For 10marker explain sciatic nerve palsy pt asessmwnt and management
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Sciatic Nerve Palsy — Patient Assessment & Management (10-Mark Answer)
Anatomy Recap (Brief Context)
The sciatic nerve (L4, L5, S1, S2, S3) is the largest nerve in the body. It exits the pelvis via the greater sciatic foramen, passes below piriformis, descends the posterior thigh, and divides at the popliteal fossa into:
- Common peroneal (fibular) nerve → dorsiflexion, eversion, sensation dorsum of foot
- Tibial nerve → plantarflexion, inversion, sensation sole of foot
Causes / Aetiology
| Category | Examples |
|---|---|
| Trauma | Hip dislocation (posterior), acetabular fracture, penetrating injury |
| Iatrogenic | Misplaced gluteal injection (most common in children), total hip replacement |
| Compression | Piriformis syndrome, pelvic tumour, abscess, haematoma |
| Ischaemia | Prolonged lithotomy position, vascular injury |
| Neuropathy | Diabetic mononeuritis, herpes zoster |
Assessment
1. History
- Onset: acute (trauma/surgery) vs. gradual (tumour/diabetes)
- Mechanism: hip dislocation, injection site, prolonged positioning
- Symptoms:
- Weakness of foot and ankle movements
- Numbness/paraesthesia over posterior thigh, lateral leg, and entire foot
- Pain radiating down the leg (sciatica)
- Past history: diabetes, malignancy, prior hip surgery
- Bladder/bowel — if bilateral, consider cauda equina (differentiates central from peripheral)
2. Motor Examination
| Muscle Group | Nerve Division | Root | Finding in Palsy |
|---|---|---|---|
| Knee flexion (hamstrings) | Sciatic (proximal) | L5/S1 | Weak if high lesion |
| Dorsiflexion (tibialis anterior) | Common peroneal | L4/L5 | Foot drop |
| Eversion (peroneals) | Common peroneal | L5/S1 | Weak |
| Plantarflexion (gastrocnemius) | Tibial | S1/S2 | Weak |
| Inversion (tibialis posterior) | Tibial | L4/L5 | Weak |
| Toe extension (EHL) | Deep peroneal | L5 | Weak |
Key sign: Foot drop (inability to dorsiflex) = common peroneal division most commonly affected (more superficial and susceptible).
3. Sensory Examination
- Posterior thigh — posterior femoral cutaneous nerve (associated)
- Lateral leg — superficial peroneal nerve
- Dorsum of foot — deep peroneal nerve
- Sole of foot — tibial nerve
- Web space 1st–2nd toe — deep peroneal nerve (specific)
Map sensory loss to distinguish complete sciatic palsy vs. isolated common peroneal or tibial palsy.
4. Reflexes
| Reflex | Root | Finding |
|---|---|---|
| Knee jerk | L3/L4 | Usually preserved (femoral nerve) |
| Ankle jerk | S1/S2 | Absent or diminished |
| Plantar response | — | May be absent/equivocal |
5. Gait Assessment
- High-stepping (steppage) gait due to foot drop (clears toe by excessive hip/knee flexion)
- Circumduction to clear the foot
6. Provocative Tests
- Straight leg raise (SLR / Lasègue's sign): positive if nerve root irritation present (L4–S1)
- SLUMP test: stretch test for sciatic irritation
- FAIR test (Flexion, Adduction, Internal Rotation): used to diagnose piriformis syndrome
7. Investigations
| Investigation | Purpose |
|---|---|
| Nerve conduction studies (NCS) | Localise lesion; assess conduction velocity and amplitude |
| Electromyography (EMG) | Detect denervation, assess axonal vs. demyelinating injury |
| MRI pelvis/thigh | Tumour, abscess, haematoma, piriformis hypertrophy |
| X-ray / CT hip | Fracture, dislocation, hardware from THR |
| MRI lumbar spine | Exclude central (disc/canal) cause |
| Blood glucose / HbA1c | Exclude diabetic neuropathy |
NCS/EMG are performed 3–4 weeks post-injury (denervation potentials take time to develop).
Management
Principles: Based on Sunderland Classification
| Grade | Pathology | Prognosis |
|---|---|---|
| I (Neuropraxia) | Conduction block, axons intact | Full recovery weeks–months |
| II (Axonotmesis) | Axonal disruption, endoneurium intact | Good recovery (1 mm/day axon regrowth) |
| III–V (Neurotmesis) | Progressive structural disruption | Poor; may need surgery |
1. Immediate / Conservative Management
- Remove the cause: reduce hip dislocation urgently (within 6 hours), correct positioning, drain abscess/haematoma
- Foot drop splint (ankle-foot orthosis, AFO): maintains neutral ankle position, prevents equinus contracture, improves gait
- Analgesia: NSAIDs, neuropathic agents (pregabalin, gabapentin, amitriptyline) for neuropathic pain
- Physiotherapy:
- Passive range of motion exercises to prevent contractures
- Strengthening of remaining muscle groups
- Gait retraining
- Occupational therapy: functional adaptations
2. Surgical Management
Indications:
- Open injuries (transection) — primary repair within 72 hours if possible
- Haematoma / tumour compression — evacuation/excision
- No recovery at 3–4 months on EMG/NCS → surgical exploration
- Failed conservative management
Procedures:
| Procedure | Indication |
|---|---|
| Neurolysis | Scar/fibrosis compressing nerve |
| Direct neurorrhaphy | Clean lacerations, tension-free repair |
| Nerve grafting (sural nerve) | Gap >2–3 cm; cable grafts used |
| Tendon transfer | Tibialis posterior → dorsum (foot drop); for established palsy with no recovery |
| Arthrodesis (ankle/subtalar) | Flail foot in irreversible palsy |
3. Monitoring & Follow-Up
- Serial NCS/EMG at 3, 6, 12 months to track reinnervation
- Clinical motor scoring (MRC scale 0–5) at each visit
- Prognosis depends on:
- Level of injury (proximal worse than distal)
- Mechanism (crush worse than stretch)
- Severity (Sunderland grade)
- Age (younger patients recover better)
- Time to treatment
Summary Table for Exam
| Domain | Key Points |
|---|---|
| Aetiology | Posterior hip dislocation, THR, gluteal injection, piriformis syndrome |
| Motor deficit | Foot drop (common peroneal); plantarflexion weakness (tibial) |
| Sensory loss | Lateral leg + dorsum + sole of foot |
| Reflex lost | Ankle jerk (S1) |
| Key investigation | NCS/EMG (3–4 weeks post-injury) + MRI |
| Immediate Mx | Treat cause + AFO + physio + analgesia |
| Surgery | Primary repair, nerve graft, tendon transfer, arthrodesis |
| Monitoring | Serial NCS/EMG + MRC grading |
Exam tip: For a 10-marker, structure your answer with Assessment (history → examination → investigations) and Management (conservative → surgical → rehabilitation → follow-up). Mentioning the Sunderland classification and AFO for foot drop scores high marks.
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Sciatic Nerve Palsy — Physiotherapy Assessment & Management (10-Mark Answer)
PART A: PHYSIOTHERAPY ASSESSMENT
1. Subjective Assessment (History)
- Chief complaint: foot drop, weakness, pain, numbness in lower limb
- History of present illness: onset, mechanism (hip dislocation, surgery, injection, prolonged pressure), duration
- Pain assessment: site, radiation, character (burning, shooting = neuropathic), severity (VAS / NRS 0–10)
- Functional limitations: difficulty walking, climbing stairs, standing, ADLs
- Aggravating / relieving factors
- Past medical history: diabetes, prior surgeries, malignancy
- Social history: occupation, home environment (stairs?), activity level
- Patient goals: return to work, walking independence
2. Observation
| Finding | Significance |
|---|---|
| Foot drop at rest | Common peroneal division affected |
| Muscle wasting (calf, anterior compartment) | Chronic denervation |
| Steppage / circumduction gait | Compensation for foot drop |
| Skin changes (shiny, dry, trophic) | Autonomic involvement |
| Postural asymmetry | Altered weight bearing |
| Footwear wear pattern | Toe drag = foot drop |
3. Gait Assessment
- Steppage gait: exaggerated hip and knee flexion to clear the foot
- Foot slap: uncontrolled foot descent at heel strike
- Circumduction gait: leg swings outward to clear the toe
- Use timed up and go (TUG) test and 10-metre walk test to quantify
4. Motor Assessment
MRC (Medical Research Council) Scale 0–5 applied to each muscle group:
| Muscle Group | Nerve Division | Root |
|---|---|---|
| Dorsiflexors (tibialis anterior) | Common peroneal | L4/L5 |
| Toe extensors (EHL, EDL) | Deep peroneal | L5 |
| Evertors (peroneals) | Superficial peroneal | L5/S1 |
| Plantarflexors (gastrocnemius/soleus) | Tibial | S1/S2 |
| Invertors (tibialis posterior) | Tibial | L4/L5 |
| Knee flexors (hamstrings) | Sciatic (proximal) | L5/S1 |
Grade and document each group separately to map the level and completeness of the lesion.
5. Sensory Assessment
- Light touch (cotton wool) and pin prick along dermatomes:
- Lateral leg (L5/superficial peroneal)
- Dorsum of foot (L4/L5)
- Sole of foot (S1/tibial)
- Web space 1st–2nd toe (deep peroneal — specific)
- Two-point discrimination: assesses fine sensory recovery
- Vibration sense (128 Hz tuning fork): S1 — heel/malleolus
- Proprioception: passive toe/ankle movement with eyes closed
6. Reflex Testing
| Reflex | Root | Expected Finding |
|---|---|---|
| Knee jerk | L3/L4 | Preserved (femoral nerve — unaffected) |
| Ankle jerk | S1/S2 | Absent or diminished |
7. Range of Motion (ROM)
- Passive ROM: ankle dorsiflexion, plantarflexion, inversion, eversion
- Active ROM: compared with passive — deficit indicates weakness not contracture
- Goniometry for objective measurement
- Monitor for equinus contracture (loss of passive dorsiflexion) — a key complication of untreated foot drop
8. Special / Neurodynamic Tests
| Test | Purpose |
|---|---|
| Straight Leg Raise (SLR) | Sciatic nerve mechanosensitivity; positive <70° with pain/paraesthesia |
| Slump Test | Sensitised SLR; tests whole sciatic tract |
| FAIR Test (Flexion, Adduction, Internal Rotation) | Piriformis syndrome |
| Neural tension testing | Assess adverse neural mechanics |
9. Functional & Outcome Measures
| Outcome Measure | Use |
|---|---|
| VAS / NRS | Pain intensity |
| Timed Up and Go (TUG) | Mobility and fall risk |
| 10-Metre Walk Test | Gait speed |
| Foot and Ankle Disability Index (FADI) | Functional status |
| Lower Extremity Functional Scale (LEFS) | Overall LE function |
| Oswestry Disability Index | If lumbar involvement |
PART B: PHYSIOTHERAPY MANAGEMENT
Principles
Management is guided by Sunderland grade, phase of recovery, and functional goals. Physiotherapy runs across all phases — even post-surgical.
Phase 1: Acute / Protective Phase (0–6 Weeks)
Goals: prevent complications, maintain joint mobility, manage pain, protect nerve
| Intervention | Rationale |
|---|---|
| Ankle-Foot Orthosis (AFO) | Maintains neutral dorsiflexion; prevents equinus contracture; enables safe walking |
| Passive ROM exercises | Prevent contractures at ankle and subtalar joints |
| Positioning advice | Avoid prolonged pressure over nerve; elevate limb |
| Oedema management | Elevation, compression garments if applicable |
| Pain management | TENS (transcutaneous electrical nerve stimulation), ice/heat |
| Patient education | Skin inspection (insensate areas), fall prevention, footwear advice |
| Gentle stretching | Gastrocnemius-soleus stretches to maintain dorsiflexion ROM |
Phase 2: Recovery / Reinnervation Phase (6 Weeks – 6 Months)
Goals: restore motor and sensory function, improve gait, re-educate muscles
Electrical Stimulation
- Neuromuscular Electrical Stimulation (NMES / FES — Functional Electrical Stimulation):
- Applied to anterior tibial compartment
- Stimulates dorsiflexors to prevent atrophy during denervation
- FES can be used during walking to trigger dorsiflexion in swing phase (therapeutic + functional)
- Faradic stimulation: maintain muscle bulk in partially denervated muscle
Therapeutic Exercise
| Exercise | Purpose |
|---|---|
| Active-assisted dorsiflexion | Re-educate once reinnervation begins |
| Resisted eversion / dorsiflexion (theraband) | Strengthen weak muscles progressively |
| Calf raises | Restore plantarflexion strength |
| Hamstring curls | Proximal sciatic function |
| Proprioceptive training (wobble board, single-leg stance) | Restore joint position sense |
| Closed kinetic chain exercises | Functional lower limb loading |
Sensory Re-education
- Desensitisation: progress from soft to rough textures on recovering skin
- Discrimination training: textures, shapes, temperature identification
- Mirror therapy / graded motor imagery: if central sensitisation component
Gait Retraining
- Correct steppage pattern as dorsiflexion recovers
- Parallel bar walking → stick → independent
- Treadmill training with body weight support if needed
- FES during gait (Bioness L300, WalkAide) for foot drop
Neurodynamic Mobilisation
- Sciatic nerve slider / tensioner techniques: mobilise adherent nerve in scar tissue post-surgery or trauma
- Performed gently within symptom-free range
Phase 3: Functional / Return to Activity Phase (6 Months+)
Goals: maximise function, return to work/sport, manage residual deficit
- Progressive resistance training: targeting residual weakness
- Balance and proprioception: advanced single-leg tasks, sport-specific drills
- Hydrotherapy: buoyancy unloads limb; early gait training in water
- Vocational rehabilitation: ergonomic advice, graded return to work
- Permanent AFO: if no functional recovery of dorsiflexion expected
- Falls prevention programme: especially in elderly
Post-Surgical Physiotherapy (After Nerve Repair / Tendon Transfer)
| Procedure | Physiotherapy Role |
|---|---|
| Nerve repair / graft | Protect repair; serial motor/sensory re-assessment; NMES; sensory re-education |
| Tibialis posterior tendon transfer (foot drop) | Re-education of transferred tendon in new role; gait retraining |
| Ankle arthrodesis | Post-op ROM of adjacent joints; gait retraining with fused ankle; footwear advice |
Summary Table
| Phase | Key PT Interventions |
|---|---|
| Acute | AFO, passive ROM, TENS, positioning, education |
| Recovery | NMES/FES, active exercises, sensory re-education, neurodynamics, gait retraining |
| Functional | Resistance training, proprioception, hydrotherapy, return to activity |
| Post-surgical | Nerve/tendon re-education, gait retraining, long-term orthosis |
Exam tip: Always link your PT assessment to function (e.g., "foot drop assessed using TUG and 10MWT, not just MRC grading") and link your PT management to the phase of healing. Mentioning FES for foot drop, neurodynamic mobilisation, and sensory re-education alongside conventional exercise scores well in a 10-marker.
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