EMERGENCY:Radial nerve palsy from a humeral fracture requires urgent assessment. In Holstein-Lewis fractures (spiral fractures of the distal humerus), the radial nerve may be trapped in the fracture site and require surgical exploration. Progressive worsening of wrist drop after fracture treatment needs NCS/EMG and surgical review at KIMS. —call040-46324365immediately — 24 hours, 7 days— 24/7
Radial Nerve Palsy in Hyderabad: Wrist Drop That Appeared Overnight — What It Means, How Long It Takes to Recover, and When Surgery Is Needed
Expert clinical level localisation of the radial nerve lesion, NCS/EMG at 3–4 weeks for severity grading, MRI when a structural cause is suspected, immediate cock-up wrist splinting at the first visit, physiotherapy with electrical stimulation, structured serial monitoring with defined surgical thresholds, and surgical exploration with nerve grafting or neurolysis when spontaneous recovery fails — at KIMS Neuroscience, Secunderabad, Hyderabad.
Radial nerve palsy is weakness of the muscles supplied by the radial nerve, most characteristically producing wrist drop (inability to extend the wrist and fingers against gravity). The radial nerve winds around the spiral groove of the humerus, where external compression (Saturday night palsy from sleeping with the arm over a chair) produces neurapraxia. In India: deep medicated sleep from sedating antihistamines or benzodiazepines; motorcycle journeys with the arm resting on the fuel tank. The Holstein-Lewis fracture (spiral fracture of the distal humerus) can trap the radial nerve within the fracture site, requiring surgical exploration if no recovery at 6–8 weeks. The radial nerve gives off its branch to brachioradialis at or around the spiral groove (within or at its exit), not proximal to it. Despite this, brachioradialis is often relatively spared in spiral groove compression — intact elbow flexion in neutral position is a useful sign that the lesion is at the spiral groove level rather than more proximally in the upper arm. PIN palsy: finger drop with PRESERVED wrist extension (extensor carpi radialis longus branch exits before the PIN). Most Saturday night palsy cases recover completely in 3–6 months without surgery.
- Saturday night palsy — India context
- Radial nerve compressed at the spiral groove of the humerus from sleeping with the arm draped over a hard surface. India context: deep sleep from sedating antihistamines or benzodiazepines; arm resting on motorcycle fuel tank for hours. Wrist drop discovered on waking.
- Brachioradialis sparing = spiral groove level
- The radial nerve gives off its branch to brachioradialis at or around the spiral groove — not above it. If brachioradialis is INTACT (elbow can be flexed with forearm in neutral), the lesion is at the SPIRAL GROOVE or at its exit level. Brachioradialis is often relatively spared in typical spiral groove compression, making this a useful clinical level localiser. If brachioradialis is ALSO weak, the lesion is in the UPPER ARM or axilla.
- PIN palsy — finger drop with preserved wrist extension
- PIN (posterior interosseous nerve) = deep motor branch supplying finger extensors, thumb extensors. Wrist extension preserved (ECRL branch exits before PIN). If only the fingers cannot extend but wrist extension is intact = PIN compression at the radial tunnel (arcade of Frohse).
- Holstein-Lewis fracture = emergency
- Spiral fracture of the distal humerus · Radial nerve injured in 11–18% of humeral shaft fractures · If the nerve is TRAPPED in the fracture site, it will not recover without surgical exploration · KIMS threshold: no recovery by 6–8 weeks post-fracture treatment
- NCS/EMG at 3–4 weeks (not immediately)
- Denervation changes (fibrillation potentials) take 3–4 weeks to appear on EMG. NCS immediately after injury often shows only conduction block. At 3–4 weeks: amplitude reduction (axon loss = worse prognosis) vs preserved amplitude (neurapraxia = excellent prognosis, no surgery needed).
- Proximal-to-distal recovery
- Wrist extensors recover BEFORE finger extensors because their branches exit more proximally (shorter regeneration distance). Wrist recovery at 3 months but fingers still not extending = normal timing, not a failure. Full sequence recovery may take 5–6 months.
- Cock-up wrist splint — day one
- Thermoplastic dorsal splint holding wrist at 30–40 degrees of extension · Restores functional hand position for grip while nerve recovers · Prevents wrist flexion contracture · Prescribed at KIMS at the FIRST visit
| Fact | Details |
|---|---|
| Saturday night palsy | Radial nerve compressed at spiral groove · Neurapraxia in most cases · Complete spontaneous recovery in 3–6 months · India context: sedating antihistamines, motorcycle fuel tank |
| Level localisation | Brachioradialis intact = spiral groove or below · Brachioradialis weak = above spiral groove or axilla · Wrist extension intact + finger drop only = PIN level |
| PIN palsy | Finger and thumb extension weak + wrist extension PRESERVED · PIN at arcade of Frohse (supinator) · No sensory loss · Conservative 3–6 months then PIN decompression at KIMS |
| Holstein-Lewis | Spiral distal humeral fracture · 11–18% have radial nerve injury · Nerve may be trapped in fracture · No recovery at 6–8 weeks: surgical exploration at KIMS |
| NCS/EMG timing | At 3–4 weeks (NOT immediately) · CMAP amplitude reduction = axon loss (worse prognosis, longer recovery) · Normal amplitude = neurapraxia (good prognosis, no surgery) |
| Cock-up splint | Thermoplastic dorsal splint 30–40 degrees · Prescribed at first visit · Restores grip function while nerve recovers · Prevents contracture |
| Surgical threshold | No clinical or NCS/EMG recovery by 3–6 months (compressive) · No recovery by 6–8 weeks after humeral fracture treatment · Known structural cause (lipoma, ganglion) |
About This Condition
Radial Nerve Palsy at a Glance
The essential facts that shape how radial nerve palsy is recognised and managed at KIMS — what the radial nerve supplies, why the spiral groove is its most vulnerable compression point, the India-specific mechanisms of Saturday night palsy, and why the prognosis for most patients is excellent.
What it is
Radial nerve palsy is weakness or paralysis of the muscles supplied by the radial nerve, most characteristically producing wrist drop — the inability to extend the wrist and fingers against gravity. The radial nerve (C5–C8, posterior cord of the brachial plexus) is the main extensor nerve of the upper limb, supplying the triceps, brachioradialis, and all the wrist and finger extensors. It is the most commonly injured nerve in the upper limb from external compression.
The spiral groove
The radial nerve winds around the posterior humerus in the spiral groove — a shallow sulcus on the outer surface of the mid-humerus where the nerve lies in intimate contact with bone. This makes the radial nerve uniquely vulnerable to compression from external pressure: resting the arm over the back of a chair, having someone's head resting on the upper arm during sleep (honeymoon palsy), or prolonged deep sleep with the arm in an awkward position (Saturday night palsy). The radial nerve gives off its branch to brachioradialis at or around the spiral groove (at its exit or just distal to the groove), not proximal to it. Brachioradialis is often relatively spared in spiral groove compression, which aids level localisation.
Saturday night palsy — India context
Saturday night palsy is named after the pattern of falling into a deep sleep with the arm draped over a hard surface. In India, common mechanisms beyond alcohol: deep medicated sleep (from sedating antihistamines, benzodiazepines, or exhaustion), and motorcycle journeys where the arm rests on the fuel tank for hours. The key feature: wrist drop discovered on waking, with no prior trauma.
Prognosis — most recover
The vast majority of Saturday night palsy cases recover completely without surgery. The compression is a neurapraxia (disruption of myelin with intact axons) — once the pressure is removed, the nerve recovers. Recovery begins within days to weeks and is complete in 3–6 months in most cases. NCS/EMG at 3–4 weeks classifies the severity and guides prognosis.
Appointment
040-44885000
The Wrist That Would Not Lift After Diwali Night
A 35-year-old IT professional in Hyderabad woke on Diwali morning to find that his right wrist would not lift and his fingers would not extend. He had attended a party the previous evening and fallen into a deep sleep on a sofa with his right arm draped over the armrest at an awkward angle for several hours. No pain, no neck pain, no other neurological symptoms.
At KIMS: right wrist drop confirmed — the right wrist falls into flexion when the arm is extended with the palm facing down. He cannot extend the wrist against gravity. Finger MCP joint extension: absent. Thumb extension: absent. Brachioradialis: intact (he can flex the elbow with the forearm in neutral — confirming the lesion is at spiral groove level and not higher). Triceps: intact. Sensory: reduced over the dorsum of the thumb and first web space.
Clinical diagnosis: right radial nerve palsy at the spiral groove. A cock-up wrist splint is prescribed immediately. NCS/EMG arranged for 3–4 weeks (not immediately — denervation changes take 3–4 weeks to appear on EMG).
NCS/EMG at 4 weeks: radial nerve motor conduction amplitude reduced 70% across the spiral groove; EMG: mild denervation in extensor digitorum communis. Predominantly axonotmesis — predicts a longer recovery but still an excellent prognosis. At 3 months: wrist extension returning grade 3/5. At 5 months: full recovery. Splint discontinued.
Book a Consultation
Speak directly with The KIMS Neuroscience team and the KIMS radial nerve specialist team — neurosurgery, hand and peripheral nerve surgery, clinical neurophysiology (NCS/EMG), neuroradiology, occupational therapy and splinting, and physiotherapy coordinated under one roof. No referral required. Monday to Saturday.
040-44885000Emergency line: 040-46324365Clinical Features and Levels
The four pillars of clinical recognition at KIMS — wrist drop as the defining presentation, brachioradialis sparing as the level localiser, posterior interosseous nerve palsy with preserved wrist extension, and the special considerations after a humeral shaft fracture.
Wrist drop — the defining presentation
Wrist drop (inability to extend the wrist against gravity) is the signature finding of radial nerve palsy at the spiral groove or below. The wrist falls into passive flexion from gravity and the unopposed wrist flexors. Finger extension at the MCP joints is also lost. Thumb extension is lost. Fine motor function and grip strength are dramatically reduced because functional grip requires the wrist to be held in extension.
Brachioradialis sparing — the level localiser
The radial nerve gives off its branch to brachioradialis at or around the spiral groove — not above it. Despite this, brachioradialis is often relatively spared in typical spiral groove compression (Saturday night palsy). The patient can flex the elbow with the forearm in neutral, and this finding helps localise the lesion to the spiral groove level. If the brachioradialis is also weak, the lesion is above the spiral groove in the upper arm or at the axilla — a more extensive injury with different causes (axillary crutch palsy, tourniquet palsy, posterior cord brachial plexus injury).
Posterior interosseous nerve (PIN) palsy — finger drop with preserved wrist extension
The PIN is the deep motor branch of the radial nerve, supplying the finger and thumb extensors after the radial nerve bifurcates at the elbow. PIN compression produces: weakness of finger and thumb extension with normal wrist extension (the wrist extensor branch exits before the PIN). This preserved wrist extension distinguishes PIN palsy from spiral groove radial nerve palsy.
Humeral fracture and radial nerve injury
The radial nerve is injured in approximately 11–18% of humeral shaft fractures, particularly Holstein-Lewis fractures (spiral fractures of the distal third of the humerus). If the nerve is entrapped within the fracture fragments, it will not spontaneously recover even if the fracture heals — surgical exploration is required. At KIMS, any patient with wrist drop following a humeral fracture and no clinical recovery within 6–8 weeks of fracture treatment receives surgical exploration.
Diagnosis at KIMS
Diagnosis at KIMS — Clinical Level Localisation, NCS/EMG & MRI
Radial nerve palsy is diagnosed at KIMS with a structured workflow that first localises the lesion clinically, then grades severity with timed NCS/EMG, and uses MRI when a structural cause is suspected :
Clinical examination — level localisation
Systematic examination of: brachioradialis (above spiral groove); wrist extensors (at or below spiral groove); finger extensors via PIN (below radial nerve bifurcation); thumb extension. Sensory examination: dorsal first web space (superficial radial sensory nerve). Each finding narrows the lesion to a specific level.
NCS/EMG at 3–4 weeks post-injury
Performed at 3–4 weeks (not immediately). NCS: radial motor conduction velocity and amplitude across the spiral groove. EMG of radial-innervated muscles at each level provides precise localisation and severity grading. Key finding: reduced compound muscle action potential (CMAP) amplitude indicates axon loss (worse prognosis); normal amplitude with reduced conduction velocity indicates neurapraxia (good prognosis, no surgery needed).
MRI of the upper arm or elbow
When a structural cause is suspected (lipoma at the radial tunnel, bony spur, ganglion, fracture fragment), MRI identifies the compressive lesion. At KIMS, MRI is arranged for PIN palsy (radial tunnel syndrome) and for radial nerve palsy without a clear compression mechanism.
Treatment
Treatment at KIMS
The KIMS radial nerve palsy programme is built around four integrated management areas — immediate functional restoration with a cock-up wrist splint, physiotherapy with electrical stimulation, structured observation with serial NCS/EMG, and surgical exploration with nerve grafting or neurolysis when recovery does not occur within the expected window.
Cock-Up Wrist Splint — Immediate Function Restoration: A cock-up wrist splint (thermoplastic dorsal splint holding the wrist in 30–40 degrees of extension) is prescribed at KIMS at the first visit for any patient with wrist drop. The splint restores the functional hand position, allowing grip and pinch while the nerve recovers. It prevents wrist flexion contracture.
Physiotherapy: Passive and active-assisted range of motion exercises; electrical stimulation of the denervated extensors; and progressive active extension exercises as recovery begins.
Observation and Serial NCS/EMG: For Saturday night palsy and other compressive palsies: monthly clinical assessment. Repeat NCS/EMG at 3 and 6 months to document nerve recovery. If clinical recovery begins within 6–8 weeks, the prognosis is excellent and surgery is not required.
Surgical Exploration — When Recovery Fails: Indications at KIMS: no clinical or NCS/EMG evidence of recovery by 3–6 months after a compressive injury; radial nerve palsy from a humeral fracture with no recovery by 6–8 weeks; or a known structural cause requiring removal. At surgery: the nerve is explored, compression released, and nerve grafting or neurolysis performed as indicated.
Related Conditions
Radial nerve palsy belongs to the family of peripheral nerve disorders evaluated and managed at KIMS Neuroscience. Explore related peripheral nerve conditions or return to the peripheral nerve disorders hub.
FAQs
Frequently Asked Questions
Wrist drop that appeared overnight — whether from a deep sleep on the sofa or from a humeral fracture.
At KIMS Neuroscience, Secunderabad, Hyderabad, radial nerve palsy is diagnosed with NCS/EMG, managed with a cock-up wrist splint and physiotherapy from day one, and monitored monthly with defined surgical thresholds for cases that do not recover. Most patients recover completely. Call 040-44885000.
International enquiries: info@kimsneurosciences.com