functional Outcome Measures (Frequently Tested)

---

TOPIC 11: ORTHOTICS & PROSTHETICS

Orthoses - Upper Limb

• Resting hand splint: Position of rest (wrist extension 30°, MCP flexion 45°, IP slight flexion, thumb abduction) - used in RA, burns, neurological conditions
• Cock-up splint (wrist cock-up): Wrist extension splint for CTS (worn at night), radial nerve palsy (wrist drop)
• Thumb spica: Immobilizes thumb CMC + MCP - De Quervain's, Bennett's fracture
• Dynamic splint (outrigger): Spring-loaded, maintains passive stretch - burns, post-surgery contractures

Orthoses - Lower Limb

• AFO (Ankle Foot Orthosis): Controls ankle/foot; used for foot drop (holds ankle at 90°), stroke, CP
  • Types: Rigid, hinged (allows dorsiflexion), leaf spring (mild foot drop)
• KAFO (Knee Ankle Foot Orthosis): Controls knee + ankle; used for quadriceps weakness, polio
• HKAFO (Hip Knee Ankle Foot Orthosis): Used for high spinal cord injuries

Spinal Orthoses

---

TOPIC 12: FRACTURE-SPECIFIC HIGH-YIELD FACTS

Colles' Fracture

• Dinner fork deformity (dorsal displacement of distal fragment)
• Site: Distal radius, 2.5 cm proximal to radio-carpal joint
• Mechanism: Fall on outstretched hand (FOOSH) in dorsiflexion
• Common in post-menopausal women (osteoporosis)
• Features: Dorsal displacement + tilt, radial shortening, supination
• Opposite = Smith's fracture (volar displacement = garden spade deformity) - fall on flexed wrist

Scaphoid Fracture

• Most common carpal bone fracture
• Mechanism: FOOSH (fall on outstretched hand)
• Danger: Waist fractures have poor blood supply (blood supply enters distally) → AVN risk of proximal pole
• Presentation: Tenderness in anatomical snuffbox (between EPL and APL + EPB tendons)
• X-ray initially negative in up to 20% → treat as fracture and repeat X-ray in 10-14 days OR MRI/CT
• Treatment: Thumb scaphoid cast; waist fractures - ORIF with Herbert screw if displaced

Neck of Femur Fracture

• Common in elderly osteoporotic women
• Classification: Garden's Classification (I-IV based on displacement)
  • Garden I: Incomplete/impacted (valgus impacted)
  • Garden II: Complete, undisplaced
  • Garden III: Complete, partial displacement
  • Garden IV: Complete, fully displaced
• Garden I & II: Internal fixation (dynamic hip screw, cannulated screws)
• Garden III & IV: Hemiarthroplasty (Austin-Moore or bipolar) or Total Hip Replacement (active patients)
• AVN risk: Garden III = 25%, Garden IV = 100% displacement = high AVN risk

Monteggia Fracture

• Fracture of proximal ulna + dislocation of radial head
• Mnemonic: Monteggia = MUDRad = fracture of ulna, dislocation of radius

Galeazzi Fracture

• Fracture of distal radius + dislocation of distal radio-ulnar joint (DRUJ)
• Mnemonic: Galeazzi = GRUDR = fracture of radius, dislocation of ulna

Bennett's Fracture

• Intra-articular fracture of base of 1st metacarpal (thumb CMC joint)
• Mechanism: Punch or axial load on thumb
• Treatment: Usually ORIF or K-wire fixation

Segond Fracture

• Avulsion fracture of the lateral tibial rim
• Pathognomonic of ACL tear (lateral capsule avulsion)
• Always check ACL when Segond fracture seen on X-ray

---

QUICK-FIRE REVISION - ORTHOPEDICS

Special Tests - One-Line Summary

• Neer + Hawkins = shoulder impingement
• Empty can = supraspinatus tear
• Drop arm = complete rotator cuff tear
• Apprehension = anterior shoulder dislocation
• Speed's = biceps / SLAP
• Finkelstein = De Quervain's
• Phalen + Tinel at wrist = carpal tunnel (median nerve)
• Spurling = cervical radiculopathy
• SLR positive 30-70° = lumbar disc (L4-S1)
• Lachman (most sensitive) = ACL tear
• McMurray = meniscus
• Thessaly (most sensitive) = meniscus
• FABER = hip / SIJ
• FADIR = FAI (femoroacetabular impingement)
• Thomas = hip flexor contracture
• Ober = IT band tightness
• Trendelenburg = gluteus medius weakness

Nerve Injuries

• Wrist drop = Radial nerve (Saturday night palsy)
• Claw hand (ring + little) = Ulnar nerve
• Ape hand + thenar wasting = Median nerve
• Foot drop = Common peroneal nerve
• Froment's sign = Ulnar nerve palsy

Key Lab Tests

• RA: RF + Anti-CCP (most specific), raised ESR/CRP
• Gout: Uric acid raised, needle-shaped negatively birefringent crystals
• AS: HLA-B27 positive, raised ESR/CRP
• Osteomyelitis: Raised WBC, ESR, CRP; blood culture

Key X-ray Signs

• Bamboo spine = Ankylosing Spondylitis
• Joint space narrowing + osteophytes = OA
• Periarticular erosions + osteoporosis = RA
• Lytic lesion + fracture = Pathological fracture
• Sclerosis + bowing = Paget's disease

Deformity Associations

• Swan neck + Boutonnière = RA
• Dinner fork = Colles' fracture
• Garden spade = Smith's fracture
• Wrist drop = Radial nerve
• Foot drop + steppage gait = Common peroneal nerve

AVN Common Sites

• Scaphoid (waist fracture)
• Femoral head (neck of femur fracture, especially Garden III & IV)
• Talus (neck of talus fracture)
• Lunate (Kienböck disease)
• Navicular (Köhler disease - child)
• 2nd metatarsal head (Freiberg's disease)

Important Numbers

• Spondylolisthesis grades: I = 25%, II = 50%, III = 75%, IV = 100%
• TLSO brace for scoliosis: 20-40° Cobb angle
• Surgery for scoliosis: >45-50°
• T-score ≤ -2.5 = Osteoporosis
• THR precaution: No flexion >90°, no adduction, no IR (posterior approach)
• ACL return to sport: 9-12 months
• SLR positive range: 30-70°

---

---

COMPLETE ELECTROTHERAPY NOTES FOR MPT ENTRANCE

---

TOPIC 1: BASICS OF ELECTRICITY (FOUNDATION)

Fundamental Electrical Terms

Current (I)

• Flow of electrons through a conductor
• Unit: Ampere (A) or milliampere (mA)
• Types:
  • Direct Current (DC): Electrons flow in ONE direction only (unidirectional). Also called Galvanic current
  • Alternating Current (AC): Electrons flow BACK and FORTH (bidirectional) - reverses direction periodically
  • Pulsed Current: Interrupted flow with on/off periods (most used in physiotherapy)

Voltage (V)

• The electrical potential difference (force that drives current)
• Unit: Volt (V)

Resistance (R)

• Opposition to current flow
• Unit: Ohm (Ω)
• Skin has high resistance; body fluids have low resistance
• Wet skin = lower resistance; dry, thick, calloused skin = higher resistance

Ohm's Law

• V = I × R
• Voltage = Current × Resistance
• If resistance is high, you need more voltage to push the same current

Impedance

• Total opposition to AC current flow (includes resistance + reactance)
• Capacitance and inductance of tissue contribute to impedance

Power

• Unit: Watt (W)
• Power = Voltage × Current (P = V × I)

---

Parameters of Pulsed Current (Very Commonly Tested)

Pulse Duration (Pulse Width)

• Time for which current flows in a single pulse
• Unit: microseconds (μs) or milliseconds (ms)
• Short pulses: sensory stimulation only; Long pulses: motor + sensory stimulation

Pulse Frequency (Pulse Rate)

• Number of pulses per second
• Unit: Hertz (Hz) or pulses per second (pps)
• Low frequency: < 1000 Hz; High frequency: > 1000 Hz

Amplitude (Intensity)

• Height of the waveform (magnitude of current or voltage)
• Determines depth of penetration and physiological effect

Ramp Time (Rise Time)

• Time taken for current to reach maximum amplitude
• Slow ramp = gentle muscle stimulation (prevents muscle fatigue)
• Fast ramp = more forceful contraction

Duty Cycle

• Ratio of ON time to total time (ON + OFF)
• Duty cycle = ON time / (ON time + OFF time) × 100%
• 50% duty cycle: equal on and off time

Waveform Types

• Monophasic: Current flows in one direction only (DC or pulsed DC)
• Biphasic: Current flows in both directions - may be symmetrical (equal phases) or asymmetrical
• Polyphasic: Multiple phases (e.g., Russian current)

---

Tissue Response to Electricity

Excitable Tissues

• Nerve and muscle cells have resting membrane potential (~-70 mV for neurons, -90 mV for muscle)
• When electrical stimulus applied: depolarization → action potential → nerve impulse or muscle contraction
• Chronaxie: The minimum pulse duration needed to stimulate tissue at TWICE the rheobase intensity
• Rheobase: The minimum current intensity needed to stimulate tissue with an infinitely long pulse duration
• Strength-Duration (S-D) Curve: Graph of rheobase vs. chronaxie - used to assess nerve/muscle excitability
  • Normal nerve: chronaxie < 1 ms
  • Denervated muscle: chronaxie > 10 ms (needs longer pulse)
  • SD curve shifts to the right in denervation

Iontophoresis Principle

• DC current drives ions into tissue (positive ions from anode, negative ions from cathode)
• Drugs delivered this way: dexamethasone (anti-inflammatory), lidocaine (anesthetic), acetic acid (calcium deposits)

---

TOPIC 2: TRANSCUTANEOUS ELECTRICAL NERVE STIMULATION (TENS)

Definition

---

Types of TENS

Conventional TENS (High-Frequency TENS)

• Frequency: 80-150 Hz (high)
• Pulse duration: 10-80 μs (short)
• Intensity: Sensory level - strong tingling, NO muscle contraction
• Onset of pain relief: Fast (minutes)
• Duration of relief: Short (lasts only while machine is on)
• Mechanism: Gate Control Theory (Melzack and Wall, 1965)
  • Stimulates large-diameter Aβ fibers (touch/pressure) in the dorsal horn
  • Aβ fiber activity activates interneurons that CLOSE the gate in substantia gelatinosa
  • Blocks transmission of pain signals from small-diameter Aδ and C fibers
  • NO endorphin release
• Best for: Acute pain, constant pain, pain during physiotherapy

Acupuncture-Like TENS (Low-Frequency TENS / AL-TENS)

• Frequency: 1-4 Hz (low)
• Pulse duration: 100-400 μs (long)
• Intensity: Motor level - visible muscle twitching (like acupuncture)
• Onset: Slow (20-30 minutes to take effect)
• Duration of relief: Longer (outlasts the treatment session)
• Mechanism: Endogenous opioid release (endorphins, enkephalins, dynorphins)
  • Stimulates Aδ fibers → descending pain inhibitory pathways → opioid release in brainstem (PAG - periaqueductal gray)
  • Blocked by naloxone (opioid antagonist) - confirms opioid mechanism
• Best for: Chronic pain, trigger points, acupuncture points

Burst Mode TENS

• High-frequency bursts (e.g., 100 Hz) delivered at a low burst frequency (2-4 bursts/second)
• Combines mechanisms of both conventional and AL-TENS
• Produces rhythmic muscle twitching (more tolerable than AL-TENS)
• Some endorphin release

Brief Intense TENS

• Very high frequency (150 Hz) + very long pulse duration (250 μs)
• Maximum intensity just below painful threshold
• Used for: brief painful procedures (wound dressing, joint mobilization)
• Very short duration of use (15 minutes maximum)

---

Gate Control Theory (Melzack and Wall, 1965)

• "Gate" is in the substantia gelatinosa of the dorsal horn of spinal cord
• Small fiber (Aδ, C) activity: Opens the gate → pain transmitted to higher centers
• Large fiber (Aβ) activity: Closes the gate → pain transmission blocked
• TENS, massage, and pressure work by activating Aβ fibers to close the gate
• T cell (transmission cell) in dorsal horn transmits pain to thalamus when gate is open

---

TENS Parameters Summary Table

---

Electrode Placement for TENS

• Over or adjacent to the painful area (most common)
• Over the nerve supplying the area
• At dermatomal level
• Acupuncture points / trigger points (for AL-TENS)
• Contralateral mirror image (in stump pain, hypersensitive areas)

Contraindications of TENS

• Over anterior neck / carotid sinus (risk of reflex hypotension, laryngospasm)
• Over eyes
• Transcerebrally (across the head)
• Transthoracically (across the chest - cardiac interference)
• Pacemaker / demand-type cardiac device
• Over malignancy (may promote cell proliferation)
• Pregnancy (first trimester) - over abdomen/lower back
• Epilepsy (transcranial use)
• Skin breakdown, open wounds (relative), dermatitis at electrode site
• Confusion / inability to report pain

---

TOPIC 3: INTERFERENTIAL THERAPY (IFT)

Principle

• Two medium-frequency currents (around 4000 Hz) applied simultaneously through the body
• The two circuits intersect (interfere) inside the tissue
• Beat frequency produced at the intersection = difference between the two frequencies
• Example: Circuit 1 = 4000 Hz, Circuit 2 = 4100 Hz → Beat frequency = 100 Hz inside tissue

---

Why Use Medium Frequency?

• Skin resistance is inversely proportional to frequency (higher frequency = lower skin resistance)
• MF current penetrates skin easily (comfortable, less skin irritation)
• Beat frequency inside tissue is in the low-frequency therapeutic range (1-150 Hz)
• Advantage: Deep penetration with low skin resistance + therapeutic effects of low-frequency current

---

IFT Parameters

Beat Frequency Ranges and Effects

Sweep (AMF - Amplitude Modulation Frequency)

• Automatically cycles through a range of beat frequencies
• Prevents accommodation (tissue gets used to single frequency)
• Example: Sweep 1-100 Hz cycles between these frequencies continuously

---

Types of IFT

True (Classic) IFT

• Two separate channels, 4 electrodes
• Currents cross inside the body at 90°
• Beat frequency produced internally

Premodulated IFT

• Interference done in the machine (not inside the body)
• Two electrodes only (like TENS)
• Used when electrode placement is difficult or uncomfortable (children, small areas)
• Less deep penetration than true IFT

---

Indications of IFT

• Acute and chronic pain (musculoskeletal)
• Edema reduction (especially post-traumatic edema)
• Muscle strengthening and re-education
• Stress incontinence (pelvic floor stimulation)
• Peripheral circulatory disorders
• Wound healing

Contraindications of IFT

• Same as TENS + caution over areas with impaired sensation
• Pacemakers, active implants
• Malignancy, thrombophlebitis
• Skin infections in electrode area

---

TOPIC 4: ULTRASOUND THERAPY (US)

Physics of Ultrasound

Definition

• Sound waves at frequencies above the audible range (>20,000 Hz / 20 kHz)
• Therapeutic US: 0.75 MHz, 1 MHz, 3 MHz

Production (Piezoelectric Effect)

• Reverse piezoelectric effect: Electrical energy converted to mechanical energy (sound waves)
• Piezoelectric crystals (PZT - lead zirconate titanate) in the transducer head vibrate when AC current applied
• These vibrations = sound waves transmitted into tissue
• Direct piezoelectric effect: Mechanical pressure on crystal produces electrical charge (used in diagnostic US)

Frequency and Depth of Penetration

• 1 MHz: Penetrates 3-5 cm depth (deeper structures) - used for deep muscles, large joints
• 3 MHz: Penetrates 1-2 cm depth (superficial structures) - used for superficial tendons, scars
• Higher frequency = More superficial penetration (absorbed more quickly)
• Lower frequency = Deeper penetration

---

Modes of Ultrasound

Continuous Mode

• US delivered without interruption
• Produces thermal effects (tissue heating)
• Used for: chronic conditions, tightening scar tissue, increasing extensibility before stretching

Pulsed Mode

• US interrupted with on/off periods
• Duty cycle commonly used: 20% (on 2 ms, off 8 ms) or 50%
• Non-thermal (mechanical) effects predominate at low duty cycles
• Used for: acute conditions, inflammation, edema, nerve regeneration

---

Therapeutic Effects

Thermal Effects (Continuous US)

• Raises tissue temperature 1-4°C (therapeutic range)
• Effects:
  • Increased tissue extensibility (stretch before stretching exercises)
  • Increased circulation (vasodilation)
  • Reduced muscle spasm
  • Reduced pain
  • Increased metabolic rate
  • Increased collagen extensibility

Non-Thermal (Mechanical/Biological) Effects

Cavitation

• Stable cavitation: Gas bubbles in tissue fluid oscillate in the US field → micro-streaming of fluid around bubbles → cell membrane stimulation → enhanced cellular activity, wound healing
• Unstable (transient) cavitation: Gas bubbles collapse violently → tissue damage → AVOID (use proper technique, move transducer continuously)

Acoustic Streaming

• Unidirectional movement of fluids along cell membranes caused by US
• Enhances ion transport, increases cell permeability
• Promotes wound healing, increases fibroblast activity

---

US Parameters

BNR (Beam Non-Uniformity Ratio)

• Ideal BNR ≤ 6:1 (lower = more uniform beam = safer)
• High BNR = hot spots in beam = risk of damage
• Keep transducer moving constantly to prevent hot spots

---

Indications of Therapeutic Ultrasound

• Soft tissue lesions: muscle strains, ligament sprains, tendinopathy
• Periarticular conditions: frozen shoulder, bursitis, epicondylitis
• Scar tissue management (post-surgical, burns) - increases extensibility
• Delayed fracture healing (low-intensity pulsed US - LIPUS)
• Wound healing (pulsed US)
• Phonophoresis (delivery of drugs through skin using US)

Contraindications of Therapeutic Ultrasound

• Over epiphyseal plates in children (may damage growth plates)
• Over eyes (cavitation in vitreous)
• Over gonads (reproductive risk)
• Over malignancy
• Over pacemaker/implanted electronics
• Over spinal cord after laminectomy (cord exposed)
• Over pregnant uterus
• Over thrombophlebitis (may dislodge clot)
• Over hemorrhagic areas
• Over metal implants - CONTROVERSIAL (not absolute contraindication; metal conducts heat but implant is remote from treatment area - many textbooks say avoid directly over metal)

---

Phonophoresis

• Using ultrasound to drive drug molecules through the skin
• Mechanism: mechanical disruption of skin + thermal loosening of lipid bilayer
• Common drugs: Hydrocortisone (anti-inflammatory), Diclofenac gel, Lidocaine (anesthetic)

---

TOPIC 5: SHORTWAVE DIATHERMY (SWD)

Definition

• Application of high-frequency electromagnetic energy to heat deep tissues
• Frequency: 27.12 MHz (standard; allocated by ITU)
• Wavelength: 11 meters

---

Types of SWD

Condenser (Capacitive) Field Method

• Electrodes placed on either side of body part
• Patient's tissue acts as the dielectric between capacitor plates
• Tissues with high water content (muscle) heat more
• Good for: muscles, interstitial fluid-rich tissues

Inductive (Cable/Coil/Drum) Method

• Coil of wire or drum applicator placed near the body
• Produces magnetic field → induces eddy currents in tissues → heat production
• Tissues with high electrical conductivity heat more (high water content = higher conductivity)
• Best penetration of deep structures
• More comfortable

---

Modes of SWD

Continuous SWD

• Continuous electromagnetic emission
• Thermal effects (raises deep tissue temperature to 40-45°C)
• Used for: chronic conditions, joint stiffness, muscle spasm, chronic inflammation

Pulsed SWD (PSWD) / Pulsed Electromagnetic Energy (PEME)

• Interrupted electromagnetic pulses
• Non-thermal/athermal effects predominate
• Used for: acute conditions, edema, wound healing, nerve regeneration
• Duration on/off ratio chosen to avoid heat buildup

---

Therapeutic Dose Levels

---

Thermal Effects of SWD

• Increased tissue temperature (deep heating to 3-5 cm depth)
• Reduced muscle spasm, increased extensibility of connective tissue
• Increased blood flow, increased metabolic rate
• Pain relief

Non-Thermal Effects (Pulsed SWD)

• Accelerates wound healing, reduces edema
• Enhances collagen synthesis, stimulates fibroblasts
• Nerve regeneration support
• Cell membrane effects

---

Indications of SWD

• Chronic musculoskeletal conditions: OA, chronic LBP, frozen shoulder
• Subacute soft tissue injuries (pulsed mode)
• Sinusitis (continuous SWD over sinuses - deep heating)
• Pelvic inflammatory disease (old usage, rarely used now)

Contraindications of SWD

• Metal implants (pacemakers, metal plates, screws) - absolute contraindication (metal heats rapidly = burns)
• Pregnancy (over abdomen/pelvis)
• Malignancy
• Hemorrhage/bleeding disorders
• Impaired sensation (cannot report overheating = burn risk)
• Wet dressings, plaster casts (moisture conducts current unevenly = burns)
• Ischemic areas (cannot dissipate heat = burns)
• Epiphyseal plates in children
• Testicular area (temperature-sensitive spermatogenesis)

---

TOPIC 6: MICROWAVE DIATHERMY (MWD)

Definition

• Application of microwave electromagnetic radiation for deep tissue heating
• Frequency: 2450 MHz (or 915 MHz for deeper penetration)
• Wavelength: 12.25 cm
• More superficial than SWD (penetrates ~3 cm)

Properties

• Selective heating of tissues with high water content
• Produces more uniform heating than SWD
• Focused beam (like a torch) - easily directed
• Cannot be used over joints with synovial fluid (excessive heating of joint)
• Cannot be used over metal implants

Key Difference from SWD

---

TOPIC 7: LASER THERAPY (LLLT - Low Level Laser Therapy)

Definition

• LASER = Light Amplification by Stimulated Emission of Radiation
• Low Level Laser Therapy (LLLT) / Cold Laser / Photobiomodulation
• Does NOT produce significant heat (unlike surgical laser)
• Wavelength: 600-1000 nm (red to near-infrared spectrum)

---

Properties of Laser Light (4 unique properties)

1. Monochromatic: Single wavelength (one color)
2. Coherent: All waves in same phase (synchronized)
3. Collimated (parallel): Beams travel parallel, don't diverge
4. High intensity: Concentrated energy

---

Types Used in Physiotherapy

• Helium-Neon (He-Ne) laser: Wavelength 632.8 nm (red); superficial penetration (~1-2 mm)
• Gallium-Arsenide (Ga-As) laser: Wavelength 904 nm (near-infrared); deeper penetration (~2-3 cm); pulsed
• Gallium-Aluminum-Arsenide (Ga-Al-As): Wavelength 780-870 nm; continuous or pulsed; moderate penetration

---

Biological Effects (Photobiomodulation)

• Stimulates mitochondria → increased ATP production
• Enhanced cell metabolism, collagen synthesis, fibroblast activity
• Reduced inflammation (reduced prostaglandins, bradykinin)
• Pain relief (altered nerve conduction, endorphin release)
• Wound healing acceleration
• Nerve regeneration support

---

Indications

• Wound healing (chronic wounds, pressure sores, diabetic ulcers)
• Soft tissue injuries (strains, sprains, tendinopathy)
• Post-herpetic neuralgia, peripheral neuropathy pain
• Trigger point treatment
• Lymphedema management

Contraindications

• Direct irradiation of the eye (causes retinal damage - both patient and therapist must wear protective goggles)
• Malignancy (promotes cell proliferation)
• Pregnancy (over abdomen/pelvis)
• Photosensitive skin conditions, patients on photosensitizing medications
• Active hemorrhage
• Over thyroid gland and endocrine glands
• Over growth plates in children (epiphyses)

---

TOPIC 8: ULTRASOUND - PHONOPHORESIS vs. IONTOPHORESIS

---

Iontophoresis in Detail

• Principle: Like charges repel - drug placed under electrode of same polarity → driven into tissue
• Positive drug (e.g., lidocaine) placed under anode → pushed in by anode (positive repels positive)
• Negative drug (e.g., dexamethasone, acetic acid) placed under cathode
• Current used: 0.1-0.5 mA/cm² (very low intensity)
• Acetic acid (negative) → treats calcium deposits (hydroxyapatite) - calcium + acetic acid → calcium acetate (soluble)
• Zinc ions (positive) → wound healing (bacteriostatic)

---

TOPIC 9: ELECTRICAL STIMULATION (NMES, FES, EMS)

NMES (Neuromuscular Electrical Stimulation)

• Electrical stimulation of intact peripheral nerves to cause muscle contraction
• Uses: Muscle strengthening (post-surgery, disuse atrophy), muscle re-education, reduction of spasticity (in upper motor neuron lesions via reciprocal inhibition), spasm reduction

FES (Functional Electrical Stimulation)

• Electrical stimulation synchronized to produce functional movements (replaces lost voluntary control)
• Example: Drop foot stimulator (stimulates common peroneal nerve → dorsiflexion during swing phase of gait)
• Freewalk / WalkAide = commercial FES devices for drop foot
• Used in: Spinal cord injury (standing, cycling), stroke (upper limb function, drop foot), multiple sclerosis

EMS (Electrical Muscle Stimulation) - Denervated Muscle

• Used when nerve is damaged → must directly stimulate muscle fiber (nerve cannot conduct)
• Uses long pulse duration (> 1 ms, usually 10-100 ms) and low frequency (1-10 Hz)
• Prevents/reduces denervation atrophy, maintains muscle bulk during nerve regeneration
• Uses DC or modified square wave pulses

---

Strength-Duration (S-D) Curve - Key Concepts

Parameters

• Rheobase: Minimum current intensity needed when pulse duration is infinitely long
• Chronaxie: Minimum pulse duration needed at TWICE rheobase intensity
• Represents tissue excitability
• Chronaxie for motor nerves: < 1 ms (short, easily excited)
• Chronaxie for denervated muscle: > 10 ms (long, needs much longer pulse)

Clinical Interpretation

• Normal S-D curve: Steep curve; rheobase low; chronaxie short
• Denervated muscle S-D curve: Curve shifts right (needs longer pulse for same stimulation)
• Partial denervation: Two kinks in S-D curve (some normal fibers + some denervated)
• Re-innervation: Curve gradually shifts back toward normal

Uses of S-D Curve

• Diagnose denervation
• Monitor progress of nerve regeneration
• Determine appropriate pulse parameters for electrical stimulation of denervated muscle
• Differentiate complete vs. partial denervation

---

TOPIC 10: TRACTION

Definition

• Application of a pulling force along the long axis of the spine to separate vertebrae
• Creates distraction of intervertebral disc, widens IVF, reduces nerve root compression

---

Types of Spinal Traction

Cervical Traction

• Manual traction: Therapist's hands apply force
• Mechanical traction: Machine applies force (more consistent, measurable)
• Position: Slight flexion (15-25° forward) opens posterior IVF → better for radiculopathy
• Force: 25-50% of body weight (practical range: 5-15 kg)
• Disc herniation: Flexed position; Facet joint: Neutral or slight extension

Lumbar Traction

• Mechanical traction: Most common
• Force: 25-50% of body weight minimum needed to separate lumbar vertebrae (to overcome friction)
  • Minimum effective force = 25-30% BW for mechanical separation
  • For friction reduction: split table (frictionless) allows lower forces
• Position: Hip and knee flexion (psoas relaxation, posterior IVF widening)

---

Types of Traction Techniques

Static/Sustained Traction

• Constant force applied for the entire treatment session
• 15-30 minutes
• Used for: Disc herniation, nerve root compression

Intermittent Traction

• Force alternates between a hold and rest phase (e.g., 30 seconds on, 10 seconds off)
• Better tolerated, less risk of muscle spasm from prolonged stretch
• Used for: Muscle spasm, joint hypomobility, disc conditions

Auto-Traction

• Patient controls the traction force using their own muscles
• Used for lumbar disc herniation

Gravity (Positional) Traction

• Uses body weight and positioning (e.g., hanging from a bar for cervical traction)

---

Indications of Traction

• Disc herniation with nerve root compression (radiculopathy)
• Cervical and lumbar spondylosis
• Muscle spasm
• Degenerative joint disease (IVF narrowing)
• Facet joint syndromes

Contraindications of Traction

• Cauda equina syndrome (emergency - surgery, not traction)
• Acute inflammatory disease (RA of cervical spine - ligaments lax, atlantoaxial subluxation risk)
• Osteoporosis (bone may fracture under traction force)
• Malignancy of spine (pathological fracture risk)
• Spinal cord compression (myelopathy)
• Vertebral artery insufficiency (cervical traction - may compromise VBI)
• Pregnancy (over abdomen)
• Aortic aneurysm (abdominal traction)
• Acute disc herniation with severe neurological deficit (relative)

---

TOPIC 11: HEAT THERAPY (THERMOTHERAPY)

Superficial Heat Agents

Hot Water Bottle

• Simple, cheap; temperature ~60°C (but insulated to ~40-45°C at skin)
• Risk of burns (especially with impaired sensation)

Infrared (IR) Radiation

• Electromagnetic radiation just beyond visible red light
• Near IR (NIR): 0.78-1.5 μm wavelength; penetrates ~3-10 mm; produces heat in superficial dermis
• Far IR: 1.5-1000 μm; absorbed at skin surface
• Luminous (bright) IR lamp: Emits both heat and light; penetrates deeper
• Non-luminous (dull) IR lamp: Emits only heat (longer wavelength); more superficial
• Application: lamp 45-60 cm from skin, 15-20 min

Moist Heat (Hydrocollator Packs)

• Canvas packs filled with silica gel, heated in water to ~70°C, wrapped in towels
• Applied for 15-20 minutes
• Moist heat penetrates slightly better than dry heat
• Risk: burns if too many layers removed

Paraffin Wax Bath

• Mixture of paraffin wax + mineral oil (7:1 ratio)
• Temperature: 40-54°C (lower melting point than pure paraffin due to oil)
• Methods:
  • Dip method: Dip hand 8-12 times, form a glove, cover with plastic bag + towel for 15-20 min
  • Immersion method: Keep hand immersed in bath throughout treatment
  • Paint method: Brush melted wax onto body part (for larger areas or irregular surfaces)
• Excellent for: hands and feet in RA, hand burns, joint stiffness
• Contraindications: open wounds, skin infections, impaired sensation, skin rash

Fluidotherapy

• Dry heat using warm air blown through cellulose particles (like dry quicksand)
• Temperature: 38-47°C
• Allows exercise during treatment
• Used for: distal extremities, wound debridement

---

Deep Heat Agents

• Ultrasound (1 MHz, continuous) - covered in Topic 4
• SWD - covered in Topic 5
• MWD - covered in Topic 6

---

Physiological Effects of Heat

• Vasodilation (increased blood flow)
• Increased metabolic rate (10% increase per 1°C rise)
• Increased tissue extensibility (collagen becomes more plastic → stretch before exercises)
• Muscle relaxation (reduces spasm)
• Pain relief (Counter-irritation + reduced nerve conduction velocity of pain fibers)
• Increased edema (in acute conditions: contraindicated)
• Sedation (parasympathetic response)

Contraindications of Heat

• Acute inflammation (0-72 hrs post injury) - increases edema, metabolic demands
• Impaired sensation (cannot detect overheating = burns)
• Impaired circulation (ischemia - cannot dissipate heat)
• Malignancy (increases metabolic rate, may spread tumor)
• Bleeding disorders, anticoagulants
• Metal implants (SWD and MWD only)

---

TOPIC 12: CRYOTHERAPY (COLD THERAPY)

Definition

• Application of cold to the body for therapeutic purposes

Methods

• Ice packs (crushed ice in plastic bag with towel)
• Ice massage (directly rub ice cube)
• Cold spray (ethyl chloride / Fluori-Methane spray)
• Ice bath/bucket immersion
• Cryo-cuff (compression + cold)
• Cold compression units

---

Physiological Effects of Cold

Immediate Effects

• Vasoconstriction (reduces blood flow, reduces edema in acute injury)
• Reduced metabolic rate (reduces oxygen demand of damaged tissue)
• Analgesia (slows nerve conduction velocity - especially C fibers)
• Reduced muscle spasm (via cooling of muscle spindle)
• Reduced inflammation (reduced enzymatic activity)

After Prolonged Cold (>15 min)

• Hunting reaction (Lewis Reaction): Alternating vasodilation and vasoconstriction (body's protective mechanism to prevent frostbite)

Cold-Induced Analgesia Sequence

1. Cold sensation
2. Burning/aching sensation
3. Numbness (analgesia) ← treatment goal
4. Pain (if extreme cold - danger zone)

---

Indications of Cryotherapy

• Acute injuries (within 72 hours) - PRICE protocol
• Post-exercise soreness (DOMS)
• Spasticity management (temporarily reduces tone before exercise)
• Muscle spasm
• Post-operative swelling

Contraindications of Cryotherapy

• Raynaud's phenomenon/disease (cold triggers arterial spasm)
• Cold hypersensitivity / cryoglobulinemia (cold urticaria)
• Impaired circulation (peripheral vascular disease)
• Impaired sensation
• Open wounds (direct cold on wound)
• Cold intolerance (rare metabolic conditions)

---

Cryotherapy vs. Heat - When to Use

---

TOPIC 13: HYDROTHERAPY (Electrotherapy Aspect)

Whirlpool Bath

• Warm or cold water with turbines agitating the water
• Temperature ranges:
  • Cold: 15-21°C (acute injuries, DOMS)
  • Neutral: 33-36°C (general rehabilitation)
  • Warm: 37-40°C (chronic conditions, wound debridement)
  • Hot: 40-43°C (maximum - spasticity, severe chronic stiffness)
• Used for: wound debridement, edema, ROM improvement, relaxation, burn debridement

Contrast Bath

• Alternating immersion in warm (38-44°C) and cold (15-18°C) water
• Ratio: typically 3 minutes warm : 1 minute cold (repeated 4-5 cycles)
• Always START in warm, END in warm (if stimulating circulation)
• Effects: alternating vasodilation and vasoconstriction = "vascular pumping" → edema reduction
• Used for: subacute injuries, peripheral circulatory conditions, Raynaud's (avoid extremes)

---

TOPIC 14: WAVEFORMS & CURRENT TYPES IN ELECTROTHERAPY

Russian Current (Kots Current)

• 2500 Hz AC carrier frequency
• Delivered in 10 ms ON / 10 ms OFF bursts (50 Hz burst frequency)
• Comfortable medium-frequency current producing strong muscle contractions
• Used for: muscle strengthening (post-surgery, sports rehabilitation)
• First described by Yakov Kots for Soviet Olympic athletes

High Voltage Pulsed Current (HVPC)

• High voltage (100-500 V) with very short pulse duration (< 200 μs)
• Monophasic twin-spiked waveform
• Large current spread, comfortable
• Used for: wound healing (positive pole = bacteriostatic; negative pole = tissue healing), edema reduction, pain management

MENS (Microcurrent Electrical Neuromuscular Stimulation)

• Sub-sensory current levels (< 1000 μA = microampere range)
• Below threshold of sensation
• Promotes wound healing by mimicking the body's bioelectric field
• Used for: wound healing, fracture non-union, pain

TNS (Transcutaneous Nerve Stimulation) - same as TENS above

---

TOPIC 15: ELECTROMAGNETIC SPECTRUM IN PHYSIOTHERAPY

---

Ultraviolet (UV) Therapy

Types

• UVA: 320-400 nm (long wave) - used in PUVA therapy for psoriasis
• UVB: 280-320 nm (medium wave) - most used therapeutically (bactericidal, Vitamin D synthesis)
• UVC: 200-280 nm (short wave) - germicidal, bactericidal (used for wound/ulcer treatment)

Biological Effects of UV

• Erythema (skin redness) - used to classify dose
• Pigmentation (tanning): UVA > UVB
• Vitamin D synthesis (UVB)
• Bactericidal effect (UVC most potent)
• Epidermal thickening (hyperkeratosis)
• Immunosuppression (locally - used in psoriasis)

UV Dosage - Minimal Erythema Dose (MED)

• MED = minimum dose that produces just perceptible erythema on untreated skin 8 hours after irradiation
• E1 dose (sub-erythemal): No visible erythema
• E2 dose (minimal erythema dose = 1 MED): Faint pink erythema, gone within 24h
• E3 dose (suprathreshold = 2.5 MED)**: Definite redness lasting 1-3 days, slight peeling
• E4 dose (maximum = 5 MED)**: Severe redness + blistering + peeling lasting > 3 days

Indications of UV

• Psoriasis (PUVA: Psoralen + UVA)
• Wound healing and infected wounds (UVC - bactericidal)
• Rickets (UVB - Vitamin D production)
• Vitiligo (PUVA)
• Acne (UVB/UVC bactericidal)

Contraindications of UV

• Acute sunburn (recent UV exposure)
• Skin cancers, photosensitivity
• Systemic lupus erythematosus (SLE)
• Patients on photosensitizing drugs (tetracyclines, sulphonamides, psoralen)
• Eyes must be covered throughout UV treatment (both patient AND therapist)

---

QUICK-FIRE REVISION - ELECTROTHERAPY

Key Frequencies

• SWD = 27.12 MHz
• MWD = 2450 MHz
• IFT carrier = 4000 Hz (beat frequency = difference between two circuits)
• Russian current = 2500 Hz
• Conventional TENS = 80-150 Hz
• AL-TENS = 1-4 Hz
• US therapy = 1 MHz (deep) or 3 MHz (superficial)
• UV-C = 200-280 nm (germicidal)
• He-Ne laser = 632.8 nm
• Ga-As laser = 904 nm

Mechanisms

• Conventional TENS = Gate control theory (Aβ fibers, substantia gelatinosa)
• AL-TENS = Endorphin release (Aδ fibers, PAG)
• US thermal effect = tissue heating (continuous mode)
• US non-thermal = cavitation + acoustic streaming (pulsed mode)
• SWD = resistive heating (capacitive) / eddy current heating (inductive)
• IFT = beat frequency produced internally; deeper penetration at lower skin resistance
• Iontophoresis = DC drives ions (like charges repel)
• Phonophoresis = US drives drugs

Contraindication - Metal Implants

• SWD = Absolute contraindication (rapidly heats metal)
• MWD = Absolute contraindication
• US = Controversial (not absolute for US; avoid directly over metal)
• TENS = NOT a contraindication (low voltage, safe around metal)
• IFT = Same as TENS (safe around metal)

Paraffin Wax

• Temperature: 40-54°C
• Ratio: paraffin wax + mineral oil = 7:1

UV Doses

• MED = minimal erythema dose (faint pink at 8 hours = E2)
• E1 = no erythema; E2 = 1 MED; E3 = 2.5 MED; E4 = 5 MED

S-D Curve

• Rheobase = minimum intensity at infinite pulse duration
• Chronaxie = pulse duration at 2× rheobase
• Normal nerve chronaxie < 1 ms
• Denervated muscle chronaxie > 10 ms

Traction

• Cervical traction position = 15-25° flexion for radiculopathy
• Lumbar minimum force = 25% body weight (to overcome friction)
• Cauda equina = absolute contraindication

Heat vs. Cold

• Acute injury: COLD first (72 hours)
• Before stretching: HEAT (increases extensibility)
• DOMS recovery: COLD
• Spasticity before exercise: COLD (temporarily reduces tone)
• Chronic stiffness: HEAT (increases collagen extensibility)

---

---

Topics Already Covered:

1. Basics of Electricity - Current, voltage, resistance, Ohm's law, pulse parameters, waveforms
2. TENS - Conventional, AL-TENS, Burst, Brief Intense; Gate Control Theory; parameters table
3. Interferential Therapy (IFT) - Beat frequency, true vs. premodulated, frequency ranges and effects
4. Ultrasound Therapy - Piezoelectric effect, 1 MHz vs. 3 MHz, thermal vs. non-thermal, cavitation, BNR, phonophoresis
5. Shortwave Diathermy (SWD) - 27.12 MHz, capacitive vs. inductive, dose levels I-IV, continuous vs. pulsed
6. Microwave Diathermy (MWD) - 2450 MHz, comparison with SWD
7. Laser Therapy (LLLT) - He-Ne, Ga-As, 4 properties of laser, photobiomodulation
8. Phonophoresis vs. Iontophoresis - Full comparison table, drug examples
9. Electrical Stimulation - NMES, FES, EMS, Strength-Duration curve
10. Traction - Cervical and lumbar, types, indications, contraindications
11. Heat Therapy - IR, paraffin wax (7:1, 40-54°C), moist heat, fluidotherapy
12. Cryotherapy - Effects, hunting reaction, cold vs. heat comparison table
13. Hydrotherapy - Whirlpool, contrast bath (3:1 ratio)
14. Waveforms - Russian current (2500 Hz), HVPC, MENS
15. Electromagnetic Spectrum + UV Therapy - UV types, MED dosage (E1-E4), PUVA

---

Quick Reference - Most Important Numbers:

---

---

COMPLETE ELECTROTHERAPY NOTES FOR MPT ENTRANCE

---

TOPIC 1: BASICS OF ELECTRICITY (FOUNDATION)

Fundamental Electrical Terms

Current (I)

• Flow of electrons through a conductor
• Unit: Ampere (A) or milliampere (mA)
• Types:
  • Direct Current (DC): Electrons flow in ONE direction only (unidirectional). Also called Galvanic current
  • Alternating Current (AC): Electrons flow BACK and FORTH (bidirectional) - reverses direction periodically
  • Pulsed Current: Interrupted flow with on/off periods (most used in physiotherapy)

Voltage (V)

• The electrical potential difference (force that drives current)
• Unit: Volt (V)

Resistance (R)

• Opposition to current flow
• Unit: Ohm (Ω)
• Skin has high resistance; body fluids have low resistance
• Wet skin = lower resistance; dry, thick, calloused skin = higher resistance

Ohm's Law

• V = I × R
• Voltage = Current × Resistance
• If resistance is high, you need more voltage to push the same current

Impedance

• Total opposition to AC current flow (includes resistance + reactance)
• Capacitance and inductance of tissue contribute to impedance

Power

• Unit: Watt (W)
• Power = Voltage × Current (P = V × I)

---

Parameters of Pulsed Current

Pulse Duration (Pulse Width)

• Time for which current flows in a single pulse
• Unit: microseconds (μs) or milliseconds (ms)
• Short pulses: sensory stimulation only
• Long pulses: motor + sensory stimulation

Pulse Frequency (Pulse Rate)

• Number of pulses per second
• Unit: Hertz (Hz)
• Low frequency: < 1000 Hz; High frequency: > 1000 Hz

Amplitude (Intensity)

• Height of the waveform (magnitude of current or voltage)
• Determines depth of penetration and physiological effect

Ramp Time (Rise Time)

• Time taken for current to reach maximum amplitude
• Slow ramp = gentle muscle stimulation (prevents fatigue)

Duty Cycle

• Duty cycle = ON time / (ON time + OFF time) × 100%
• 50% duty cycle = equal on and off time

Waveform Types

• Monophasic: Current flows in one direction only
• Biphasic: Current flows in both directions (symmetrical or asymmetrical)
• Polyphasic: Multiple phases (e.g., Russian current)

---

Tissue Excitability Concepts

Chronaxie and Rheobase

• Rheobase: Minimum current intensity needed to stimulate tissue with an infinitely long pulse
• Chronaxie: Minimum pulse duration needed at TWICE rheobase intensity
• Normal nerve chronaxie: < 1 ms
• Denervated muscle chronaxie: > 10 ms

Strength-Duration (S-D) Curve

• Graph plotting stimulus intensity vs. pulse duration needed for excitation
• Normal nerve: steep curve, short chronaxie
• Denervated muscle: curve shifts RIGHT (needs longer pulse)
• Partial denervation: two kinks in curve
• Re-innervation: curve shifts back toward normal
• Uses: diagnose denervation, monitor nerve regeneration, set stimulation parameters

---

TOPIC 2: TENS (TRANSCUTANEOUS ELECTRICAL NERVE STIMULATION)

Definition

---

Types of TENS

Conventional TENS (High-Frequency TENS)

• Frequency: 80-150 Hz
• Pulse duration: 10-80 μs (short)
• Intensity: Sensory level - strong tingling, NO muscle contraction
• Onset: Fast (minutes)
• Duration of relief: Short (only while machine is on)
• Mechanism: Gate Control Theory
  • Stimulates large-diameter Aβ fibers
  • Aβ activity activates interneurons in substantia gelatinosa that CLOSE the gate
  • Blocks transmission of Aδ and C fiber pain signals
  • NO endorphin release
• Best for: Acute pain, pain during physiotherapy

Acupuncture-Like TENS (AL-TENS)

• Frequency: 1-4 Hz
• Pulse duration: 100-400 μs (long)
• Intensity: Motor level - visible muscle twitching
• Onset: Slow (20-30 minutes)
• Duration of relief: Longer (outlasts treatment)
• Mechanism: Endogenous opioid release
  • Stimulates Aδ fibers → descending inhibitory pathways → endorphin/enkephalin release from PAG (periaqueductal gray)
  • Effect blocked by naloxone (confirms opioid mechanism)
• Best for: Chronic pain, trigger points

Burst Mode TENS

• High-frequency bursts (100 Hz) at low burst rate (2-4 bursts/second)
• Combines gate control + some opioid release
• Rhythmic muscle twitching, more tolerable than AL-TENS

Brief Intense TENS

• Very high frequency (150 Hz) + very long pulse duration (250 μs)
• Maximum intensity just below painful threshold
• Used for: brief painful procedures (wound dressing, joint mobilization)
• Maximum 15 minutes use

---

TENS Parameters Summary Table

---

Gate Control Theory (Melzack and Wall, 1965)

• Gate is in the substantia gelatinosa of the dorsal horn
• Small fibers (Aδ, C): Open the gate → pain transmitted
• Large fibers (Aβ): Close the gate → pain blocked
• T cell (transmission cell) sends pain to thalamus when gate is open
• TENS, massage, and pressure activate Aβ fibers to close the gate

---

TENS Electrode Placement

• Over or adjacent to painful area
• Over the nerve supplying the area
• At dermatomal level corresponding to pain
• Acupuncture / trigger points (AL-TENS)
• Contralateral mirror image (stump pain, hypersensitive areas)

Contraindications of TENS

• Over anterior neck / carotid sinus (reflex bradycardia, hypotension)
• Over eyes
• Transcerebrally (across the head)
• Transthoracically (across the chest - cardiac interference)
• Pacemaker / cardiac implants
• Malignancy (may promote cell growth)
• Pregnancy (first trimester, over abdomen/lower back)
• Epilepsy (transcranial)
• Confused patients unable to report pain

---

TOPIC 3: INTERFERENTIAL THERAPY (IFT)

Principle

• Two medium-frequency currents (~4000 Hz each) applied simultaneously via 4 electrodes
• Two circuits cross at 90° inside the tissue
• Beat frequency = difference between the two frequencies
• Example: 4000 Hz + 4100 Hz → Beat frequency = 100 Hz inside tissue
• Beat frequency is in the low-frequency therapeutic range

---

Why Medium Frequency?

• Skin resistance is inversely proportional to frequency
• Higher frequency = lower skin resistance = comfortable deep penetration
• Therapeutic effects of low frequency produced inside tissue without skin discomfort

---

Beat Frequency Ranges and Clinical Effects

---

Sweep (AMF)

• Automatically cycles through a range of beat frequencies
• Prevents accommodation (tissue adapts to single frequency)
• Example sweep: 1-100 Hz cycles continuously

---

Types of IFT

True (Classic) IFT

• 4 electrodes, 2 channels
• Interference occurs INSIDE the body
• Deeper penetration, larger treatment area

Premodulated IFT

• Interference done INSIDE the machine
• 2 electrodes only (easier to apply)
• Used for small areas, children, difficult placement
• Less deep penetration than true IFT

---

Indications of IFT

• Acute and chronic musculoskeletal pain
• Post-traumatic edema (25-50 Hz)
• Muscle strengthening and re-education
• Stress urinary incontinence (pelvic floor stimulation)
• Peripheral circulatory disorders

Contraindications of IFT

• Pacemakers, implanted electronic devices
• Malignancy
• Thrombophlebitis (deep vein thrombosis)
• Impaired sensation
• Transthoracic placement

---

TOPIC 4: ULTRASOUND THERAPY

Physics of Ultrasound

Definition

• Sound waves above audible range (> 20,000 Hz / 20 kHz)
• Therapeutic range: 0.75 MHz, 1 MHz, 3 MHz

Production - Piezoelectric Effect

• Reverse piezoelectric effect: Electrical energy → mechanical energy (sound waves)
• Piezoelectric crystal (PZT - lead zirconate titanate) vibrates when AC applied → generates US waves
• Direct piezoelectric effect: Pressure on crystal → electrical charge (used in diagnostic US)

Frequency and Depth

• Higher frequency = more superficial (absorbed faster)
• Lower frequency = deeper penetration

---

Modes of US

Continuous Mode

• US delivered without interruption
• Thermal effects dominate (tissue heating 1-4°C)
• Used for: chronic conditions, tightening scars, pre-stretch tissue heating

Pulsed Mode

• US interrupted (on/off periods)
• Common duty cycles: 20% or 50%
• Non-thermal (mechanical) effects dominate
• Used for: acute conditions, inflammation, edema, wound healing, nerve regeneration

---

Therapeutic Effects

Thermal Effects (Continuous US)

• Tissue temperature rise 1-4°C
• Increased extensibility of collagen (stretch after US)
• Vasodilation, increased circulation
• Reduced muscle spasm
• Pain relief
• Increased metabolic rate

Non-Thermal Effects (Pulsed US)

Stable Cavitation

• Gas bubbles oscillate in US field
• Micro-streaming around bubbles → stimulates cell membranes
• Enhanced cellular activity, wound healing, increased membrane permeability

Unstable (Transient) Cavitation

• Bubbles collapse violently → tissue damage (AVOID)
• Prevented by: moving transducer constantly, using appropriate intensity

Acoustic Streaming

• Unidirectional movement of fluid along cell membranes
• Enhances ion transport, increases cell permeability
• Promotes wound healing, increases fibroblast activity

---

US Parameters

BNR (Beam Non-Uniformity Ratio)

• Ratio of peak intensity to average intensity in the beam
• Ideal BNR ≤ 6:1 (lower = more uniform = safer)
• High BNR = hot spots in beam = risk of burns
• Always move transducer continuously to prevent hotspots

---

Phonophoresis

• Using US to drive drug molecules through skin into tissue
• Mechanism: mechanical disruption of stratum corneum + thermal loosening of lipid bilayer
• Common drugs: Hydrocortisone (anti-inflammatory), Diclofenac gel, Lidocaine (anaesthetic)
• Advantage over iontophoresis: neutral (non-ionized) drugs can be used

---

Indications of Therapeutic US

• Muscle strains, ligament sprains, tendinopathy
• Frozen shoulder, bursitis, epicondylitis
• Scar tissue management (pre-stretch)
• Delayed fracture healing (LIPUS - Low Intensity Pulsed US)
• Wound healing (pulsed US)
• Phonophoresis drug delivery

Contraindications of US

• Over epiphyseal plates in children
• Over eyes (cavitation in vitreous humor)
• Over gonads (reproductive risk)
• Malignancy
• Pacemaker / implanted electronics
• Over exposed spinal cord (post-laminectomy)
• Over pregnant uterus
• Thrombophlebitis (may dislodge clot)
• Over hemorrhagic areas
• Metal implants - controversial (avoid directly over metal; many sources say relative contraindication)

---

TOPIC 5: SHORTWAVE DIATHERMY (SWD)

Definition

• High-frequency electromagnetic energy to heat deep tissues
• Frequency: 27.12 MHz (internationally allocated)
• Wavelength: 11 meters
• Penetrates 3-5 cm deep

---

Types / Methods of SWD

Condenser (Capacitive) Field Method

• Electrodes placed on either side of body part
• Patient's tissue acts as dielectric between capacitor plates
• Tissues with high water content (muscle) heat more
• Good for: muscular conditions

Inductive (Coil/Cable/Drum) Method

• Coil of wire or drum applicator placed near body
• Produces magnetic field → induces eddy currents in tissue → heat
• Tissues with high electrical conductivity heat more
• Deeper penetration, more uniform heating
• More comfortable than condenser method

---

Modes of SWD

Continuous SWD

• Constant electromagnetic emission
• Thermal effects (raises deep tissue to 40-45°C)
• Used for: chronic stiffness, joint conditions, muscle spasm

Pulsed SWD (PSWD) / PEME (Pulsed Electromagnetic Energy)

• Interrupted pulses (on/off)
• Non-thermal/athermal effects dominate
• Used for: acute injuries, edema, wound healing, nerve regeneration

---

Dose Levels of SWD

---

Effects of SWD

Thermal Effects

• Deep tissue heating (3-5 cm)
• Reduced muscle spasm
• Increased tissue extensibility
• Increased blood flow
• Pain relief

Non-Thermal Effects (Pulsed SWD)

• Accelerated wound healing
• Reduced edema
• Enhanced collagen synthesis
• Nerve regeneration support
• Cell membrane effects

---

Indications of SWD

• Chronic musculoskeletal conditions (OA, chronic LBP, frozen shoulder)
• Subacute soft tissue injuries (pulsed mode)
• Sinusitis (continuous SWD over sinuses)
• Pelvic inflammatory disease (historical use)

Contraindications of SWD

• Metal implants = ABSOLUTE CONTRAINDICATION (metal heats rapidly = severe burns)
• Pacemakers (electromagnetic interference)
• Pregnancy (over abdomen/pelvis)
• Malignancy
• Hemorrhage / bleeding disorders
• Impaired sensation (cannot detect overheating)
• Wet dressings, plaster casts (moisture = uneven current = burns)
• Ischemic areas (cannot dissipate heat)
• Epiphyseal plates in children
• Testes (spermatogenesis temperature-sensitive)

---

TOPIC 6: MICROWAVE DIATHERMY (MWD)

Definition

• Microwave electromagnetic radiation for deep tissue heating
• Frequency: 2450 MHz (standard) or 915 MHz (deeper)
• Wavelength: 12.25 cm
• Penetration: approximately 3 cm (less than SWD)

Properties

• Selective heating of tissues with high water content
• Focused beam (directional, like a torch)
• More uniform heating than SWD
• Cannot be used directly over joints with synovial fluid (excessive joint heating)

Key Comparison: SWD vs. MWD

---

TOPIC 7: LASER THERAPY (LLLT)

Definition

• LASER = Light Amplification by Stimulated Emission of Radiation
• Low Level Laser Therapy (LLLT) = Cold Laser = Photobiomodulation
• Does NOT produce significant heat
• Wavelength: 600-1000 nm (red to near-infrared)

---

4 Unique Properties of Laser Light

1. Monochromatic: Single wavelength only (one pure color)
2. Coherent: All waves in same phase (synchronized, in step)
3. Collimated (Parallel): Beams travel parallel without diverging
4. High intensity: Concentrated energy in a narrow beam

---

Types Used in Physiotherapy

---

Biological Effects (Photobiomodulation)

• Stimulates mitochondria → increased ATP production
• Enhanced cell metabolism, collagen synthesis, fibroblast activity
• Reduced inflammation (reduced prostaglandins, bradykinin)
• Pain relief (altered nerve conduction, endorphin release)
• Wound healing acceleration
• Nerve regeneration support

Indications of LLLT

• Chronic wound healing (pressure sores, diabetic ulcers, leg ulcers)
• Soft tissue injuries (tendinopathy, sprains, strains)
• Post-herpetic neuralgia, peripheral neuropathy pain
• Trigger point treatment
• Lymphedema management
• Oral mucositis (in cancer patients)

Contraindications of LLLT

• Direct irradiation of the eye (retinal damage - BOTH patient AND therapist must wear goggles)
• Malignancy (promotes cell proliferation)
• Pregnancy (over abdomen/pelvis)
• Photosensitive skin conditions or photosensitizing medications
• Active hemorrhage
• Over thyroid gland and other endocrine glands
• Over epiphyseal plates in children

---

TOPIC 8: PHONOPHORESIS vs. IONTOPHORESIS

---

Iontophoresis in Detail

• Principle: Like charges repel → drug placed under same-polarity electrode → pushed into tissue
• Positive drug (lidocaine) → placed under anode → anode pushes positive drug in
• Negative drug (dexamethasone) → placed under cathode → cathode pushes negative drug in
• Current: 0.1-0.5 mA/cm² (very low)
• Acetic acid (negative): Treats calcium deposits (calcium + acetic acid → calcium acetate = soluble)
• Zinc ions (positive): Wound healing, bacteriostatic
• Hyaluronidase: Reduces scar tissue, fibrous adhesions

---

TOPIC 9: ELECTRICAL STIMULATION (NMES, FES, EMS)

NMES (Neuromuscular Electrical Stimulation)

• Stimulates intact peripheral nerves to produce muscle contraction
• Nerve is intact but muscle is weak (disuse atrophy, post-surgery)
• Uses medium pulse duration and frequency
• Used for:
  • Muscle strengthening post-surgery (knee, shoulder)
  • Muscle re-education after immobilization
  • Reduction of spasticity (via reciprocal inhibition)
  • Preventing disuse atrophy

FES (Functional Electrical Stimulation)

• Electrical stimulation synchronized to produce functional movements
• Replaces lost voluntary neuromuscular control
• Examples:
  • Drop foot stimulator (WalkAide, Bioness L300): Stimulates common peroneal nerve → dorsiflexion during swing phase
  • Spinal cord injury: standing, cycling programs
  • Stroke: upper limb grip and reach, drop foot correction
• FES differs from NMES in that it is task-specific and movement-synchronized

EMS for Denervated Muscle

• Used when peripheral nerve is damaged → cannot stimulate nerve → must stimulate muscle directly
• Requires long pulse duration (> 1 ms, often 10-100 ms) because denervated muscle has high chronaxie
• Low frequency (1-10 Hz) to prevent fatigue
• Purpose: Slow denervation atrophy, maintain muscle bulk during nerve regeneration
• Once nerve regenerates → switch to NMES

---

Galvanic (DC) Stimulation

• Direct current used for:
  • Iontophoresis (drug delivery)
  • Wound healing (promotes tissue repair)
  • EMS for severely denervated muscle
• Anode (positive pole): Sedative effect, vasoconstriction, reduces inflammation, bacteriostatic, hardening
• Cathode (negative pole): Stimulating effect, vasodilation, softening tissue, promotes healing

---

TOPIC 10: TRACTION

Definition

---

Cervical Traction

• Position: Slight flexion (15-25° forward) → opens posterior IVF → better for radiculopathy
• Force: 5-15 kg (practical), up to 25-50% body weight
• Disc herniation: Flexed position
• Facet joint problems: Neutral or slight extension
• Methods: Manual (therapist), mechanical (machine), self-traction (home)

Lumbar Traction

• Minimum effective force: 25-50% body weight to overcome friction and achieve disc separation
• Position: Hip and knee flexion (psoas relaxation, posterior IVF widening)
• Split table (frictionless) allows lower forces
• Pelvic belt used to apply force

---

Types of Traction

Static (Sustained) Traction

• Constant force for entire treatment session (15-30 minutes)
• Used for: disc herniation, nerve root compression
• Risk: muscle spasm from prolonged stretch

Intermittent Traction

• Alternating hold and rest phases (e.g., 30 seconds on, 10 seconds off)
• Better tolerated, reduces muscle spasm risk
• Used for: muscle spasm, joint hypomobility, disc conditions

Auto-Traction

• Patient controls force using own muscles
• Used for lumbar disc herniation

Gravity Traction

• Uses body weight (e.g., hanging from bar for cervical traction)

---

Indications of Traction

• Disc herniation with radiculopathy (nerve root compression)
• Cervical and lumbar spondylosis
• Muscle spasm
• Degenerative IVF narrowing
• Facet joint syndrome

Contraindications of Traction

• Cauda equina syndrome (surgical emergency - never traction)
• RA of cervical spine (ligament laxity → atlantoaxial subluxation risk)
• Osteoporosis (bone may fracture)
• Malignancy of spine (pathological fracture)
• Spinal cord compression / myelopathy
• Vertebral artery insufficiency (cervical traction)
• Pregnancy (lumbar traction over abdomen)
• Aortic aneurysm (abdominal compression)
• Acute disc with severe neurological deficit (relative)

---

TOPIC 11: HEAT THERAPY (THERMOTHERAPY)

Superficial Heat Agents

Infrared (IR) Radiation

• Electromagnetic radiation beyond visible red light
• Near IR (NIR): 0.78-1.5 μm; penetrates 3-10 mm; superficial dermis heating
• Far IR: 1.5-1000 μm; absorbed at skin surface
• Luminous (bright) lamp: Emits heat + light; penetrates deeper
• Non-luminous (dull) lamp: Emits heat only (longer wavelength); more superficial
• Lamp position: 45-60 cm from skin, 15-20 minutes

Moist Heat (Hydrocollator Packs)

• Canvas packs filled with silica gel, heated in water to ~70°C
• Applied with towel layers for 15-20 minutes
• Moist heat penetrates slightly better than dry heat
• Risk: burns if insufficient towel layers

Paraffin Wax Bath

• Mixture of paraffin wax + mineral oil in 7:1 ratio
• Temperature: 40-54°C (lower melting point due to oil addition)
• Methods:
  • Dip method: Dip 8-12 times, form glove, cover with bag + towel for 15-20 min
  • Immersion method: Keep hand submerged throughout treatment
  • Paint method: Brush onto body part (large/irregular areas)
• Excellent for: RA hands and feet, hand burns, joint stiffness, skin conditions
• Contraindications: open wounds, skin infections, impaired sensation

Fluidotherapy

• Dry heat using warm air blown through cellulose particles (warm "dry quicksand")
• Temperature: 38-47°C
• Unique: patient can EXERCISE during treatment
• Used for: distal extremities, wound debridement

---

Physiological Effects of Heat

• Vasodilation (increased blood flow, hyperemia)
• Increased metabolic rate (10% per 1°C rise)
• Increased tissue extensibility (collagen becomes more plastic → stretch DURING or AFTER heat)
• Muscle relaxation (reduces spasm)
• Pain relief (counter-irritation, reduced pain nerve conduction)
• Increased edema (in acute conditions = contraindicated)
• Sedation (parasympathetic activation)

Contraindications of Heat

• Acute inflammation (0-72 hrs) - increases edema, worsens condition
• Impaired sensation (burn risk)
• Impaired circulation (ischemia - cannot dissipate heat)
• Malignancy
• Bleeding disorders or anticoagulant therapy
• Metal implants (SWD and MWD only)
• Pregnancy (over relevant areas)

---

TOPIC 12: CRYOTHERAPY (COLD THERAPY)

Methods of Cold Application

• Ice packs (crushed ice in bag with towel protection)
• Ice massage (direct ice cube rubbing)
• Cold spray (ethyl chloride / Fluori-Methane)
• Ice bath / bucket immersion
• Cryo-cuff (compression + cold combined)
• Cold compression unit (Game Ready, Aircast)

---

Physiological Effects of Cold

Immediate Effects

• Vasoconstriction (reduces blood flow, limits acute edema)
• Reduced metabolic rate (reduces oxygen demand at injury site)
• Analgesia (slows nerve conduction velocity - C and Aδ fibers most affected)
• Reduced muscle spasm (cooling muscle spindle reduces gamma motor neuron activity)
• Reduced inflammation (reduced enzymatic activity)
• Reduced tissue bleeding

Hunting Reaction (Lewis Reaction)

• After prolonged cold (>15 minutes): alternating vasoconstriction and vasodilation
• Body's protective mechanism to prevent frostbite
• Vasodilation waves occur every 5-10 minutes

Cold-Induced Analgesia Sequence

1. Cold sensation
2. Burning / aching sensation
3. Numbness (analgesia) ← treatment goal (reached in 10-15 min)
4. Pain (extreme cold - danger zone - stop before this)

---

Indications of Cryotherapy

• Acute injuries (0-72 hrs) - cornerstone of PRICE protocol
• Post-exercise soreness (DOMS)
• Spasticity management (temporary tone reduction before exercise)
• Muscle spasm (acute)
• Post-operative swelling

Contraindications of Cryotherapy

• Raynaud's phenomenon / disease (cold triggers arterial vasospasm)
• Cold hypersensitivity / cold urticaria (allergic skin reaction to cold)
• Cryoglobulinemia (cold-precipitating proteins in blood)
• Peripheral vascular disease (impaired circulation)
• Impaired sensation (cannot detect frostbite)
• Open wounds (direct cold application)
• Cold intolerance conditions

---

Heat vs. Cold - Comparison

---

TOPIC 13: HYDROTHERAPY (ELECTROTHERAPY CONTEXT)

Whirlpool Bath

Temperature Ranges and Uses

Uses

• Wound debridement (gentle agitation removes necrotic tissue)
• Burn management (debridement)
• Edema reduction
• ROM improvement
• Pain relief and relaxation
• Peripheral vascular conditions

---

Contrast Bath

• Alternating immersion in warm and cold water
• Warm: 38-44°C; Cold: 15-18°C
• Typical ratio: 3 minutes warm : 1 minute cold (repeat 4-5 cycles)
• Start warm, end warm (if goal = stimulate circulation)
• Effect: alternating vasodilation and vasoconstriction = vascular pumping = edema reduction
• Used for: subacute injuries, peripheral circulatory conditions, chronic ankle swelling

---

TOPIC 14: WAVEFORMS AND SPECIAL CURRENTS

Russian Current (Kots Current)

• Carrier frequency: 2500 Hz AC
• Delivered in 10 ms ON / 10 ms OFF bursts at 50 Hz burst frequency
• Medium-frequency current → comfortable, low skin resistance
• Produces strong, comfortable muscle contractions
• Used for: muscle strengthening (post-surgery, sports rehabilitation, athletes)
• First described by Yakov Kots for Soviet Olympic athletes

---

High Voltage Pulsed Current (HVPC)

• High voltage: 100-500 V with very short pulse duration (< 200 μs)
• Monophasic twin-peak (twin-spiked) waveform
• Very short duration = comfortable despite high voltage
• Large current spread over body
• Positive pole: bacteriostatic effect
• Negative pole: promotes tissue healing
• Used for:
  • Wound healing
  • Edema reduction
  • Pain management

---

MENS (Microcurrent Electrical Neuromuscular Stimulation)

• Current levels: < 1000 μA (microampere range)
• Below threshold of sensation (patient feels nothing)
• Mimics the body's own bioelectric field
• Promotes wound healing by stimulating ATP production in cells
• Used for: non-healing wounds, fracture non-union, pain (particularly back pain)
• Popular in sports medicine and wound care

---

Galvanic Skin Response / Polar Effects of DC

Anode (Positive Pole) Effects

• Sedative
• Vasoconstriction
• Reduces inflammation (acute conditions)
• Bacteriostatic
• Hardening / firming of tissue

Cathode (Negative Pole) Effects

• Stimulating / excitatory
• Vasodilation
• Softens tissue (scar, adhesions)
• Promotes healing
• Higher risk of chemical burns if used incorrectly

---

TOPIC 15: ELECTROMAGNETIC SPECTRUM & UV THERAPY

Electromagnetic Spectrum in Physiotherapy

---

UV Therapy

Types

• UVA (320-400 nm): Long wave; used in PUVA therapy for psoriasis (Psoralen + UVA)
• UVB (280-320 nm): Medium wave; most used therapeutically; Vitamin D synthesis, psoriasis
• UVC (200-280 nm): Short wave; most germicidal/bactericidal; used for wound/ulcer treatment

---

UV Biological Effects

• Erythema (skin redness) - basis of dosimetry
• Pigmentation (tanning): UVA > UVB stimulates melanin production
• Vitamin D synthesis: UVB converts 7-dehydrocholesterol → previtamin D3 in skin
• Bactericidal effect: UVC most potent (used for open wounds, infected ulcers)
• Epidermal thickening (hyperkeratosis with repeated exposure)
• Immunosuppression locally (used in psoriasis - reduces T-cell activity)
• DNA damage and mutation risk (with excessive exposure → skin cancer risk)

---

UV Dosage - Minimal Erythema Dose (MED)

• MED is assessed on untreated skin (inner arm, abdomen)
• Subsequent doses: increase by 25-50% each session
• Always assess MED before starting UV course

---

Indications of UV

• Psoriasis (UVB narrowband, PUVA with UVA)
• Wound healing and infected wounds (UVC - bactericidal)
• Rickets / Vitamin D deficiency (UVB)
• Vitiligo (PUVA)
• Acne vulgaris (bactericidal effect of UVB/UVC)
• Pressure sores, leg ulcers (UVC)
• Seasonal Affective Disorder (SAD) (light therapy)

Contraindications of UV

• Acute sunburn (recent UV exposure - cumulative damage)
• Skin cancers, photosensitivity disorders
• Systemic Lupus Erythematosus (SLE) (photosensitive disease)
• Photosensitizing medications: tetracyclines, sulphonamides, psoralen, thiazide diuretics, phenothiazines
• Hyperthyroidism (increased metabolic rate)
• Pulmonary tuberculosis (active)
• Eyes must be covered throughout treatment - BOTH patient and therapist (UV-protective goggles)

---

COMPLETE QUICK-FIRE REVISION TABLE

Key Frequencies - MEMORIZE

Key Wavelengths

Mechanisms - One Line Each

• Conventional TENS = Gate control (Aβ fibers close gate in substantia gelatinosa)
• AL-TENS = Endorphin release from PAG (blocked by naloxone)
• US thermal = Tissue heating (continuous mode)
• US non-thermal = Cavitation + acoustic streaming (pulsed mode)
• SWD capacitive = Resistive heating (high water content tissues)
• SWD inductive = Eddy current heating (high conductivity tissues)
• IFT = Beat frequency produced internally; comfortable deep penetration
• Iontophoresis = DC drives ions (like charges repel)
• Phonophoresis = US disrupts skin barrier to drive neutral/ionized drugs
• LLLT = Photobiomodulation (mitochondrial ATP production)

Contraindications - Metal Implants

• SWD = ABSOLUTE contraindication (rapid metal heating = severe burns)
• MWD = ABSOLUTE contraindication
• US = Controversial / relative (avoid directly over metal)
• TENS = NOT a contraindication (safe around metal implants)
• IFT = NOT a contraindication (safe around metal)
• LASER = NOT a contraindication (safe around metal)

Important Values

• Paraffin wax temperature: 40-54°C
• Paraffin wax ratio: 7:1 (wax : mineral oil)
• Rheobase: minimum intensity at infinite pulse duration
• Chronaxie: pulse duration at 2× rheobase
• Normal nerve chronaxie: < 1 ms
• Denervated muscle chronaxie: > 10 ms
• Lumbar traction minimum force: 25-50% body weight
• Cervical traction position: 15-25° flexion
• BNR ideal: ≤ 6:1
• IFT best for edema: 25-50 Hz
• IFT best for pain: 50-100 Hz
• MED = minimum dose causing faint erythema at 8 hours
• UV dose E2 = 1 MED; E3 = 2.5 MED; E4 = 5 MED
• Duty cycle = ON/(ON + OFF) × 100%
• Metabolic rate increases 10% per 1°C temperature rise
• Contrast bath ratio: 3 min warm : 1 min cold

---

---

COMPLETE BIOMECHANICS NOTES FOR MPT ENTRANCE

---

TOPIC 1: FOUNDATIONS OF BIOMECHANICS

Definition

• Biomechanics = Application of mechanical principles to the study of biological systems (human body)
• Kinesiology = Study of human movement (broader term - includes biomechanics, anatomy, physiology)
• Statics = Study of bodies at rest or in equilibrium (forces balanced)
• Dynamics = Study of bodies in motion
  • Kinematics: Describes motion WITHOUT considering forces (what is happening)
  • Kinetics: Study of forces that CAUSE motion (why it is happening)

---

Types of Motion

Translatory (Linear) Motion

• All parts of a body move the same distance, in the same direction, at the same time
• Rectilinear: Motion in a straight line (e.g., person sliding on ice)
• Curvilinear: Motion along a curved path (e.g., projectile)

Rotatory (Angular) Motion

• Body moves in a circular path around a fixed axis (pivot point)
• All body segments move through the same angle in the same time
• Most joint movements in the body are rotatory
• Example: elbow flexion (forearm rotates around the elbow joint axis)

General Motion

• Combination of translatory and rotatory motion
• Example: walking (body as a whole translates forward while limbs rotate)

---

Planes and Axes of Motion

Planes

Axes

---

Degrees of Freedom (DOF)

• Number of independent directions of motion a joint can move
• 1 DOF: Hinge joint (elbow - only flexion/extension)
• 2 DOF: Condyloid joint (wrist - flexion/extension + abduction/adduction)
• 3 DOF: Ball and socket joint (shoulder, hip - movement in all 3 planes)

---

TOPIC 2: FORCES IN BIOMECHANICS

Definition of Force

• A push or pull acting on a body that tends to change its state of rest or motion
• Unit: Newton (N)
• Force is a vector quantity (has magnitude AND direction)

Types of Forces

External Forces

• Gravity: Acts downward through the center of gravity (COG); always present; must be overcome or controlled
• Ground Reaction Force (GRF): Reaction force from the floor (equal and opposite to force person puts on ground - Newton's 3rd law)
• Friction: Resistance to motion between two surfaces in contact

Internal Forces

• Produced by muscles, ligaments, tendons, joint capsules
• Muscle force: Most important internal force; produces joint torque
• Joint reaction force: Force transmitted through joint surfaces (compression or tension)

---

Newton's Laws of Motion

Newton's 1st Law (Law of Inertia)

• A body at rest stays at rest; a body in motion stays in motion in a straight line at constant speed - unless acted upon by an external force
• Inertia = resistance to change in state of motion
• Greater mass = greater inertia
• Clinical example: Starting to walk requires overcoming inertia of the body at rest

Newton's 2nd Law (Law of Acceleration)

• Force = Mass × Acceleration (F = ma)
• Greater force → greater acceleration
• Greater mass → less acceleration for same force
• Clinical example: Strengthening muscles increases force production → faster/stronger movement

Newton's 3rd Law (Law of Action-Reaction)

• For every action there is an equal and opposite reaction
• Example: When foot pushes down on ground → ground pushes up on foot (GRF)
• GRF is used in gait analysis

---

Moment of Force (Torque)

Definition

• Torque (Moment) = Force × Perpendicular distance from the axis (moment arm)
• T = F × d (where d = moment arm / lever arm)
• Unit: Newton-meter (Nm)
• Torque causes ROTATION around a joint axis

Moment Arm (Lever Arm)

• The perpendicular distance from the line of action of force to the axis of rotation
• Longer moment arm = greater torque for same force
• This is why muscles with longer moment arms are more efficient

---

Levers

Definition

• A rigid bar that rotates around a fixed point (fulcrum/axis)
• Three components:
  • Fulcrum (F): Pivot point (= joint)
  • Effort (E): Applied force (= muscle)
  • Resistance (R): Load being moved (= body weight or external load)

Classes of Levers

First-Class Lever (FAR - Fulcrum between force and resistance)

• Arrangement: R - F - E or E - F - R (fulcrum in MIDDLE)
• Example in body: Atlanto-occipital joint (head nodding - fulcrum at AO joint, neck muscles = effort, head weight = resistance)
• Also: Elbow extension (triceps) against gravity
• Seesaw arrangement
• Can have mechanical advantage > 1 or < 1 depending on lever arm lengths

Second-Class Lever (RAF - Resistance between fulcrum and effort)

• Arrangement: F - R - E (resistance in MIDDLE)
• Example in body: Calf raises (plantarflexion) - fulcrum = metatarsophalangeal joints, body weight = resistance, calf muscles = effort
• Wheelbarrow is classic example
• Always has mechanical advantage > 1 (effort arm > resistance arm)
• RARE in the body

Third-Class Lever (FRE - Effort between fulcrum and resistance)

• Arrangement: F - E - R (effort in MIDDLE)
• Example in body: Biceps curl - fulcrum = elbow joint, biceps force = effort (close to joint), hand weight = resistance (far from joint)
• Most common lever type in the human body
• Always has mechanical advantage < 1 (effort arm < resistance arm)
• Requires greater muscle force than the load BUT produces greater speed and range of movement
• Clinical significance: muscles must produce MORE force than external load due to short moment arm

Mechanical Advantage (MA)

• MA = Effort arm / Resistance arm
• MA > 1: Force advantage (less effort needed)
• MA < 1: Speed/range advantage (more effort needed but greater movement)
• Most body muscles: MA < 1 (third-class levers) → muscles work at a mechanical DISADVANTAGE but gain SPEED and RANGE

---

TOPIC 3: TORQUE AND JOINT MOMENTS

Calculating Torque Example

• Weight of forearm = 20 N acting at 15 cm from elbow axis
• Biceps force acts at 5 cm from elbow axis
• For equilibrium: Muscle torque = Resistance torque
• Biceps force × 5 cm = 20 N × 15 cm
• Biceps force = 300/5 = 60 N (3× the weight - muscle works at 3:1 disadvantage)

Torque and Exercise

• Gravity torque (resistance torque): Weight × distance from joint axis
• Highest gravity torque = at 90° joint angle (moment arm is longest when limb is horizontal)
• This is why an exercise feels hardest at 90° (e.g., mid-range of biceps curl)
• At 0° (limb hanging) and 180° (limb overhead): gravity torque approaches zero

---

TOPIC 4: JOINT MECHANICS AND ARTHROKINEMATICS

Types of Joint Motion

Osteokinematics

• Gross/visible movement of bones (what we see clinically)
• Described in degrees of ROM in anatomical planes
• Example: "knee flexes from 0° to 120°"

Arthrokinematics

• Movement of joint surfaces on each other (what happens inside the joint)
• Describes how the joint surfaces move relative to each other
• Types of joint surface motion:
  • Roll: One surface rolls over another (like a ball rolling on a floor - different contact points)
  • Slide (Glide): One surface translates over another (same contact point on one surface, different on other)
  • Spin: Rotation around a stationary mechanical axis (like a spinning top)
  • Distraction: Surfaces pulled apart (reduces compression)
  • Compression: Surfaces pushed together

---

Convex-Concave Rule (Kaltenborn) - VERY COMMONLY TESTED

The Rule

• Convex surface moving on fixed concave surface: Roll and glide occur in OPPOSITE directions
• Concave surface moving on fixed convex surface: Roll and glide occur in the SAME direction

Clinical Applications

Shoulder (Glenohumeral Joint)

• Humeral head = convex; Glenoid = concave
• During arm abduction (humerus rolls SUPERIORLY):
  • Humeral head must glide INFERIORLY (opposite to roll = convex rule)
  • This prevents the humeral head from riding up and impinging under acromion
• Loss of inferior glide → restricted abduction → treat with inferior glide mobilization

Knee (Tibiofemoral - Open Chain)

• Femoral condyles = convex; Tibial plateau = concave
• During knee flexion (tibia concave moves): tibia rolls posteriorly AND glides posteriorly (same = concave rule)
• During knee extension (tibia concave moves): tibia rolls anteriorly AND glides anteriorly

Hip Joint

• Femoral head = convex; Acetabulum = concave
• During hip flexion (femur moves, convex head on fixed acetabulum): femoral head rolls anteriorly, glides POSTERIORLY (opposite = convex rule)
• Loss of posterior glide → restricted hip flexion

Subtalar Joint (Calcaneus on Talus)

• Calcaneus (concave) on Talus (convex)
• During inversion: calcaneus rolls and glides in same direction (concave rule)

---

Joint Reaction Force (JRF)

• Compressive force across the joint surface during loading
• Greater than just body weight above the joint (due to muscle forces adding compression)
• Hip example: During single-leg stance, JRF at hip ≈ 2.5-3× body weight
• Knee during stair climbing: JRF ≈ 3-4× body weight
• This explains why weight loss significantly reduces joint load in OA

---

Center of Gravity (COG) and Base of Support (BOS)

Center of Gravity

• Point where body weight is concentrated (resultant of all gravity forces)
• In anatomical position: approximately S2 level (anterior to second sacral segment)
• Women: slightly lower COG than men (wider pelvis, heavier lower extremities)
• COG changes with body position

Line of Gravity (LOG)

• Vertical line from COG to ground
• Must fall within Base of Support for stability

Base of Support (BOS)

• Area enclosed by the outer edges of all body parts in contact with the ground
• Stability increases when:
  • LOG is closer to CENTER of BOS
  • BOS is LARGER
  • COG is LOWER
  • Body mass is greater
• Examples:
  • Standing wide feet > standing narrow feet (wider BOS)
  • Sitting > standing (lower COG, wider BOS)
  • Using walking frame > walking stick > no aid (larger BOS)

---

TOPIC 5: STRESS, STRAIN AND MATERIAL PROPERTIES

Stress

• Stress (σ) = Force / Area (F/A)
• Unit: Pascal (Pa) or N/m²
• Internal resistance of a material to external force
• Types:
  • Compressive stress: Force pushes surfaces together (axial loading of vertebra)
  • Tensile stress: Force pulls surfaces apart (stretching a ligament)
  • Shear stress: Force acts parallel to surface (intervertebral disc during forward bending)
  • Bending stress: Combination of tension on one side and compression on the other (bone under bending load)
  • Torsional stress: Twisting force (rotational load on tibia in skiing injury)

Strain

• Strain (ε) = Change in length / Original length (ΔL/L)
• Dimensionless (no unit) or expressed as %
• Deformation of material in response to stress
• Tensile strain: Elongation
• Compressive strain: Shortening

Stress-Strain Curve (Load-Deformation Curve) - VERY IMPORTANT

Stress
 |        /Ultimate stress
 |       /
 |      / ← Plastic region (permanent deformation)
 |     /
 |----/ ← Yield point (elastic limit)
 |   |
 |  / ← Elastic region (returns to original length)
 | /
 |/____________
        Strain

Regions of Stress-Strain Curve

Toe Region (Crimp Region)

• Initial flat/curved part before the linear region
• Collagen fibers straighten (uncrimping)
• Present in ligaments and tendons
• Very little force needed for initial elongation

Linear (Elastic) Region

• Stress-strain is linear (Hooke's Law applies)
• Elastic behavior: Material returns to original shape when force is removed
• Stiffness = Slope of linear region (steeper = stiffer material)
• Normal physiological loading occurs here

Yield Point (Elastic Limit)

• Point at which permanent deformation begins
• Beyond here: material does not fully recover
• In biological tissue: micro-failure begins (Grade I muscle/ligament strain)

Plastic Region

• Permanent (plastic) deformation occurs
• Material is permanently changed
• Corresponds to Grade II/III injury in soft tissue

Failure Point (Ultimate Stress / Rupture)

• Material completely fails (ruptures)
• Complete tear of ligament, tendon, or fracture of bone

Hooke's Law

• Within the elastic region: Stress is proportional to Strain
• σ = E × ε (where E = Young's Modulus = Elastic Modulus)
• E = Stiffness of the material
• Higher E = stiffer material (steel vs. rubber)

---

Viscoelastic Properties of Biological Tissue

Viscoelasticity

• Biological tissues (ligaments, tendons, cartilage, muscle) behave as both elastic AND viscous materials
• Elastic behavior: Store energy and return to original shape
• Viscous behavior: Time-dependent deformation (slow response)

Creep

• Gradual deformation under CONSTANT LOAD over time
• Example: Intervertebral disc height decreases during the day under constant body weight load
• Height recovery overnight when load is removed
• Clinical: people are ~1-2 cm taller in the morning than at night

Stress Relaxation

• Decrease in stress (force) over time when CONSTANT DEFORMATION is maintained
• Example: When you stretch a muscle to a fixed position, the resistance force decreases over time
• Basis of static stretching (hold stretch → force in tissue decreases → safer to hold)

Hysteresis

• Energy loss during loading and unloading cycle
• The loading curve and unloading curve are different (unloading is below loading)
• Area between curves = energy dissipated as heat
• Biological tissues always show hysteresis
• More hysteresis = more energy lost (less efficient spring)

Rate Dependency (Strain Rate Sensitivity)

• Stiffer and stronger at high strain rates (fast loading)
• More compliant at low strain rates (slow loading)
• Clinical: slow gentle stretching is safer (allows creep and stress relaxation to reduce injury risk)
• Sudden jerky movements (high strain rate) = higher injury risk (tissue stiffer, less time to deform)

---

TOPIC 6: PROPERTIES OF SPECIFIC TISSUES

Bone Biomechanics

Composition

• Cortical (compact) bone: Dense outer shell; 80% of skeleton by weight; high stiffness, resists compression well
• Cancellous (trabecular) bone: Spongy inner structure; absorbs energy (shock absorption); aligns along stress lines (Wolff's Law)

Wolff's Law

• Bone remodels in response to mechanical stresses placed upon it
• Bone is laid down along lines of stress (trabecular alignment follows loading direction)
• Disuse → bone resorption (osteopenia); Increased loading → bone formation
• Clinical: Weight-bearing exercise prevents osteoporosis

Bone Loading

• Bone is strongest in compression (resists compression best)
• Bone is weakest in tension (fails first on tension side during bending)
• Most fractures occur from combination of forces (bending = tension + compression; torsion = shear)
• Stress fractures: Result of repetitive sub-failure loading → micro-damage accumulates faster than remodeling repairs it

Bone Stiffness Values (Approximate)

• Young's modulus of cortical bone: ~17-20 GPa
• Much stiffer than soft tissue (ligament ~1-2 GPa; cartilage ~0.5-1 GPa)

---

Cartilage Biomechanics

Types

• Hyaline cartilage: Covers joint surfaces (articular cartilage); 65-80% water
• Fibrocartilage: Menisci, intervertebral discs; more collagen, stronger in tension
• Elastic cartilage: Ear, epiglottis

Articular Cartilage Properties

• Avascular, aneural, alymphatic
• Nutrition via diffusion from synovial fluid (compression-relaxation pumps fluid in and out)
• Biphasic model: Fluid phase + solid phase
  • Fluid phase: Water and ions (65-80% by weight); carries most of compressive load initially
  • Solid phase: Collagen (mainly Type II) + proteoglycans (aggrecan) - resists tension

Response to Loading (Biphasic Behavior)

• Acute compression: Fluid pressurized → fluid load sharing protects solid matrix → interstitial fluid carries load → high stiffness
• Sustained compression: Fluid slowly exudes → more load on solid matrix → deformation over time (creep)
• Important: Cartilage needs intermittent loading for nutrition; prolonged immobility → cartilage degeneration

---

Intervertebral Disc (IVD) Biomechanics

Structure

• Nucleus Pulposus (NP): Central gel-like core; 80% water; distributes load hydrostatically (like a ball bearing)
• Annulus Fibrosus (AF): Outer fibrocartilaginous rings (15-20 layers); collagen fibers at 30° angle alternating (±30°) to resist torsion and bending
• End Plates: Thin cartilage plates attaching disc to vertebral bodies; nutrition route

Loading Responses

• Compression: NP pressurized → load distributed uniformly → AF under tension (hoop stress)
• Flexion: Anterior AF under compression, posterior AF under tension → NP migrates POSTERIORLY (disc herniation mechanism in flexion loading)
• Extension: Opposite → NP migrates ANTERIORLY (explains McKenzie extension for posterior herniation)
• Torsion: AF most vulnerable (collagen fibers alternate direction; only half resist each direction)
• Flexion + Rotation: Most dangerous loading combination for disc

Intradiscal Pressure Values (Nachemson's Studies)

---

Ligament Biomechanics

Properties

• Connects bone to bone
• Primarily Type I collagen fibers arranged parallel to lines of stress
• Crimped structure (wavy arrangement) → toe region in stress-strain curve
• Small amounts of elastin (gives some elastic return)
• Vascular (unlike cartilage) but healing is slow (collagen remodeling takes months)

Ligament Healing

• Ligament healing is slower than muscle (less vascularity)
• After complete tear: scar tissue forms (not original collagen)
• Scar collagen is less organized → weaker than original ligament
• PEACE & LOVE protocol (modern): Protection, Elevation, Avoid anti-inflammatory modalities, Compression, Education → Load, Optimism, Vascularization, Exercise

Mechanical Behavior

• Toe region: uncrimping of collagen
• Linear region: elastic deformation
• Micro-failure at yield point (Grade I/II sprain)
• Complete failure at ultimate stress (Grade III sprain)

---

Tendon Biomechanics

Properties

• Connects muscle to bone
• Primarily Type I collagen (more than ligaments)
• Stiffer than ligaments
• Functions: transmit muscle force to bone, store elastic energy (spring mechanism)

Elastic Energy Storage

• Achilles tendon is best example of elastic energy storage
• During landing: tendon stretches (stores energy like a spring)
• During push-off: tendon recoils (releases stored energy) → reduces metabolic energy cost of running
• Achilles can store and return ~35% of energy per stride

Tendon Injury (Tendinopathy)

• Repetitive overloading → collagen breakdown (Type I → Type III collagen)
• Type III collagen is weaker and less organized
• Treatment: Eccentric exercise → stimulates Type I collagen remodeling

---

TOPIC 7: BIOMECHANICS OF SPECIFIC JOINTS

Shoulder Complex Biomechanics

Scapulohumeral Rhythm

• Ratio of glenohumeral to scapulothoracic motion: 2:1
• For every 3° of total shoulder abduction:
  • 2° occurs at the Glenohumeral (GH) joint
  • 1° occurs at the Scapulothoracic (ST) joint
• Full shoulder abduction = 180°
  • GH joint contributes: 120°
  • ST joint (scapular rotation) contributes: 60°
• First 30° of abduction: predominantly GH motion (scapula stabilizing)
• After 30°: scapula begins to rotate upwardly (serratus anterior + upper/lower trapezius)

Clinical Significance of Scapulohumeral Rhythm

• Disruption → SICK scapula syndrome (Scapular malposition, Inferior medial border prominence, Coracoid pain, dysKinesis)
• In shoulder impingement: scapular dyskinesis reduces subacromial space → impingement
• Physiotherapy: scapular stabilization exercises crucial (lower trapezius, serratus anterior)

Force Couple at Glenohumeral Joint

• Deltoid pulls the humerus superiorly (tends to cause superior migration)
• Rotator cuff (especially infraspinatus + subscapularis) pulls the humeral head INFERIORLY and compresses it into glenoid
• These two forces form a force couple → keeps humeral head centered in glenoid during abduction
• Rotator cuff tear → force couple disrupted → humeral head rides up (impingement)

Force Couple at Scapula

• Upper trapezius + Lower trapezius + Serratus anterior = force couple for scapular upward rotation
• Loss of any component → poor scapular control → impingement + shoulder pain

---

Hip Joint Biomechanics

Forces at Hip During Single-Leg Stance

• Body weight acts downward through COG (medial to hip joint)
• Hip abductors (gluteus medius) must contract to prevent pelvis from dropping
• Moment equilibrium at hip:
  • Body weight × distance from hip joint = Gluteus medius force × its moment arm
  • Since body weight moment arm >> gluteus medius moment arm:
  • Hip abductor force ≈ 2× body weight just to maintain equilibrium
• Total hip joint reaction force = body weight + abductor force ≈ 2.5-3× body weight

Walking Stick and Hip

• Walking stick in OPPOSITE (contralateral) hand to painful hip
• This reduces the body weight moment → gluteus medius needs less force → hip joint force DECREASES
• Using stick on SAME side is less effective (just acts as a third leg)

Trendelenburg Sign Mechanics

• Weak gluteus medius cannot generate adequate abductor moment
• Pelvis drops on swing (opposite) side
• Compensated: patient leans torso over weak hip → moves COG closer to hip axis → reduces abductor moment arm demand

---

Knee Joint Biomechanics

Tibiofemoral Joint

• Modified hinge joint with slight rotation (screw home mechanism)
• Screw Home Mechanism (Terminal Rotation):
  • As knee extends from ~20° → 0° (full extension), tibia externally rotates (~5-10°)
  • This "locks" the knee in extension (maximally congruent position = closed packed position)
  • Unlocking: Popliteus muscle internally rotates tibia → "unlocks" knee from full extension
• Q Angle (Quadriceps Angle):
  • Angle between line from ASIS to patella center AND line from patella center to tibial tuberosity
  • Normal: Males = 10-15°; Females = 15-20°
  • Increased Q angle → lateral pull on patella → patellofemoral problems, lateral patellar tracking

Patellofemoral Joint

• Patellofemoral Joint Reaction Force (PFJRF):
  • Increases with knee flexion angle
  • Walking: PFJRF ~0.5× body weight
  • Stairs: ~3.3× body weight
  • Deep squats: ~7-8× body weight
  • Clinical: avoid deep squatting in patellofemoral pain; exercises in low flexion range
• Patella function: Increases moment arm of quadriceps → increases extensor torque by ~30-50%

ACL Biomechanics

• Primary restraint to anterior tibial translation
• Resists internal rotation of tibia
• Maximum stress: knee flexion 15-30° (explains why Lachman test at 20-30° flexion)
• Two bundles: Anteromedial (AM) - taut in flexion; Posterolateral (PL) - taut in extension
• ACL failure mechanism: combined anterior tibial shear + valgus + internal rotation (typical ACL injury mechanism)

Meniscus Function

• Shock absorption (distributes load over larger area - reduces contact stress by 50%)
• Joint lubrication (spreads synovial fluid)
• Proprioception (mechanoreceptors in meniscus)
• Joint stability (secondary stabilizer)
• Medial meniscus: Larger C-shape, less mobile (attached to MCL) → more commonly injured
• Lateral meniscus: Smaller O-shape, more mobile → less commonly injured but faster-moving loads injure it

---

Lumbar Spine Biomechanics

Vertebral Column Functions

• Weight bearing (axial load transmission)
• Shock absorption (IVD)
• Movement (motion segments)
• Spinal cord and nerve root protection

Motion Segment

• Functional unit = two adjacent vertebrae + IVD between them + all soft tissue connections
• Each motion segment allows small amounts of movement; cumulative = large spinal ROM

Facet Joint Orientation

• Lumbar facets: Oriented in SAGITTAL plane → allow flexion/extension, limit rotation
• Thoracic facets: Oriented in FRONTAL plane → allow rotation, limit flexion/extension
• Cervical facets: Angled at 45° → allow all movements

Lumbar Spine Stability (Panjabi's Model)

1. Passive system: Vertebrae, IVDs, ligaments (provide stability at end range)
2. Active system: Muscles and tendons (provide dynamic stability through range)
3. Neural control system: Nervous system coordinates the active system

Instability

• Increased neutral zone = spinal instability (ligaments fail to provide end-range stability)
• Treatment: strengthen the active muscle system (core stability training)

---

Foot and Ankle Biomechanics

Foot Arches

• Medial longitudinal arch: Calcaneus → navicular → 3 cuneiforms → 1st, 2nd, 3rd metatarsals; Primary arch for weight bearing; maintained by plantar fascia (windlass mechanism), tibialis posterior, intrinsic foot muscles
• Lateral longitudinal arch: Calcaneus → cuboid → 4th, 5th metatarsals; less pronounced, more rigid
• Transverse arch: Across metatarsal heads

Windlass Mechanism

• Dorsiflexion of toes tightens the plantar fascia → raises the medial longitudinal arch → supinates the foot → converts foot to rigid lever for push-off
• Critical for normal push-off in gait
• Disruption (plantar fasciitis) → impairs push-off mechanics

Subtalar Joint (Talocalcaneal)

• Pronation (Eversion): Abduction + Eversion + Dorsiflexion - "unlocks" midfoot → flexible for shock absorption
• Supination (Inversion): Adduction + Inversion + Plantarflexion - "locks" midfoot → rigid lever for push-off
• Normal: Pronates at heel strike (absorbs impact); Supinates at toe-off (propulsion)

Pes Planus (Flat Foot)

• Loss of medial longitudinal arch
• Excessive pronation throughout stance
• Causes: tibialis posterior dysfunction, ligament laxity, obesity
• Consequences: increased medial stress → tibial stress fractures, plantar fasciitis, patellofemoral pain (through tibial IR)

Pes Cavus (High Arch)

• Exaggerated medial arch
• Rigid foot, poor shock absorption
• Associated: neurological conditions (Charcot-Marie-Tooth disease)
• Increased lateral stress → lateral ankle sprains, metatarsal stress fractures

---

TOPIC 8: BIOMECHANICS OF POSTURE

Center of Gravity in Standing

• Location: ~S2 level, approximately 55-57% of height from the ground
• Women: slightly lower COG (wider hips, heavier lower extremity)
• Older adults: COG tends to shift forward (forward head, kyphosis)

Static Postural Analysis - Plumb Line

• Earlobe → Shoulder (acromion) → Greater trochanter → Just anterior to lateral knee → Lateral malleolus (anterior)

Postural Muscle Activity in Quiet Standing

• Very little muscle activity in relaxed standing (minimal energy cost)
• Muscles active in LOW-LEVEL bursts: Tibialis anterior, gastrocnemius, gluteus medius, iliopsoas
• Postural sway: COG constantly moves within BOS (normal postural sway)
• Sway increases: fatigue, alcohol, vestibular disorders, peripheral neuropathy, old age

Postural Deviations and Biomechanical Consequences

Kyphosis-Lordosis Posture

• Increased thoracic kyphosis + increased lumbar lordosis + forward head + anterior pelvic tilt
• Tight: hip flexors, lumbar extensors, pectorals, upper trapezius
• Weak: abdominals, gluteals, deep neck flexors, rhomboids
• Consequences: Increased compressive load on thoracic vertebrae anteriorly, facet joint overloading in lumbar spine

Flat Back Posture

• Reduced lumbar lordosis, posterior pelvic tilt
• Tight: hamstrings
• Weak: hip flexors
• Consequences: Increased posterior disc stress, hamstring tightness, poor shock absorption

Sway Back Posture

• Hip shifted forward, trunk shifted back, lumbar kyphosis/flat, knee hyperextension
• Different from kyphosis-lordosis

---

TOPIC 9: BIOMECHANICS OF GAIT

Ground Reaction Force (GRF) During Gait

Vertical GRF (Most Important)

• Characteristic double-hump pattern during walking:
  • First peak (~120% body weight): Loading response (heel strike to foot flat)
  • Valley (~80% body weight): Mid-stance (single limb support)
  • Second peak (~110% body weight): Terminal stance / push-off
• Running: Single peak, much higher (2-3× body weight)
• GRF in walking creates external flexion moment at knee → quadriceps must work to resist it

Mediolateral GRF

• Small, directed laterally then medially
• Resisted by hip abductors and adductors

Anteroposterior GRF

• Braking force: Directed posteriorly at heel strike (decelerates forward motion)
• Propulsive force: Directed anteriorly at push-off (accelerates forward motion)

---

Energy Cost of Gait

Walking Efficiency

• Normal walking: most energy-efficient pace (preferred self-selected walking speed ~1.2-1.4 m/s)
• Walking too slow or too fast increases energy cost per distance
• COG follows a smooth sinusoidal path (6 determinants of gait minimize COG displacement = minimize energy)

6 Determinants of Gait (Saunders, Inman, Eberhart)

1. Pelvic rotation (forward rotation of pelvis ~4° each step - lengthens step and smooths COG path)
2. Pelvic tilt (list) (~5° drop on swing side - lowers COG at mid-stance)
3. Knee flexion in stance (15-20° at loading response - reduces COG rise at mid-stance)
4. Ankle-foot mechanism (plantarflexion at heel rise extends apparent limb length)
5. Knee-foot mechanism (coordinates knee flexion + ankle plantarflexion at toe-off)
6. Lateral pelvic displacement (~5 cm total) - keeps COG directly over stance foot

---

TOPIC 10: BIOMECHANICS OF LIFTING

Safe Lifting Biomechanics

Why Bent-Spine Lifting is Dangerous

• Flexing the spine forward greatly increases the moment arm of the upper body weight from L5-S1
• L5-S1 erector spinae force calculation example:
  • Upper body weight = 400 N acting at 30 cm anterior to L5-S1
  • Erector spinae moment arm from L5-S1 ≈ 5 cm (very short)
  • For equilibrium: Erector spinae force × 5 = 400 × 30
  • Erector spinae force = 2400 N (6× body weight)
  • Plus compressive force on L5-S1 disc = 2400 + 400 = 2800 N
• Adding weight to be lifted: disc compression can exceed 3000-6000 N
• Failure load of lumbar disc = ~5000 N (explains lifting injuries)

Proper Lifting Technique

• Keep load close to body (reduces external moment arm dramatically)
• Use squat lift (knee and hip flexion - shifts load to lower limb joints)
• Maintain neutral lumbar lordosis (protects disc)
• Engage core before lifting (increases intra-abdominal pressure = splinting effect)
• Avoid combined flexion + rotation (most dangerous for disc)

Intra-Abdominal Pressure (IAP)

• When abdominal muscles contract → IAP rises → creates a hydraulic cylinder effect
• Reduces compressive load on lumbar spine by ~30-40%
• Valsalva maneuver dramatically increases IAP (used in powerlifting but risky for cardiovascular system)

---

TOPIC 11: WORK, POWER, AND ENERGY

Mechanical Work

• Work (W) = Force × Displacement (in direction of force)
• W = F × d
• Unit: Joule (J)
• Work is done ONLY when force causes displacement
• Isometric contraction: Force produced but NO displacement → Zero mechanical work

Power

• Power (P) = Work / Time = Force × Velocity
• P = W/t = F × v
• Unit: Watt (W)
• Rate of doing work
• A strong but slow muscle may have less power than a weaker but faster muscle
• Muscle power depends on both force AND velocity

Energy

• Potential Energy (PE): Stored energy due to position (PE = mgh)
  • Higher position = greater PE
  • Example: Raised arm has more PE than arm at side
• Kinetic Energy (KE): Energy of motion (KE = ½mv²)
  • Faster movement = greater KE
  • Example: Running limb has more KE than walking limb
• Elastic Potential Energy: Stored in stretched elastic structures (tendons, ligaments)

Conservation of Energy

• Total mechanical energy = KE + PE (constant in frictionless system)
• Pendulum model of walking: COG converts KE to PE and back alternately during each step
• Accounts for ~60-70% of walking efficiency

---

TOPIC 12: FRICTION

Definition

• Resistance force opposing relative motion between two surfaces
• Static friction: Prevents motion from starting (maximum just before sliding begins)
• Kinetic (sliding) friction: Acts during sliding motion (less than static friction)

Coefficient of Friction (μ)

• μ = Friction Force / Normal Force
• Dimensionless constant (depends on surface materials)
• High μ = high friction (rubber on concrete)
• Low μ = low friction (synovial joint = μ ~0.001-0.003 - extremely low)

Clinical Applications of Friction

• Joint lubrication: Synovial joints have extremely low friction (hyaluronic acid + lubricin + cartilage surface)
• Walking: Adequate friction between shoe and ground prevents slipping
• Traction: Friction between body and table must be overcome for lumbar traction effectiveness
• Manual therapy: Friction massage (Cyriax) - deliberately uses friction to break adhesions

---

TOPIC 13: FLUID MECHANICS (BASICS)

Viscosity

• Resistance of a fluid to flow
• High viscosity: thick fluid (honey, synovial fluid in OA)
• Low viscosity: thin fluid (water)
• Synovial fluid viscosity decreases with activity (thixotropic behavior) → explains morning stiffness (fluid thickens at rest overnight)

Buoyancy (Archimedes' Principle)

• Already covered in exercise therapy notes
• Relevant to hydrotherapy

Bernoulli Effect

• As fluid velocity increases, pressure decreases
• Relevant to respiratory mechanics (airflow in bronchi)

---

TOPIC 14: PRESSURE

Definition

• Pressure = Force / Area
• Unit: Pascal (Pa) = N/m²
• Same force over smaller area = greater pressure (explains injury from sharp objects)

Clinical Applications

Interface Pressure (Seating/Lying)

• Pressure ulcers: Form when interface pressure exceeds capillary closing pressure (~32 mmHg)
• Areas at risk: sacrum, greater trochanter, heel, occiput
• Pressure relief: Regular position changes, pressure-relieving cushions/mattresses (ROHO, viscoelastic foam)
• Time + pressure = ischemic necrosis

Intraarticular Pressure

• Normal synovial joint: slightly negative pressure (~-5 mmHg) → keeps joint surfaces together
• Joint effusion → positive pressure → pain + limited ROM

Intraabdominal Pressure (IAP)

• Generated by contraction of abdominal wall + pelvic floor + diaphragm
• Stabilizes lumbar spine (discussed in lifting section)

---

TOPIC 15: BIOMECHANICS OF FRACTURES

Mechanism of Fracture

By Force Type

• Compression: Vertebral body compression fractures (axial load)
• Tension (Avulsion): Ligament or tendon pulls off bony fragment (tibial tuberosity avulsion)
• Bending: Creates tension on convex side, compression on concave side - bone fails on tension side first
• Torsion (Spiral fracture): Twisting force creates shear stress → spiral fracture line
• Combined: Most common (fall = bending + compression + torsion)

Stress Fractures

• Repetitive sub-maximal loading → micro-damage faster than bone remodeling
• Common sites: 2nd metatarsal (march fracture), tibia, femoral neck
• Risk factors: Training errors, female athlete triad, vitamin D deficiency

Energy Absorption

• Bone can absorb energy = area under load-deformation curve
• High-energy fractures (car accident): More comminution, more soft tissue damage
• Low-energy fractures (fall in elderly): Simpler pattern but may indicate osteoporosis

---

QUICK-FIRE REVISION - BIOMECHANICS

Key Definitions

• Kinematics = describes motion (what) without forces
• Kinetics = forces that cause motion (why)
• Torque = Force × moment arm (causes rotation)
• Stress = Force / Area
• Strain = Change in length / Original length
• Stiffness = Stress / Strain (slope of linear region)

Planes and Motions

• Sagittal plane = flexion / extension
• Frontal plane = abduction / adduction
• Transverse plane = rotation
• Axis is PERPENDICULAR to plane

Lever Classes

• 1st class (FAR): Fulcrum in middle (head nodding)
• 2nd class (RAF): Resistance in middle (calf raise) - rare in body
• 3rd class (FRE): Effort in middle (biceps curl) - most common in body

Key Ratios and Values

• Scapulohumeral rhythm = 2:1 (GH:ST)
• Full abduction: GH = 120°, ST = 60°
• Q angle: Males = 10-15°, Females = 15-20°
• Hip JRF in single-leg stance = 2.5-3× body weight
• Knee JRF on stairs = 3-4× body weight
• Disc pressure highest in: sitting + flexion + holding load
• COG in standing: S2 level (~55% of height)
• Capillary closing pressure = ~32 mmHg
• Synovial joint coefficient of friction = ~0.001-0.003

Convex-Concave Rule (One line)

• Convex moves on concave → Roll and glide OPPOSITE directions
• Concave moves on convex → Roll and glide SAME direction

Viscoelastic Properties

• Creep = deformation under CONSTANT LOAD over time
• Stress relaxation = force decreases under CONSTANT DEFORMATION over time
• Hysteresis = energy loss during loading/unloading cycle
• High strain rate = stiffer (fast jerky = more injury risk)
• Low strain rate = more compliant (slow gentle = safer stretching)

Disc Pressure Order (Low to High)

• Lying < Standing < Sitting < Sitting with lean < Lifting with straight back < Lifting with bent spine (highest)

Gait GRF

• Double-hump pattern in walking (vertical)
• First peak = loading response (120% BW)
• Valley = mid-stance (80% BW)
• Second peak = push-off (110% BW)

Important Laws

• Wolff's Law: Bone remodels along lines of stress
• Hooke's Law: Stress proportional to strain (in elastic region)
• Newton's 2nd Law: F = ma
• Newton's 3rd: Equal and opposite reaction (GRF)
• Archimedes: Buoyancy = weight of fluid displaced

---

---

COMPLETE NEUROLOGY NOTES FOR MPT ENTRANCE

---

TOPIC 1: NEUROANATOMY FOUNDATIONS

Organization of the Nervous System

Central Nervous System (CNS)

• Brain + Spinal cord
• Protected by: skull, vertebral column, meninges (dura mater, arachnoid, pia mater), CSF

Peripheral Nervous System (PNS)

• All nerves outside CNS
• Somatic PNS: Voluntary (skeletal muscle control + sensory)
• Autonomic PNS: Involuntary (smooth muscle, cardiac muscle, glands)
  • Sympathetic: "Fight or flight" (thoracolumbar outflow T1-L2)
  • Parasympathetic: "Rest and digest" (craniosacral outflow CN III, VII, IX, X + S2-S4)

---

Meninges

• Dura mater: Outermost, tough, fibrous
  • Epidural space: Between dura and bone (contains fat + veins)
  • Subdural space: Between dura and arachnoid (potential space)
• Arachnoid mater: Middle, web-like
  • Subarachnoid space: Between arachnoid and pia; contains CSF
• Pia mater: Innermost, closely adherent to brain/cord

Meningitis

• Inflammation of meninges
• Classic signs: Fever + headache + neck stiffness (meningism)
• Kernig's sign: Knee cannot be fully extended when hip is flexed 90° (stretches inflamed meninges)
• Brudzinski's sign: Passive neck flexion causes involuntary hip and knee flexion

---

Cerebrospinal Fluid (CSF)

• Produced by choroid plexus in lateral ventricles (mainly)
• Total volume: ~150 mL
• Circulation: Lateral ventricles → 3rd ventricle → cerebral aqueduct (of Sylvius) → 4th ventricle → subarachnoid space → reabsorbed at arachnoid villi / granulations
• Normal CSF pressure: 70-180 mmH₂O
• Normal CSF: clear, colorless, glucose 60% of plasma glucose, protein 15-45 mg/dL
• Hydrocephalus: CSF accumulation → raised ICP
  • Communicating: Impaired reabsorption (e.g., post-meningitis)
  • Non-communicating (obstructive): Blocked within ventricular system

---

Blood-Brain Barrier (BBB)

• Formed by: tight junctions between cerebral capillary endothelial cells + astrocyte foot processes
• Prevents most substances from entering brain except:
  • Fat-soluble molecules (alcohol, anesthetics)
  • Gases (O₂, CO₂)
  • Glucose (via specific transporter)
  • Amino acids (essential ones)
• Areas WITHOUT BBB: Hypothalamus, Area postrema (vomiting center), Pineal gland, Posterior pituitary

---

TOPIC 2: BRAIN ANATOMY AND FUNCTIONS

Cerebral Cortex - Lobes and Functions

Frontal Lobe

• Primary Motor Cortex (Precentral gyrus - Area 4): Controls voluntary movement of contralateral body
• Premotor Cortex (Area 6): Plans and initiates movements; stores motor programs
• Supplementary Motor Area (SMA): Bilateral; planning of complex sequential movements
• Broca's Area (Area 44, 45 - Left hemisphere, inferior frontal gyrus): Motor (expressive) speech production
  • Damage → Broca's aphasia: Non-fluent speech, understands language, frustrated
• Prefrontal Cortex: Executive functions, personality, working memory, judgment, social behavior
  • Damage → personality change, poor judgment, disinhibition (Phineas Gage example)
• Frontal Eye Fields (Area 8): Voluntary conjugate eye movements (gaze to contralateral side)
  • Damage → eyes deviate TOWARD the lesion side

Parietal Lobe

• Primary Somatosensory Cortex (Postcentral gyrus - Areas 3, 1, 2): Receives sensory input from contralateral body
• Sensory Association Area: Integrates sensory information for complex perception
• Wernicke's Area (Area 22 - Left hemisphere, posterior superior temporal + parietal): Language comprehension
  • Damage → Wernicke's aphasia: Fluent but meaningless speech (word salad), does not understand language
• Dominant parietal lobe (usually left): Language, calculation, right-left discrimination
  • Gerstmann's syndrome: Damage to dominant angular gyrus → Acalculia + Agraphia + Finger agnosia + Right-left disorientation
• Non-dominant parietal lobe (usually right): Spatial awareness, attention to left side
  • Damage → Hemispatial neglect / hemi-inattention: Ignores left side of environment and body
  • Constructional apraxia: Cannot draw or assemble objects spatially

Temporal Lobe

• Primary Auditory Cortex (Heschl's gyrus - Areas 41, 42): Hearing
• Wernicke's area extends into posterior superior temporal gyrus
• Hippocampus (medial temporal lobe): New memory formation (declarative/explicit memory)
  • Damage → anterograde amnesia (cannot form new memories)
• Amygdala: Fear, emotional memory, threat detection

Occipital Lobe

• Primary Visual Cortex (Area 17 - calcarine sulcus): Receives visual input
• Visual association areas (18, 19): Color, shape, motion recognition
• Damage → cortical blindness (if bilateral)
• Homonymous hemianopia: Damage to optic radiation or visual cortex → loss of same visual field in both eyes

---

Homunculus (Motor and Sensory)

• Motor homunculus (precentral gyrus): Body parts mapped on cortex with disproportionate representation
• Largest representations: Hand, face, lips (fine motor control needed)
• Smallest representations: Trunk, proximal limb
• Somatotopic arrangement (medial to lateral): Leg → Trunk → Arm → Hand → Face → Mouth
• Sensory homunculus (postcentral gyrus): Same arrangement

---

Internal Capsule

• White matter tract containing motor and sensory fibers
• Compressed funnel between thalamus and basal ganglia
• Anterior limb: Frontopontine fibers, thalamocortical (prefrontal) fibers
• Genu: Corticobulbar fibers (to cranial nerve motor nuclei)
• Posterior limb: Corticospinal tract (motor to body) + Thalamocortical sensory fibers (posterior part)
• Lesion here: Contralateral pure motor hemiplegia + hemisensory loss (major devastating stroke)

---

Basal Ganglia

• Deep gray matter nuclei: Caudate nucleus + Putamen + Globus pallidus + Subthalamic nucleus + Substantia nigra
• Striatum = Caudate + Putamen
• Lentiform nucleus = Putamen + Globus pallidus
• Corpus striatum = Caudate + Putamen + Globus pallidus

Function

• Modulation of voluntary movement (smoothing, scaling, initiating)
• NOT directly connected to spinal cord
• Works through loops: Cortex → Striatum → Globus pallidus → Thalamus → Cortex

Direct Pathway (facilitates movement)

• Cortex → Striatum → inhibits GPi/SNr → less inhibition of thalamus → thalamus activates cortex → movement facilitated
• Dopamine from substantia nigra (D1 receptors) facilitates direct pathway

Indirect Pathway (inhibits movement)

• Cortex → Striatum → inhibits GPe → less inhibition of STN → STN activates GPi → more inhibition of thalamus → movement suppressed
• Dopamine (D2 receptors) inhibits indirect pathway

Parkinson's Disease Mechanism

• Loss of dopaminergic neurons in substantia nigra pars compacta
• Without dopamine: direct pathway underactive, indirect pathway overactive
• Result: Thalamus over-inhibited → movement suppressed → bradykinesia, rigidity, tremor

Disorders of Basal Ganglia

---

Cerebellum

Structure

• Vermis (midline): Controls axial (trunk) coordination, posture, gait
• Hemispheres (lateral): Control ipsilateral limb coordination
• Flocculonodular lobe: Vestibular function, balance, eye movements

Cerebellar Peduncles

• Superior cerebellar peduncle (SCP): Efferent - output to thalamus and motor cortex
• Middle cerebellar peduncle (MCP): Afferent - input from pons (corticopontocerebellar tract)
• Inferior cerebellar peduncle (ICP): Afferent - input from spinal cord (spinocerebellar) and vestibular nuclei

Cerebellar Circuits

• Receives input: spinocerebellar tracts (proprioception), visual, vestibular, corticopontocerebellar (motor intention)
• Compares intended movement with actual movement → sends error correction signals
• Output: through SCP → thalamus → motor cortex (ipsilateral pathway - but controls contralateral body indirectly through cross of corticospinal tract)
• IPSILATERAL signs: Cerebellar lesion causes problems on the SAME side (cerebellum controls ipsilateral limbs)

Cerebellar Signs (DANISH Mnemonic)

• D = Dysdiadochokinesia (inability to perform rapid alternating movements)
• A = Ataxia (uncoordinated movement / gait ataxia)
• N = Nystagmus (involuntary eye oscillation - horizontal, toward lesion side)
• I = Intention tremor (tremor that INCREASES on approaching target - finger-nose test)
• S = Slurred speech (Dysarthria - scanning/explosive speech)
• H = Hypotonia (reduced muscle tone) + Hyporeflexia (pendular reflexes)

Additional Cerebellar Signs

• Past-pointing (dysmetria): Overshooting or undershooting targets
• Rebound phenomenon: Loss of check reflex - arm shoots past when resistance suddenly removed
• Truncal ataxia: Wide-based unstable stance (vermis lesion)
• Romberg test: NEGATIVE in cerebellar ataxia (unsteady with BOTH eyes open and closed)
• Heel-shin test: Cerebellar coordination test (slide heel down shin - ataxic = irregular)

---

Thalamus

• Major relay station for ALL sensory information (except smell) going to cortex
• VPL (Ventroposterolateral) nucleus: Relays proprioception + touch + pain/temperature from body
• VPM (Ventroposteromedial) nucleus: Relays sensation from face (trigeminal)
• VL (Ventrolateral) nucleus: Relays cerebellar output to motor cortex
• Pulvinar: Visual association
• Lateral geniculate nucleus (LGN): Vision relay
• Medial geniculate nucleus (MGN): Hearing relay
• Thalamic pain syndrome (Dejerine-Roussy): After thalamic stroke - severe contralateral pain (burning, hyperpathia)

---

Hypothalamus

• Controls: Hunger, thirst, temperature regulation, sleep-wake cycles, endocrine (via pituitary), autonomic
• Anterior hypothalamus: Cooling (parasympathetic), sleep
• Posterior hypothalamus: Heating (sympathetic), waking
• Lateral hypothalamus: Hunger (feeding center) - destroy = anorexia
• Ventromedial hypothalamus: Satiety center - destroy = obesity

---

Brainstem

Midbrain (Mesencephalon)

• Contains: Cerebral peduncles (corticospinal fibers), Red nucleus, Substantia nigra, Cranial nerve nuclei III (oculomotor) and IV (trochlear)
• Cerebral aqueduct passes through midbrain
• Superior colliculus: Visual reflexes
• Inferior colliculus: Auditory reflexes

Pons

• Contains: Cranial nerve nuclei V (trigeminal), VI (abducens), VII (facial), VIII (vestibulocochlear)
• Pneumotaxic and apneustic centers: Control breathing rhythm
• Basis pontis: Corticospinal tract + corticopontocerebellar fibers

Medulla Oblongata

• Contains: Cranial nerve nuclei IX (glossopharyngeal), X (vagus), XI (accessory), XII (hypoglossal)
• Pyramidal decussation: Corticospinal tracts CROSS here (~80% of fibers) → explains contralateral weakness
• Vital centers: Cardiac center, vasomotor center, respiratory center
• Lateral medullary syndrome (Wallenberg syndrome): Posterior inferior cerebellar artery (PICA) occlusion
  • Ipsilateral face pain/temperature loss (CN V nucleus) + contralateral body pain/temperature loss (spinothalamic tract)
  • Ipsilateral Horner's syndrome, dysphagia, dysarthria, ataxia

---

TOPIC 3: SPINAL CORD ANATOMY AND TRACTS

Spinal Cord Structure

Cross-Sectional Anatomy

• Gray matter: H-shaped central core (cell bodies)
  • Anterior (ventral) horn: Lower motor neuron cell bodies (alpha, gamma motor neurons)
  • Posterior (dorsal) horn: Sensory relay neurons (pain, temperature entry)
  • Lateral horn: Autonomic (sympathetic) neurons (T1-L2 only)
• White matter: Surrounding tracts (axons)
  • Posterior funiculus: Dorsal columns (proprioception, vibration, fine touch)
  • Lateral funiculus: Corticospinal tract (motor) + spinothalamic tract (pain/temp)
  • Anterior funiculus: Anterior corticospinal tract

---

Major Ascending (Sensory) Tracts

Dorsal Column - Medial Lemniscal System (DCML)

• Modalities: Proprioception, vibration, two-point discrimination, fine touch (discriminative touch)
• First-order neuron: Enters dorsal horn → travels IPSILATERALLY up dorsal column
  • Below T6: Fasciculus gracilis (legs and lower trunk - medial)
  • Above T6: Fasciculus cuneatus (arms and upper trunk - lateral)
• Second-order neuron: Synapses in nucleus gracilis/cuneatus (medulla) → crosses (decussates) in medulla as internal arcuate fibers → ascends as medial lemniscus
• Third-order neuron: Thalamus (VPL) → primary somatosensory cortex
• Lesion: IPSILATERAL loss of proprioception, vibration, fine touch below the lesion

Anterolateral System (Spinothalamic Tract)

• Modalities: Pain, temperature (lateral spinothalamic), crude touch and pressure (anterior spinothalamic)
• First-order neuron: Enters dorsal horn, synapses in substantia gelatinosa (Rexed laminae I, V)
• Second-order neuron: Crosses within 2-3 spinal segments via anterior commissure → ascends in contralateral anterolateral funiculus
• Third-order neuron: Thalamus (VPL) → somatosensory cortex
• Lesion: CONTRALATERAL loss of pain and temperature 2-3 levels below the lesion

Spinocerebellar Tracts (Proprioception to Cerebellum)

• Posterior spinocerebellar tract (PSCT):
  • Carries unconscious proprioception from LOWER limb
  • Uncrossed (ipsilateral) → enters cerebellum via ICP
• Anterior spinocerebellar tract (ASCT):
  • Carries unconscious proprioception from LOWER limb
  • Crosses twice (back to original side) → enters via SCP
• Cuneocerebellar tract: Carries proprioception from UPPER limb → ICP (like PSCT for arms)

---

Major Descending (Motor) Tracts

Corticospinal Tract (Pyramidal Tract)

• Most important voluntary motor pathway
• Origin: Primary motor cortex (60% from precentral gyrus, 40% from premotor + sensory cortex)
• Course: Motor cortex → internal capsule (posterior limb) → cerebral peduncles → pons → medulla pyramids
• Decussation: 80-90% cross at pyramidal decussation (medulla) → lateral corticospinal tract (controls contralateral limb muscles)
• 10-20% remain uncrossed → anterior corticospinal tract (bilateral trunk muscles, crosses at segmental level)
• Synapse: Directly on alpha motor neurons (or via interneurons) in anterior horn

Corticobulbar Tract

• Controls cranial nerve motor nuclei (facial, hypoglossal, etc.)
• Mostly bilateral innervation of cranial nerve nuclei EXCEPT lower face (contralateral only)
• Upper motor neuron (UMN) lesion: Contralateral LOWER face weakness (forehead spared = bilateral innervation)

---

Upper Motor Neuron (UMN) vs. Lower Motor Neuron (LMN) Lesions

Upper Motor Neuron (UMN) Lesion

• Location: Motor cortex, internal capsule, brainstem, spinal cord (above anterior horn)
• Features:
  • Spasticity (velocity-dependent increased tone - clasp-knife quality)
  • Hyperreflexia (exaggerated DTRs)
  • Positive Babinski sign (extensor plantar response - big toe extends + toes fan out)
  • Clonus (rhythmic oscillation on sustained stretch)
  • Weakness (paresis/plegia) - not complete paralysis usually
  • No muscle wasting (acute) - atrophy only later from disuse
  • No fasciculations
  • Clasp-knife rigidity (resistance then sudden release)

Lower Motor Neuron (LMN) Lesion

• Location: Anterior horn cells, ventral root, peripheral nerve, NMJ
• Features:
  • Flaccidity (reduced or absent tone)
  • Hyporeflexia / Areflexia (loss of DTRs)
  • Negative Babinski (absent plantar response)
  • Muscle wasting (atrophy) - early and severe
  • Fasciculations (spontaneous random muscle twitches - denervation)
  • Weakness (segmental or peripheral nerve distribution)
  • Fibrillations on EMG (denervation potentials)

UMN vs. LMN Comparison Table

---

Spinal Cord Syndromes

Complete Spinal Cord Injury (SCI)

• Total loss of motor and sensory function below the lesion
• All tracts affected

Brown-Séquard Syndrome (Spinal Cord Hemisection)

• Damage to ONE HALF of spinal cord
• Ipsilateral (same side as lesion):
  • UMN weakness (corticospinal tract - uncrossed at this level)
  • Loss of proprioception and vibration (dorsal column - uncrossed)
  • Segmental LMN weakness at the lesion level
• Contralateral (opposite side):
  • Loss of pain and temperature (spinothalamic - already crossed)
  • Loss starts 2-3 levels below the lesion
• Causes: Trauma (stab wound), tumor, demyelination (MS)

Central Cord Syndrome (Most Common Incomplete SCI)

• Damage to center of spinal cord
• Upper limbs weaker than lower limbs (cervical fibers are central in lateral CST; sacral fibers are peripheral)
• Bladder dysfunction (urinary retention)
• Variable sensory loss below lesion
• Mechanism: Hyperextension injury in elderly with cervical spondylosis (stenosis)
• Best prognosis of incomplete injuries

Anterior Cord Syndrome

• Damage to anterior 2/3 of spinal cord
• Tracts involved: Corticospinal (motor) + Spinothalamic (pain/temperature)
• Features: Motor paralysis + loss of pain and temperature below lesion
• Preserved: Dorsal columns (proprioception, vibration, fine touch = INTACT)
• Mechanism: Anterior spinal artery occlusion, flexion-burst fracture
• Worst prognosis of incomplete injuries

Posterior Cord Syndrome (Rare)

• Damage to dorsal columns only
• Loss: Proprioception, vibration, fine touch
• Preserved: Motor function + pain/temperature
• Causes: Syphilis (tabes dorsalis), B12 deficiency, multiple sclerosis

Conus Medullaris Syndrome

• Injury to conus (S2-S5 segments, around L1-L2 vertebral level)
• Mixed UMN + LMN features (sacral segments)
• Bladder: areflexic (LMN) - overflow incontinence
• Bowel: flaccid (LMN) - incontinence
• Sexual dysfunction
• Saddle anesthesia (S2-S5 sensory loss)
• Relatively preserved lower limb function (lesion is below limb motor neurons)

Cauda Equina Syndrome

• NOT a spinal cord injury (cord ends at L1-L2)
• Compression of lumbar and sacral nerve roots below the conus
• Pure LMN lesion (nerve roots):
  • Flaccid weakness of lower limbs
  • Areflexia
  • Saddle anesthesia
  • Bladder: areflexic (retention then overflow)
  • Bowel: flaccid incontinence
• Causes: Large central disc herniation at L4-L5 or L5-S1, tumor
• Surgical emergency: Decompress within 24-48 hours

---

TOPIC 4: STROKE (CEREBROVASCULAR ACCIDENT)

Definition

• Sudden onset focal neurological deficit due to cerebrovascular cause (ischemia or hemorrhage)
• Duration > 24 hours (< 24 hours = TIA - Transient Ischemic Attack)

Types

Ischemic Stroke (80%)

• Thrombotic: Atherosclerosis in large vessel (carotid, MCA) - common in sleep/early morning
• Embolic: Clot from elsewhere (heart AF, carotid plaque) - sudden maximum deficit
• Lacunar: Small vessel occlusion in deep structures (internal capsule, thalamus, basal ganglia, pons)

Hemorrhagic Stroke (20%)

• Intracerebral hemorrhage (ICH): Hypertensive bleed into brain tissue; most common sites = basal ganglia (putamen), thalamus, pons, cerebellum
• Subarachnoid hemorrhage (SAH): Berry aneurysm rupture; "thunderclap" (worst headache of life)

---

Arterial Territories and Deficits

Middle Cerebral Artery (MCA) - Most Common Stroke

• Territory: Lateral cerebral hemisphere (motor cortex for face and arm, sensory cortex for face and arm, Broca's, Wernicke's areas in dominant hemisphere, parietal lobe)
• Features:
  • Contralateral hemiplegia (face + arm > leg - because leg motor cortex is in medial strip supplied by ACA)
  • Contralateral hemisensory loss (face + arm > leg)
  • Hemianopia (contralateral visual field loss)
  • Aphasia (if dominant = left hemisphere): Broca's or Wernicke's depending on location
  • Neglect/Inattention (if non-dominant = right hemisphere)

Anterior Cerebral Artery (ACA)

• Territory: Medial frontal and parietal lobes (leg motor and sensory area, prefrontal cortex)
• Features:
  • Contralateral leg weakness and sensory loss (arm and face SPARED)
  • Behavioral changes (frontal lobe - apathy, disinhibition)
  • Urinary incontinence (parasagittal motor area)

Posterior Cerebral Artery (PCA)

• Territory: Occipital lobe (visual cortex), thalamus, midbrain
• Features:
  • Contralateral homonymous hemianopia with macular sparing (most characteristic)
  • Thalamic pain syndrome (if thalamus involved)
  • Memory loss (if hippocampus involved)
  • CN III palsy (midbrain involvement)

Vertebrobasilar (Posterior Circulation)

• Supplies: Brainstem, cerebellum, occipital lobes
• Basilar artery thrombosis: Locked-in syndrome (quadriplegia + mutism + eye opening only movement preserved)
• PICA (Posterior Inferior Cerebellar Artery): Wallenberg syndrome (lateral medullary syndrome)

---

Stroke Clinical Assessment

NIHSS (NIH Stroke Scale)

• Standardized 11-item scale assessing stroke severity
• Scores: 0 = no stroke; 1-4 = minor; 5-15 = moderate; 15-20 = moderate-severe; > 20 = severe
• Assesses: Level of consciousness, gaze, visual fields, facial palsy, arm/leg motor, limb ataxia, sensory, language, dysarthria, extinction/inattention

FAST Criteria (Public awareness)

• Face drooping
• Arm weakness
• Speech difficulty
• Time to call emergency

---

Stroke Physiotherapy Rehabilitation

Principles

• Early mobilization (within 24-48 hours if medically stable) - prevents complications (DVT, pneumonia, contractures)
• Task-specific training: Practice of real functional tasks (not just exercises)
• Neuroplasticity principles: Brain can reorganize with intensive practice

Motor Recovery Theories

• Brunnstrom's Stages of Motor Recovery (Most Tested):
  1. Flaccidity - No voluntary movement, no reflexes (immediately post-stroke)
  2. Spasticity developing - Synergy patterns begin to appear, basic limb synergies, minimal voluntary movement
  3. Synergies established - Spasticity peaks, voluntary movement only through synergy patterns
  4. Synergy broken - Some movements outside synergy possible, spasticity decreasing
  5. More independence from synergy - Complex movements emerging, spasticity continues decreasing
  6. Isolated movements - Near normal, spasticity minimal
  7. Normal (sometimes listed separately) - Full return

Synergy Patterns in Stroke

• Scapular retraction + elevation
• Shoulder abduction + ER
• Elbow flexion
• Forearm supination
• Wrist + finger flexion

• Scapular protraction + depression
• Shoulder adduction + IR
• Elbow extension
• Forearm pronation
• Wrist + finger extension

• Hip extension + adduction + IR
• Knee extension
• Ankle plantarflexion + inversion

• Hip flexion + abduction + ER
• Knee flexion
• Ankle dorsiflexion + eversion

---

Bobath Concept (NDT - Neurodevelopmental Treatment)

• Developed by Berta and Karel Bobath
• Principles:
  • Inhibit abnormal tone and movement patterns
  • Facilitate normal movement patterns
  • Key points of control: Proximal key points (shoulder girdle, pelvis) used to influence distal tone
  • Handling techniques: therapist guides movement quality
  • Promotes normal movement experience
• Reflex Inhibiting Patterns (RIPs): Positions/movements opposite to spasticity patterns
• Widely used in stroke, CP rehabilitation

---

Motor Relearning Programme (MRP) - Carr and Shepherd

• Based on motor learning principles
• 4 steps:
  1. Analysis of task
  2. Practice of missing components
  3. Practice of task
  4. Transfer of training

---

Constraint-Induced Movement Therapy (CIMT)

• Constrains the unaffected limb (mitt/sling) for most of the day
• Forces use of affected upper limb
• Intensive repetitive task practice (6+ hours/day for 2 weeks)
• Evidence-based for upper limb function improvement (Level A evidence)
• Requires: some wrist and finger extension in affected hand (inclusion criteria)

---

Common Post-Stroke Problems and Management

Spasticity

• Velocity-dependent increase in tonic stretch reflex
• Management: Positioning, passive ROM, stretching, splinting, botulinum toxin (BTX), oral baclofen, physical modalities (TENS, cold), functional electrical stimulation

Shoulder Subluxation

• Inferior displacement of humeral head due to weak rotator cuff and deltoid
• Risk: shoulder-hand syndrome, pain
• Prevention: Arm trough, lap tray, sling (Bobath roll), proper positioning
• Treatment: Strapping (McConnell shoulder taping), FES to supraspinatus + posterior deltoid, strengthening when possible

Shoulder-Hand Syndrome (Complex Regional Pain Syndrome Type I - CRPS I)

• After stroke: shoulder pain + hand edema + skin changes (shiny, warm or cold hand)
• Stages:
  1. Acute: Pain, edema, warmth
  2. Dystrophic: Skin changes, osteoporosis on X-ray
  3. Atrophic: Irreversible changes
• Treatment: elevation, active ROM, TENS, mirror therapy, stellate ganglion block

Dysphagia

• Swallowing difficulty common in acute stroke
• Risk: aspiration pneumonia (major cause of death post-stroke)
• Assessment: bedside swallow evaluation, FEES, videofluoroscopy
• Management: positioning (upright 90°, chin tuck), texture modification, swallowing exercises (Mendelsohn maneuver, Masako maneuver, Shaker exercise)

Pusher Syndrome (Ipsilateral Pushing)

• Patient actively pushes toward hemiplegic side and resists correction toward non-affected side
• Due to misperception of body orientation (thalamic involvement)
• Management: visual feedback, mirror, proper seating, functional tasks in upright

---

TOPIC 5: PARKINSON'S DISEASE (PD)

Pathophysiology

• Loss of dopaminergic neurons in substantia nigra pars compacta
• Lewy bodies (alpha-synuclein aggregates) - pathological hallmark
• Loss of dopamine → imbalance: direct pathway underactivated, indirect pathway overactivated → thalamus over-inhibited → reduced cortical activation → movement suppression

Clinical Features - Cardinal Signs (TRAP)

• T = Tremor at rest (pill-rolling: 4-6 Hz, thumb + index finger)
• R = Rigidity (lead pipe = constant throughout range; cogwheel = lead pipe + tremor = ratchety)
• A = Akinesia / Bradykinesia (slowness and poverty of movement)
• P = Postural instability (later feature - loss of righting reflexes)

Other Features

• Gait: Shuffling, reduced step length, festination (acceleration), start hesitation/freezing
• Stooped posture (flexed trunk, flexed neck, reduced arm swing)
• Micrographia (small handwriting)
• Hypophonia (soft voice)
• Masked facies (hypomimia - reduced facial expression - "poker face")
• Glabellar tap (Myerson's sign): Tapping glabella repeatedly - normal = habituates; PD = keeps blinking
• Seborrhea (oily skin), sialorrhea (drooling), constipation
• Cognitive decline / Dementia (in advanced PD)
• Depression (very common - 40-50%)
• REM Sleep Behaviour Disorder (acts out dreams)

Hoehn and Yahr Scale (Staging PD)

Physiotherapy for PD

Key Principles

• Large Amplitude Movement Training (LSVT BIG)
• Loud Voice Training (LSVT LOUD - for dysarthria/hypophonia)
• Cueing strategies (external cues overcome basal ganglia deficits in internal rhythm generation)

Cueing Types (Very Commonly Tested)

• Auditory cues: Metronome, music beat → rhythmic stepping
• Visual cues: Lines on floor (transverse lines), laser shoe pointer → overcome freezing
• Proprioceptive cues: Rhythmic manual input from therapist
• Cues bypass the defective basal ganglia → activate cerebellar/premotor (supplementary motor area) pathways

Exercise for PD

• Treadmill training: Improves walking speed, stride length
• Nordic walking (poles): Improves posture, balance, arm swing
• Tai Chi: Balance, falls prevention
• Dance / Tango: Rhythm, balance
• Boxing (non-contact): Power, coordination (Rock Steady Boxing)
• Resistance training: Addresses muscle weakness

UPDRS (Unified Parkinson's Disease Rating Scale)

• Most used outcome measure for PD severity
• 4 parts: Mentation, Activities of daily living, Motor examination, Complications

Dual Task Training

• PD patients have difficulty with dual tasks (walking while talking = increased falls risk)
• Practice dual tasks: cognitive + motor simultaneously
• Improves automaticity of walking

---

TOPIC 6: MULTIPLE SCLEROSIS (MS)

Definition

• Chronic autoimmune demyelinating disease of the CNS (brain + spinal cord)
• Most common demyelinating disease
• Affects young adults (20-40 years), females > males (2:1)

Pathology

• Immune-mediated destruction of myelin sheath in CNS
• Plaques (lesions): Areas of demyelination and gliosis in white matter
• Oligodendrocytes produce CNS myelin (damaged in MS)
• Schwann cells produce PNS myelin (NOT affected in MS)

Clinical Features

• Optic neuritis: Painful loss of vision in one eye; most common initial symptom; relative afferent pupillary defect (RAPD) = Marcus Gunn pupil
• Internuclear ophthalmoplegia (INO): MLF (medial longitudinal fasciculus) lesion → impaired adduction of one eye + nystagmus in other eye on lateral gaze; bilateral INO = highly specific for MS
• Lhermitte's sign: Electric shock sensation down spine on neck flexion (posterior column demyelination in cervical cord)
• Uhthoff's phenomenon: Worsening of symptoms with heat (exercise, hot bath, fever) - classic for MS
• Charcot's triad (of MS): Nystagmus + Intention tremor + Scanning speech (dysarthria)
• Spasticity (one of most disabling symptoms)
• Fatigue (most common symptom overall - affects >90%)
• Bladder dysfunction (urgency, frequency, hesitancy)
• Sensory symptoms (numbness, tingling, dysesthesia)
• Cognitive impairment (memory, attention, processing speed)

Types of MS

• Relapsing-Remitting MS (RRMS): Most common (85%); episodes of relapse with recovery between them
• Primary Progressive MS (PPMS): Gradual progression from onset without relapses
• Secondary Progressive MS (SPMS): Initially RRMS then becomes progressively worsening
• Progressive-Relapsing MS: Progressive from onset with occasional relapses

Diagnosis (McDonald Criteria)

• Dissemination in space: Lesions in ≥2 different CNS locations
• Dissemination in time: Lesions at ≥2 different time points
• MRI: Periventricular plaques, juxtacortical, infratentorial, spinal cord

Physiotherapy for MS

Fatigue Management (Priority)

• Energy conservation techniques: Pacing activities, rest breaks, planning
• Cooling strategies: Pre-cooling vest, cool environment (Uhthoff's - heat worsens MS)
• MFIS (Modified Fatigue Impact Scale) - outcome measure
• Exercise: aerobic + resistance (improves fatigue, does NOT exacerbate MS)

Spasticity Management

• Stretching (daily passive stretching, splinting)
• Cold therapy (temporary spasticity reduction)
• FES, TENS
• Pharmacological: Baclofen (oral or intrathecal pump), tizanidine, botulinum toxin

Balance and Falls Prevention

• Progressive balance training
• Ankle foot orthoses (AFO) for foot drop
• FES drop foot stimulator
• Walking aids (rollator preferred over standard frame)

Outcome Measures for MS

• EDSS (Expanded Disability Status Scale): 0-10 scale (0=normal, 10=death from MS)
• MSWS-12 (MS Walking Scale)
• MFIS (Modified Fatigue Impact Scale)
• Symbol Digit Modalities Test: Cognitive processing speed

---

TOPIC 7: CEREBRAL PALSY (CP)

Definition

• Group of permanent, non-progressive motor disorders caused by damage to the developing brain
• Brain damage occurs: antenatally (most common), perinatally, or in first 2 years of life
• Motor impairment is constant but the pattern may change as child develops

Classification by Motor Type

Spastic CP (Most Common - ~80%)

• Upper motor neuron lesion → spasticity, hyperreflexia, positive Babinski
• Diplegia: Bilateral, legs > arms (most common spastic type; associated with prematurity/PVL)
• Hemiplegia: One side (upper and lower limb on same side); arm > leg usually
• Quadriplegia: All four limbs (most severe; often associated with intellectual disability, seizures)

Dyskinetic CP (~15%)

• Basal ganglia damage (usually from kernicterus/hypoxic-ischemic encephalopathy)
• Athetosis: Slow, writhing, involuntary movements
• Chorea: Quick, jerky, irregular involuntary movements
• Dystonia: Sustained abnormal postures

Ataxic CP (~5%)

• Cerebellar involvement → hypotonia, incoordination, intention tremor, ataxic gait
• Wide-based gait

Mixed CP

• Combination of types (most common = spastic + dyskinetic)

Associated Conditions in CP

• Intellectual disability (50%)
• Epilepsy (35-45%)
• Communication problems / Speech disorders
• Visual problems (strabismus, refractive errors)
• Hearing impairment
• Feeding difficulties / dysphagia
• Orthopedic problems: Hip dislocation, scoliosis, contractures

Primitive Reflexes in CP

GMFCS (Gross Motor Function Classification System)

• 5-level classification system for CP (I-V)
• Level I: Walks without limitations
• Level II: Walks with limitations
• Level III: Walks using a hand-held mobility device
• Level IV: Self-mobility with limitations; uses powered mobility
• Level V: Transported in manual wheelchair (no self-locomotion)

Physiotherapy for CP

Goals

• Prevent/minimize secondary deformities (contractures, scoliosis)
• Improve functional mobility and independence
• Optimize participation in activities

Approaches

• Bobath (NDT): Inhibit abnormal tone, facilitate normal movement
• Vojta Therapy: Reflex locomotion - stimulation of specific zones → global motor patterns
• Conductive Education (Peto): Group learning environment, rhythmic intention
• CIMT: For hemiplegic CP with affected upper limb
• Hippotherapy: Therapeutic horse riding - trunk stability, balance
• Hydrotherapy: Buoyancy supports weak limbs, warm water reduces tone

Orthoses for CP

• AFO (Ankle Foot Orthosis): Controls equinus foot, assists walking
• DAFO (Dynamic AFO): Flexible, allows some ankle movement
• Hand splints: Prevent wrist/finger flexion contractures
• Hip abduction orthosis: Prevents hip dislocation

---

TOPIC 8: SPINAL CORD INJURY (SCI)

Classification - ASIA Impairment Scale (AIS)

Key Concepts

Neurological Level of Injury (NLI)

• Most caudal segment with normal motor AND sensory function bilaterally
• Determines functional level and expected outcomes

Zone of Partial Preservation

• In complete injuries: segments below NLI with partial motor or sensory function

---

Functional Expectations by Level

Key Functional Muscles by Level

• C4: Diaphragm (breathing)
• C5: Deltoid, biceps (shoulder abduction, elbow flexion)
• C6: ECRL (wrist extension) - enables tenodesis grip
• C7: Triceps (elbow extension) - enables transfers
• C8: FDS/FDP (finger flexion)
• T1: Hand intrinsics

Tenodesis Grasp

• Passive grasp using wrist extension
• When wrist extends → finger flexors become taut → fingers and thumb close passively (grasp)
• When wrist flexes → fingers open (release)
• Functional in C6 level SCI without hand intrinsics
• Important: Do NOT stretch finger flexors in C6 SCI (must preserve tightness for tenodesis)

---

Complications of SCI

Autonomic Dysreflexia (AD) - Medical Emergency

• Only in injuries at T6 and above
• Massive sympathetic response to a noxious stimulus below the level of injury
• Trigger: Bladder distension (most common), bowel impaction, pressure sore, tight clothing, urinary tract infection
• Symptoms: Pounding headache, profuse sweating above level, flushing above level, pallor below level, bradycardia (paradoxical), hypertension (up to 300 mmHg systolic)
• Treatment (IMMEDIATE):
  1. Sit patient UPRIGHT (orthostatic drop in BP)
  2. Loosen all tight clothing
  3. Check and empty bladder (catheterize)
  4. Check bowel (remove impaction with anesthetic gel)
  5. Check for other stimuli
  6. Anti-hypertensive if BP remains high (nifedipine, nitrates)
  7. Do NOT leave patient alone

Spinal Shock

• After acute SCI: temporary loss of ALL spinal cord function below injury (including reflexes)
• Duration: Days to weeks
• Resolution marker: Return of bulbocavernosus reflex (BCR) = first reflex to return
• After spinal shock resolves: true prognosis of neurological recovery becomes apparent

Neurogenic Bladder

• UMN bladder (injury above conus, T1-L1): Spastic/reflex bladder; involuntary detrusor contractions; small capacity; frequency + urgency; managed with intermittent catheterization + anticholinergics
• LMN bladder (injury at conus or cauda equina): Flaccid/areflexic bladder; large capacity; retention + overflow; managed with intermittent catheterization + Credé maneuver

Orthostatic Hypotension

• Fall in BP >20 mmHg systolic on changing from lying to sitting/standing
• Common in cervical + thoracic SCI (loss of sympathetic tone)
• Management: Abdominal binder, compression stockings, gradual tilt table progression, fludrocortisone (mineralocorticoid)

Heterotopic Ossification (HO)

• Abnormal bone formation in soft tissues (around hip most common)
• Occurs 1-4 months post-SCI
• Signs: swelling, warmth, restricted ROM at hip (mimics DVT)
• Diagnosis: Raised alkaline phosphatase (ALP), bone scan, X-ray
• Management: Etidronate (bisphosphonate), ROM exercises, avoid aggressive passive ROM (may worsen)

Pressure Ulcers

• Risk areas: Sacrum (supine), Greater trochanter (side-lying), Ischial tuberosity (sitting), Heel
• Prevention: Regular repositioning, pressure-relieving cushion, skin inspection, adequate nutrition
• Staging: Stage 1 (redness) → 2 (partial thickness) → 3 (full thickness) → 4 (bone/muscle involvement) → Unstageable

---

TOPIC 9: TRAUMATIC BRAIN INJURY (TBI)

Classification by Severity (GCS)

• GCS (Glasgow Coma Scale): Eyes (1-4) + Verbal (1-5) + Motor (1-6) = Total 3-15
  • Mild TBI: GCS 13-15 (concussion)
  • Moderate TBI: GCS 9-12
  • Severe TBI: GCS ≤ 8

GCS Components

Eye Opening (E)

• 4: Spontaneous
• 3: To voice
• 2: To pain
• 1: None

Verbal Response (V)

• 5: Oriented
• 4: Confused
• 3: Inappropriate words
• 2: Sounds only
• 1: None

Motor Response (M)

• 6: Obeys commands
• 5: Localizes pain
• 4: Withdraws from pain
• 3: Abnormal flexion (Decorticate)
• 2: Extension (Decerebrate)
• 1: None

Decorticate vs. Decerebrate Posturing

• Decorticate (GCS motor 3): Flexion of arms, extension of legs (lesion above red nucleus - above midbrain)
• Decerebrate (GCS motor 2): Extension and IR of arms + extension of legs (lesion at midbrain/upper pons level - worse prognosis)

Rancho Los Amigos Cognitive Scale (Levels of Cognitive Functioning)

Post-Traumatic Amnesia (PTA)

• Period of confusion and memory loss following TBI
• Duration correlates with severity of TBI:
  • < 24 hours: Mild TBI
  • 1-7 days: Moderate TBI

  • 7 days: Severe TBI

  • 4 weeks: Very severe TBI

• Measured with WPTAS (Westmead PTA Scale)

Physiotherapy in TBI

• During coma: Positioning, passive ROM, sensory stimulation, respiratory management
• Emerging from coma: Sensory stimulation, Rancho IV = calm environment (agitation)
• Cognitive rehabilitation: Memory strategies, attention training, executive function
• Motor rehabilitation: Same as stroke (balance, gait, UL function)
• Falls prevention: High priority due to impulsivity + poor balance

---

TOPIC 10: PERIPHERAL NERVE INJURIES

Sunderland Classification (5 Degrees)

Key Points

• Neuropraxia (1st degree): Local conduction block; no Wallerian degeneration; fastest recovery
• Axonotmesis (2nd degree): Wallerian degeneration distal to injury; axon regenerates at 1 mm/day (Tinel's sign advances distally as nerve regenerates)
• Neurotmesis (4th/5th degree): Surgical repair needed (primary neurorrhaphy or nerve graft)

Wallerian Degeneration

• Degeneration of axon and myelin DISTAL to the site of injury
• Begins within 24-48 hours of injury
• Macrophages clear debris
• Schwann cells form bands of Büngner (guide regenerating axon)
• Proximal stump then begins to regenerate (sprouts grow at 1 mm/day)

---

Common Nerve Injuries (Already covered in orthopedic notes - key points repeated)

Radial Nerve

• Saturday night palsy (axilla/spiral groove compression)
• Wrist drop + loss of finger/thumb extension
• Sensation: dorsum of hand (anatomical snuffbox area)

Median Nerve

• CTS (low lesion): thenar wasting, sensory loss thumb/index/middle
• High lesion: Benediction hand / Pope's blessing sign
• Ape hand: thenar wasting + loss of thumb opposition/abduction

Ulnar Nerve

• Claw hand (ring + little fingers)
• Froment's sign (positive = uses FPL for pinch)
• Intrinsic minus hand

Common Peroneal

• Foot drop, steppage gait, sensory loss dorsum of foot

---

TOPIC 11: NEUROLOGICAL PHYSIOTHERAPY APPROACHES

Motor Learning Principles (Applied to Neuro Rehab)

Practice Types

• Massed practice: Continuous practice with minimal rest (increases fatigue but intensive)
• Distributed practice: Rest intervals between practice sessions (less fatigue, better learning)
• Blocked practice: Same task repeated (easier, builds confidence)
• Random practice: Tasks varied in random order (harder but better long-term retention - Contextual Interference Effect)
• Part practice: Practice component of task separately
• Whole practice: Practice entire task (better for simple tasks or when parts are highly interdependent)

Feedback Types

• Intrinsic (inherent) feedback: From patient's own sensory systems (proprioception, vision, vestibular)
• Extrinsic (augmented) feedback: External information given by therapist
  • Knowledge of Results (KR): Outcome of movement (did you reach the cup?)
  • Knowledge of Performance (KP): Quality of movement (how you moved)
• Bandwidth feedback: Feedback given only when error exceeds a certain threshold (better for learning)
• Fading feedback: Gradually reduce frequency of feedback as skill improves → promotes independence

Stages of Motor Learning (Fitts and Posner)

1. Cognitive stage: Much thinking needed; many errors; therapist guidance high
2. Associative stage: Less thinking; fewer errors; practice-dependent improvement
3. Autonomous stage: Automatic, little conscious thought; can dual-task

---

Neuroplasticity Principles

Definition

• Ability of the brain to reorganize itself by forming new neural connections
• Use-dependent plasticity: "neurons that fire together, wire together" (Hebb's rule)

Key Principles (Kleim and Jones, 10 Principles)

1. Use it or lose it: Neural circuits deteriorate without use
2. Use it and improve it: Training drives plasticity
3. Specificity: Nature of training determines nature of plasticity
4. Repetition matters: Sufficient repetition is required to induce plasticity
5. Intensity matters: Sufficient intensity required
6. Time matters: Different training appropriate at different times post-injury
7. Salience matters: Meaningful training is more effective
8. Age matters: Younger brains more plastic
9. Transference: Plasticity in one form can enhance others
10. Interference: Plasticity can interfere with other behaviors (learned non-use)

Learned Non-Use

• After stroke: affected limb used less because attempts are unsuccessful
• Non-use becomes learned behavior → cortical representation shrinks
• CIMT reverses learned non-use

---

Proprioceptive Neuromuscular Facilitation (PNF) in Neuro

• Already covered in exercise therapy - same principles apply
• In neuro: uses irradiation (strong → weak), timing for emphasis, developmental patterns

Brunnstrom Approach

• Uses synergy patterns as stepping stones toward normal movement
• Works WITH synergies in early stages (not fighting them)
• Stimulates reflexes and reactions to facilitate movement
• Progress through Brunnstrom's 7 stages

Rood's Approach

• Uses sensory stimulation to facilitate or inhibit motor response
• Facilitatory inputs: Fast brushing, vibration, icing, tapping
• Inhibitory inputs: Slow stroking, sustained pressure, warmth, slow rhythmic movement

---

TOPIC 12: NEUROLOGICAL ASSESSMENT TOOLS

Outcome Measures - Neuro

Functional Independence

• FIM (Functional Independence Measure): 18 items; 7-point scale (1=total assistance, 7=complete independence); measures burden of care; Total score 18-126
• Barthel Index: 10 ADL items; score 0-100; simple, widely used; cannot detect small changes
• WeeFIM: Pediatric version of FIM

Balance Measures

• Berg Balance Scale (BBS): 14 tasks; 0-4 each; total 0-56; < 45 = fall risk
• Timed Up and Go (TUG): Time to stand from chair, walk 3 m, turn, return; > 12 seconds = fall risk; > 30 seconds = dependent for mobility
• Dynamic Gait Index (DGI): 8 walking tasks
• Mini-BESTest: 14 items; assesses different balance systems

Stroke-Specific

• Fugl-Meyer Assessment (FMA): Motor recovery in stroke (UL + LL + balance + sensation); UL section = 66, LL = 34; total = 226
• Motor Assessment Scale (MAS): 8 motor items; 0-6 each
• Rivermead Motor Assessment (RMA)

Spasticity

• Modified Ashworth Scale (MAS): Most commonly used spasticity scale
  • 0: No increase in tone
  • 1: Slight increase; catch and release at end of range
  • 1+: Slight increase; catch + minimal resistance for < half ROM
  • 2: More marked increase; resistance through most of ROM; part still moved easily
  • 3: Considerable increase; passive movement difficult
  • 4: Affected parts rigid in flexion or extension
• Tardieu Scale: More specific for spasticity (tests at two velocities - slow V1 and fast V3)
  • R1 (at fast V3): angle of catch = spastic component
  • R2 (at slow V1): full ROM = contracture component
  • R2 - R1 = dynamic component (true spasticity range)

Parkinson's

• UPDRS: Unified Parkinson's Disease Rating Scale (covered above)
• Hoehn and Yahr: Staging (covered above)
• PDQ-39: Quality of life in PD (39 items, 8 domains)

SCI

• ASIA Scale: Neurological classification (covered above)
• SCIM (Spinal Cord Independence Measure): Functional independence in SCI; better than FIM for SCI; 19 items; 0-100

---

TOPIC 13: CRANIAL NERVES AND CLINICAL TESTING

12 Cranial Nerves Summary

Key CN Pairings for Reflexes

• Corneal reflex: Afferent = CN V (ophthalmic division V1); Efferent = CN VII (orbicularis oculi)
• Gag reflex: Afferent = CN IX; Efferent = CN X
• Pupillary light reflex: Afferent = CN II; Efferent = CN III (constriction)
• Jaw jerk: Afferent + Efferent = CN V (pons); hyperactive in bilateral UMN lesion above pons

UMN Facial Weakness (CN VII)

• Cortex lesion (stroke): Contralateral lower face weakness (forehead SPARED = bilateral cortical innervation)
• LMN lesion (Bell's palsy): All ipsilateral face (forehead NOT spared = entire face paralyzed)
• Clinical trick: If patient can wrinkle forehead on weak side = UMN lesion (not Bell's palsy)

---

TOPIC 14: COMMON NEUROLOGICAL CONDITIONS

Bell's Palsy

• Idiopathic LMN facial nerve (CN VII) palsy
• Entire ipsilateral face (all muscles including forehead)
• Sudden onset, unilateral
• Associated: Bell's phenomenon (eye rolls up when trying to close)
• Treatment: Corticosteroids (within 72 hours), eye care (artificial tears, eye patch at night - cannot close eye)
• Physiotherapy: Facial exercises, electrical stimulation (controversial), massage, taping for drooling

Guillain-Barré Syndrome (GBS)

• Acute inflammatory demyelinating polyneuropathy (AIDP)
• Post-infectious (Campylobacter jejuni most common trigger, also CMV, EBV, Zika virus)
• Ascending LMN weakness (starts in legs, ascends to arms, then may reach respiratory muscles)
• Lumbar puncture: Albuminocytologic dissociation (high protein, normal cells)
• Autonomic dysfunction: BP fluctuations, arrhythmias
• Respiratory failure: Main cause of death → monitor FVC (ventilate if FVC < 20 mL/kg or drops rapidly)
• Treatment: IVIG or plasmapheresis
• Physiotherapy:
  • Acute: Monitor breathing, prevent complications (positioning, passive ROM, DVT prevention)
  • Recovery: Progressive exercise as strength returns, fatigue management
  • Most patients: Significant recovery (85% ambulant at 6 months)

Motor Neuron Disease (MND) / ALS (Amyotrophic Lateral Sclerosis)

• Progressive degeneration of BOTH UMN and LMN simultaneously
• Combined UMN + LMN signs in same patient = hallmark
• Fasciculations with hyperreflexia = classic combination seen nowhere else
• UMN signs: Spasticity, hyperreflexia, Babinski
• LMN signs: Wasting, fasciculations, weakness
• Bulbar palsy: Weakness of speech, swallowing, breathing
• No sensory or cognitive involvement (usually)
• Fatal (respiratory failure typically within 3-5 years)
• Physiotherapy: Maintain function, prevent complications, fatigue management, respiratory support, AAC (augmentative and alternative communication)

Myasthenia Gravis (MG)

• Autoimmune disease: antibodies against acetylcholine receptors (AChR) at NMJ
• Leads to: Fatigable weakness (weakness increases with activity, improves with rest)
• Ptosis (most common - worsens during day), diplopia, proximal limb weakness
• Fatiguable: Ice pack test (cold reduces ptosis temporarily), Tensilon test (edrophonium - AChE inhibitor - briefly improves weakness)
• Treatment: Pyridostigmine (AChE inhibitor), immunosuppressants, thymectomy
• Myasthenic crisis: Respiratory failure from severe weakness (emergency)
• Physiotherapy: Energy conservation, graded exercise, respiratory management

---

QUICK-FIRE REVISION - NEUROLOGY

Tract Lesions

• Dorsal columns lesion = IPSILATERAL proprioception, vibration, fine touch loss
• Spinothalamic lesion = CONTRALATERAL pain, temperature loss (2-3 levels below)
• Corticospinal lesion = CONTRALATERAL weakness (crosses at medullary decussation)
• Cerebellar lesion = IPSILATERAL coordination problems

Spinal Cord Syndromes

• Brown-Séquard = ipsilateral motor + proprioception loss; contralateral pain + temperature loss
• Central cord = UL > LL weakness (most common incomplete SCI)
• Anterior cord = motor + pain/temp loss; proprioception PRESERVED (worst prognosis)
• Posterior cord = proprioception loss only (dorsal columns)
• Cauda equina = pure LMN (surgical emergency)

UMN vs. LMN Key Points

• UMN = Spasticity + hyperreflexia + Babinski+ + clonus
• LMN = Flaccidity + hyporeflexia + Babinski- + fasciculations + wasting

Brunnstrom Stages

• Stage 1 = Flaccidity
• Stage 2 = Synergy beginning
• Stage 3 = Synergy peak (spasticity max)
• Stage 4 = Breaking synergy
• Stage 5 = More independence from synergy
• Stage 6 = Isolated movements

Parkinson's TRAP

• Tremor (rest) + Rigidity (cogwheel/lead pipe) + Akinesia/Bradykinesia + Postural instability

Cerebellar = DANISH

• Dysdiadochokinesia + Ataxia + Nystagmus + Intention tremor + Slurred speech + Hypotonia

Stroke Arteries

• MCA = Face + arm weakness (arm > leg), aphasia (dominant), neglect (non-dominant)
• ACA = Leg weakness (leg > arm + face)
• PCA = Homonymous hemianopia with macular sparing

Autonomic Dysreflexia

• T6 and above, noxious stimulus below level
• Headache + sweating + hypertension + bradycardia
• First action = SIT UP and remove cause (bladder = most common)

Key Numbers

• GCS: Mild = 13-15; Moderate = 9-12; Severe = ≤8
• TUG: > 12 sec = fall risk; > 30 sec = dependent
• Berg Balance: < 45 = fall risk
• FIM: 18 (total assist) to 126 (complete independence)
• Modified Ashworth: 0-4 (spasticity)
• Axon regeneration rate = 1 mm/day
• Bulbocavernosus reflex returns = marks end of spinal shock
• Capillary closing pressure = 32 mmHg (pressure ulcer prevention)

Key Reflexes

• Babinski positive (extensor plantar) = UMN lesion
• Kernig + Brudzinski = meningitis
• Romberg positive = posterior column / vestibular (NOT cerebellar)
• Lhermitte = posterior column cervical cord (MS)
• ATNR persistence beyond 6 months = CP
• Bulbocavernosus reflex = first reflex after spinal shock

---