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Tinel sign Phalen test carpal tunnel median nerve
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elbow flexion test cubital tunnel ulnar nerve
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wrist drop radial nerve palsy Saturday night palsy
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Peripheral Nerve Injury Tests β Complete Guide
ποΈ MEDIAN NERVE TESTS
1. Tinel's Sign
Indication: Carpal tunnel syndrome (CTS) β and any median nerve compression
Technique: Gently tap (percuss) with two fingers over the carpal tunnel on the volar (palmar) surface of the wrist
Positive finding: Electric shock-like tingling shooting into the thumb, index, middle, and radial half of the ring finger
Mechanism: Percussion mechanically stimulates the irritated or regenerating median nerve fibers
Technique: Gently tap (percuss) with two fingers over the carpal tunnel on the volar (palmar) surface of the wrist
Positive finding: Electric shock-like tingling shooting into the thumb, index, middle, and radial half of the ring finger
Mechanism: Percussion mechanically stimulates the irritated or regenerating median nerve fibers
2. Phalen's Test (Phalen's Maneuver)
Indication: Carpal tunnel syndrome
Technique: Patient holds both wrists in maximal flexion (dorsal hands pressed together, fingers pointing down) for 60 seconds. This constricts the transverse carpal ligament and narrows the tunnel.
Positive finding: Reproduction of numbness, tingling, or pain in the median nerve distribution within 30β60 seconds
Technique: Patient holds both wrists in maximal flexion (dorsal hands pressed together, fingers pointing down) for 60 seconds. This constricts the transverse carpal ligament and narrows the tunnel.
Positive finding: Reproduction of numbness, tingling, or pain in the median nerve distribution within 30β60 seconds
3. Durkan Compression Test (Carpal Tunnel Compression Test)
Indication: Carpal tunnel syndrome β most sensitive provocative test for CTS
Technique: Examiner compresses the median nerve directly over the carpal tunnel (thumb on the palm, wrist in neutral) for up to 30β60 seconds
Positive finding: Reproduction of numbness, tingling, or pain in the median nerve distribution
Technique: Examiner compresses the median nerve directly over the carpal tunnel (thumb on the palm, wrist in neutral) for up to 30β60 seconds
Positive finding: Reproduction of numbness, tingling, or pain in the median nerve distribution
"Most sensitive provocative test: carpal tunnel compression test (Durkan test) with wrist in neutral position" β Miller's Review of Orthopaedics, 9th Ed.
4. "OK Sign" / Anterior Interosseous Nerve Test
Indication: Anterior interosseous nerve (AIN) entrapment (purely motor branch of median nerve)
Technique: Ask the patient to form a circle (the "OK sign") with the thumb and index finger
Positive finding: Inability to flex the thumb IP joint and index DIP simultaneously β the patient instead forms a "pinch" posture (precision sign); no sensory loss
Technique: Ask the patient to form a circle (the "OK sign") with the thumb and index finger
Positive finding: Inability to flex the thumb IP joint and index DIP simultaneously β the patient instead forms a "pinch" posture (precision sign); no sensory loss
5. Abductor Pollicis Brevis (APB) Test
Indication: Median nerve motor branch integrity at the wrist (thenar branch)
Technique: Place thumb in palmar abduction (palm up); patient resists force directed toward the palm. Palpate the APB belly to confirm contraction.
Positive finding: Weakness of thumb opposition/abduction = motor branch compromise
Technique: Place thumb in palmar abduction (palm up); patient resists force directed toward the palm. Palpate the APB belly to confirm contraction.
Positive finding: Weakness of thumb opposition/abduction = motor branch compromise
"The best muscle to test in suspected carpal tunnel syndrome is the abductor pollicis brevis, which abducts the thumb perpendicular to the plane of the palm." β Neuroanatomy Through Clinical Cases, 3rd Ed.
β ULNAR NERVE TESTS
6. Tinel's Sign at the Elbow
Indication: Cubital tunnel syndrome (ulnar nerve at medial epicondyle)
Technique: Tap over the cubital tunnel at the medial epicondyle
Positive finding: Pain or paresthesias shooting down the ulnar border of the forearm into the 4th and 5th fingers
Technique: Tap over the cubital tunnel at the medial epicondyle
Positive finding: Pain or paresthesias shooting down the ulnar border of the forearm into the 4th and 5th fingers
7. Elbow Flexion Test
Indication: Cubital tunnel syndrome
Technique: Hyperflexion of the elbow with shoulder flexed at 90Β°; maintain for 3 minutes. Elbow flexion tightens the cubital tunnel retinaculum and stretches the ulnar nerve.
Positive finding: Reproduction of pain, numbness, or tingling in the ulnar nerve distribution (5th and medial 4th finger)
Technique: Hyperflexion of the elbow with shoulder flexed at 90Β°; maintain for 3 minutes. Elbow flexion tightens the cubital tunnel retinaculum and stretches the ulnar nerve.
Positive finding: Reproduction of pain, numbness, or tingling in the ulnar nerve distribution (5th and medial 4th finger)
8. Froment's Sign
Indication: Ulnar nerve palsy (specifically tests adductor pollicis, which is ulnar-innervated)
Technique: Ask the patient to hold a piece of paper in a lateral (key) pinch between thumb and radial side of the index finger. Attempt to pull the paper away.
Positive finding: Patient flexes the thumb at the IP joint (using flexor pollicis longus, median-innervated) to compensate for a paralyzed adductor pollicis. IP flexion = positive Froment's sign.
Technique: Ask the patient to hold a piece of paper in a lateral (key) pinch between thumb and radial side of the index finger. Attempt to pull the paper away.
Positive finding: Patient flexes the thumb at the IP joint (using flexor pollicis longus, median-innervated) to compensate for a paralyzed adductor pollicis. IP flexion = positive Froment's sign.
9. Wartenberg's Sign
Indication: Ulnar neuropathy
Technique: Observe the patient's small (5th) finger at rest
Positive finding: Persistent abduction/extension of the small finger during attempted adduction β due to weakness of the 3rd palmar interosseous (ulnar) and unopposed pull of the extensor digiti quinti (radial nerve)
Technique: Observe the patient's small (5th) finger at rest
Positive finding: Persistent abduction/extension of the small finger during attempted adduction β due to weakness of the 3rd palmar interosseous (ulnar) and unopposed pull of the extensor digiti quinti (radial nerve)
10. Jeanne's Sign
Indication: Ulnar neuropathy
Technique: Observe thumb posture during key pinch
Positive finding: Thumb MCP hyperextension during key pinch β due to weak adductor pollicis (ulnar-innervated). Often accompanies Froment's sign.
Technique: Observe thumb posture during key pinch
Positive finding: Thumb MCP hyperextension during key pinch β due to weak adductor pollicis (ulnar-innervated). Often accompanies Froment's sign.
"Froment: thumb IP flexion during key pinch. Jeanne: thumb MCP hyperextension during key pinch. Wartenberg: abduction/extension of small digit during attempted adduction." β Miller's Review of Orthopaedics, 9th Ed.
11. Finger Abduction/Spread Test
Indication: Ulnar intrinsic weakness
Technique: Ask patient to spread fingers apart or cross middle over index finger; resist force pushing them to midline
Positive finding: Weakness confirms ulnar nerve motor branch deficit at or above the wrist level
Technique: Ask patient to spread fingers apart or cross middle over index finger; resist force pushing them to midline
Positive finding: Weakness confirms ulnar nerve motor branch deficit at or above the wrist level
π¦Ύ RADIAL NERVE TESTS
12. Wrist/Finger Extension Test
Indication: Radial nerve palsy or posterior interosseous nerve (PIN) injury
Technique: Place patient's palm flat on a table; ask them to lift each finger straight up (hyperextend MCP joints) against resistance
Positive finding: Inability to hyperextend the finger MCP joints = radial nerve or PIN injury. If the patient can weakly extend the wrist in a radial direction (ECRL/ECRB spared) but not extend fingers β PIN palsy (radial nerve proper is intact)
Classic sign: "Wrist drop" β inability to extend the wrist against gravity
Technique: Place patient's palm flat on a table; ask them to lift each finger straight up (hyperextend MCP joints) against resistance
Positive finding: Inability to hyperextend the finger MCP joints = radial nerve or PIN injury. If the patient can weakly extend the wrist in a radial direction (ECRL/ECRB spared) but not extend fingers β PIN palsy (radial nerve proper is intact)
Classic sign: "Wrist drop" β inability to extend the wrist against gravity
13. Extensor Pollicis Longus (EPL) Test
Indication: Radial nerve / PIN integrity
Technique: Ask patient to extend the thumb against resistance
Positive finding: Weakness or absence = PIN injury (EPL is innervated by the posterior interosseous nerve)
Technique: Ask patient to extend the thumb against resistance
Positive finding: Weakness or absence = PIN injury (EPL is innervated by the posterior interosseous nerve)
MEDIAN NERVE β Proximal Tests
14. Pronator Syndrome Provocative Tests
Indication: Median nerve compression in the proximal forearm (pronator teres level)
Three separate maneuvers isolate the compression site:
Three separate maneuvers isolate the compression site:
| Maneuver | Compression site |
|---|---|
| Resisted elbow flexion with forearm supinated | Bicipital aponeurosis (lacertus fibrosis) |
| Resisted forearm pronation with elbow extended | Between heads of pronator teres |
| Resisted long finger PIP flexion | FDS arch |
Key differentiator from CTS: Pronator syndrome causes sensory disturbances over the thenar eminence (palmar cutaneous branch, exits proximal to carpal tunnel); CTS spares thenar sensation.
π¦Ώ THORACIC OUTLET / LOWER LIMB NERVES
15. Adson Test
Indication: Thoracic outlet syndrome (vascular β subclavian vein/artery compression)
Technique: Patient hyperextends the neck and rotates it to the affected side; decreased radial pulse during inhalation
Positive finding: Diminished or absent radial pulse = positive
Technique: Patient hyperextends the neck and rotates it to the affected side; decreased radial pulse during inhalation
Positive finding: Diminished or absent radial pulse = positive
16. Peroneal Nerve Assessment
Indication: Deep peroneal nerve entrapment (fibular head, anterior tarsal tunnel)
Clinical sign: Foot drop (inability to dorsiflex the foot) + numbness in the web space between the 1st and 2nd toes
Causes: Proximal fibular fracture, habitual leg crossing, prolonged squatting
Clinical sign: Foot drop (inability to dorsiflex the foot) + numbness in the web space between the 1st and 2nd toes
Causes: Proximal fibular fracture, habitual leg crossing, prolonged squatting
Summary Table
| Test | Nerve | Site Tested | Positive Finding |
|---|---|---|---|
| Tinel's sign (wrist) | Median | Carpal tunnel | Tingling in digits 1β3.5 |
| Phalen's test | Median | Carpal tunnel | Tingling in digits 1β3.5 after 60 s wrist flexion |
| Durkan compression test | Median | Carpal tunnel | Tingling in digits 1β3.5 (most sensitive) |
| "OK sign" / AIN test | Median (AIN) | Forearm | Can't form circle β motor loss, no sensory loss |
| Tinel's sign (elbow) | Ulnar | Cubital tunnel | Tingling in digits 4β5 |
| Elbow flexion test | Ulnar | Cubital tunnel | Tingling in digits 4β5 within 3 min |
| Froment's sign | Ulnar | Adductor pollicis | Thumb IP flexion during key pinch |
| Wartenberg's sign | Ulnar | 3rd palmar interosseous | Small finger abduction at rest |
| Jeanne's sign | Ulnar | Adductor pollicis | Thumb MCP hyperextension during key pinch |
| Wrist drop / MCP extension | Radial | Spiral groove / PIN | No wrist/finger extension |
| Adson test | Brachial plexus | Thoracic outlet | Reduced radial pulse |
| Foot drop exam | Deep peroneal | Fibular head | Cannot dorsiflex foot |
Sources:
- Sabiston Textbook of Surgery, 21st Ed. β Table 119.3
- Miller's Review of Orthopaedics, 9th Ed. β Tables 7.8 and Compression Neuropathy section
- Tintinalli's Emergency Medicine, 9th Ed. β Focal Mononeuropathies chapter
- Neuroanatomy Through Clinical Cases, 3rd Ed. β Upper Extremity Nerve Injuries
- Thieme Atlas of Anatomy β General Anatomy and Musculoskeletal System
Scorpion bite black Indian variant management
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Indian black scorpion Heterometrus Palamneus sting management treatment
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Indian Black Scorpion (Heterometrus spp. / Palamneus spp.) β Management
Species Clarification: Red vs. Black
India has two medically important scorpion groups, which must be distinguished since their toxidromes and management differ significantly:
| Feature | Indian Red Scorpion (Hottentotta tamulus, formerly Mesobuthus tamulus) | Indian Black Scorpion (Heterometrus spp. / Palamneus spp.) |
|---|---|---|
| Family | Buthidae | Scorpionidae |
| Color | Red-orange/brown | Glossy black, large body |
| Toxin type | Neurotoxins + massive catecholamine storm | Primarily cytotoxic, milder systemic toxicity |
| Distribution | Maharashtra, Gujarat, Karnataka, Tamil Nadu | Northeast India, Kerala, Eastern states |
| Mortality | High (especially children) | Low β rarely life-threatening |
| Key danger | Acute pulmonary edema, cardiogenic shock | Local pain, swelling; mild systemic effects |
The Indian black scorpion (Heterometrus bengalensis, H. swammerdami, Palamneus gravimanus) belongs to Scorpionidae β NOT Buthidae. Its venom is predominantly cytotoxic/local rather than neurotoxic, and it rarely causes the catecholamine storm that makes red scorpion envenomation so dangerous. β [Indian Black Scorpion Venom Action, Avens Online]
π¦ Pathophysiology of Black Scorpion Venom
- Venom contains cytotoxic proteins, phospholipases, hyaluronidases, and weak sodium channel toxins
- Causes local tissue damage, pain, and edema β systemic toxicity is uncommon
- Rarely triggers cardiovascular effects (contrast with Buthidae)
- Large volume of venom can be injected due to larger body size, occasionally causing more severe local reactions
Clinical Features
Grade 1 (Local only β most common)
- Immediate sharp pain at sting site
- Local erythema, edema, tenderness
- Paresthesias spreading proximally
- No systemic features
Grade 2 (Mild systemic)
- Profuse sweating, nausea, vomiting
- Mild tachycardia
- Anxiety, restlessness
- No hemodynamic compromise
Grade 3 (Severe β rare with black scorpion)
- Significant cardiovascular or neurological involvement
- Pulmonary edema (rare but documented)
- Severe autonomic disturbance
Local and systemic symptoms are typically out of proportion to cutaneous signs β erythema and edema at the sting site are not usually prominent. β Fitzpatrick's Dermatology, 9th Ed.
(The above β VT + pulmonary edema β represents Buthidae envenomation. Black scorpion stings rarely cause this degree of cardiovascular toxicity.)
Management
Immediate / Prehospital
- Calm the patient β anxiety worsens symptoms; reassure that black scorpion stings are rarely fatal
- Identify the scorpion if possible β this determines the treatment pathway
- Do NOT apply tourniquets, incise the wound, or apply electric shock (no evidence of benefit)
- Apply a cold pack / ice pack to the sting site β reduces local pain and venom absorption
- Immobilize the affected limb
- Transport to hospital in all children and any patient with systemic features
Emergency Department Management
Step 1 β Assess grade of envenomation
- Full vital signs, ECG, pulse oximetry
- Neuro exam (cranial nerve function, muscle activity)
- Labs if systemic features: CBC, RFT, LFT, serum electrolytes, troponin, CXR
Step 2 β Pain Control (Grade 1 and all patients)
| Agent | Dose | Route |
|---|---|---|
| Paracetamol | 10β15 mg/kg (child); 500β1000 mg (adult) | Oral/IV |
| NSAIDs (ibuprofen, ketorolac) | Standard doses | Oral/IV |
| Local infiltration of lidocaine (without epinephrine) | 1β2 mL of 1β2% | At sting site |
| Opioids (fentanyl/morphine) | For severe pain | IV |
Acetaminophen, NSAIDs, and local lidocaine (without epinephrine) at the sting site are first-line for local pain. Opioid analgesia may be necessary for more severe symptoms. β Tintinalli's Emergency Medicine, 9th Ed.
Step 3 β Sedation for Agitation / Neuromuscular Hyperactivity
- Benzodiazepines (midazolam, diazepam) for anxiety, muscle hyperactivity, restlessness
- Continuous IV midazolam infusion reduces agitation and involuntary movements
"A continuous IV infusion of midazolam reduces the agitation and involuntary movements produced by scorpion stings." β Harrison's Principles of Internal Medicine, 22nd Ed.
Step 4 β Cardiovascular Management (if systemic features develop)
| Condition | Drug | Notes |
|---|---|---|
| Hypertension + tachycardia (catecholamine excess) | Prazosin (Ξ±1-blocker) | Key drug in India β 250β500 mcg (child) or 500 mcgβ1 mg (adult) sublingual/oral, can repeat 3-hourly |
| Pulmonary edema | Prazosin + nitroglycerin or nitroprusside | Reduces preload/afterload |
| Cardiogenic shock | Dobutamine | Inotropic support |
| Bradycardia + cholinergic symptoms (Tityus/Parabuthus pattern β rare in India) | Atropine | Only if vagal-dominant picture |
"Prazosin reverses the autonomic storm characteristic of Indian red scorpion (Hottentotta tamulus) envenomation, resulting in accelerated recovery and preserved myocardial function." β Fitzpatrick's Dermatology, 9th Ed.
"Prazosin has been effective, especially in addition to antivenom, for treatment of catecholamine excess and cardiovascular compromise in Mesobuthus tamulus stings." β Rosen's Emergency Medicine, 9th Ed.
Note: For the black scorpion (Heterometrus), cardiovascular crisis is uncommon β but prazosin should be used if hypertension or pulmonary edema appears.
Step 5 β Antivenom
- Indian polyvalent scorpion antivenom (CSL Ltd / Central Research Institute, Kasauli) is available in India
- Produced against Hottentotta tamulus (red scorpion) β its efficacy against Heterometrus (black scorpion) is limited
- Antivenom is not routinely indicated for black scorpion envenomation
- Indicated when: severe systemic features, cardiovascular instability, neuromuscular dysfunction
- If administered: IV, diluted in NS, given slowly with resuscitation available
- Risk of anaphylaxis and serum sickness (equine-derived)
"Antivenin is available in endemic areas and, along with supportive care, has been shown to reduce morbidity and mortality from severe scorpion envenomation." β Fitzpatrick's Dermatology, 9th Ed.
"Role of antivenom not clear once systemic toxicity established, as antivenom binds toxin but does not reverse established injury." β Tintinalli's Emergency Medicine, 9th Ed.
Supportive Care
- Airway management if hypersalivation + cranial nerve dysfunction compromise airway (more relevant in red scorpion)
- IV fluids for hemodynamic support β cautiously (pulmonary edema risk)
- Tetanus prophylaxis if not up-to-date
- Antihistamines for local allergic component
- Monitor for secondary complications: rhabdomyolysis, pancreatitis, renal failure (rare with black scorpion)
Disposition
| Grade | Disposition |
|---|---|
| Grade 1 (local only) | Observe 2β4 hours; discharge with analgesia and return precautions |
| Grade 2 (mild systemic) | Admit for 12β24 hours monitoring, prazosin if needed |
| Grade 3 (severe) | ICU admission, consider antivenom, intensive monitoring |
| All children | Admit for at least 12β24 hours (children have more severe course) |
Quick Summary: Black Scorpion vs. Red Scorpion Management Differences
| Aspect | Black Scorpion (Heterometrus) | Red Scorpion (Hottentotta tamulus) |
|---|---|---|
| Prazosin | Only if cardiovascular features | Cornerstone drug β use early |
| Antivenom | Rarely needed; limited species-specific efficacy | Indicated for systemic toxicity |
| ICU | Rarely needed | Frequently needed in children |
| Mortality | Very low | Significant (especially children <10 yrs) |
| Main concern | Local pain, rarely systemic | Pulmonary edema, cardiogenic shock |
Sources:
- Harrison's Principles of Internal Medicine, 22nd Ed. β Scorpion Stings
- Rosen's Emergency Medicine, 9th Ed. β Scorpions chapter
- Tintinalli's Emergency Medicine, 9th Ed. β Table 211-2
- Fitzpatrick's Dermatology, 9th Ed. β Selected Scorpion Species
- Kumar R. An update on epidemiology and management of scorpion envenomation in India. J Fam Med Prim Care 2022 [PMID: 36505581]
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