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The Wrist Dropped Overnight. The Nerve Will Take Its Time. Your Hand Doesn’t Have To.
A wrist drop splint holds your wrist, and often your knuckles, lifted while the RADIAL NERVE recovers, so the hand can still grip and let go. Most people wear a functional splint by day and a static wrist splint at night until the wrist lifts on its own.
After a “Saturday night” compression palsy, that’s usually weeks to about 3 months. After an upper arm (humerus) fracture, often 3 to 6 months or longer. No sign of recovery by 3 to 4 months means nerve testing and a surgeon’s opinion.
Here’s what you’re living with. The wrist won’t lift. The fingers bend fine but hang at the knuckles when you try to straighten them. You pick up a cup and it slides out, cos a bent wrist makes a weak grip. Try it: make a hard fist with your wrist bent forwards. Weak, right? That’s every grip with wrist drop.
Get the waiting wrong and two things go. The joints stiffen in the dropped position, and the paralyzed muscles on the back of the forearm get stretched long while they can’t fight back. Then the nerve wakes up months later to a hand that can’t use it.
The nerve’s timeline is out of your hands. Those two problems are not.
Why does the hand stop working with wrist drop?
- The radial nerve powers the muscles that lift the wrist, the knuckles and the thumb. See the hand nerve map.
- When it fails, the wrist drops, the fingers hang at the knuckles, and the thumb can’t lift away.
- Grip needs the wrist held up. The finger-bending muscles are fine. They just can’t pull hard on a wrist that’s flopped forwards.
- The middle and end finger joints still straighten once the knuckles are supported, because other nerves power those small muscles.
- Feeling is often only patchy, a numb strip over the back of the thumb and hand. Movement is the big loss.
Hold the wrist up and most of the grip comes back, even while the nerve is still asleep.
What causes radial nerve palsy?
- Compression at the upper arm, from sleeping with the arm hung over a chair back or pinned under a partner. Often called Saturday night palsy. Crutches pushed hard into the armpit can do it too.
- Fractures of the upper arm shaft, where the nerve wraps around the bone. Most of these palsies are the nerve being stretched or bruised, not cut, and most recover on their own. See the humeral fracture brace.
- Injury or compression near the elbow. When only the finger and thumb lifters are weak and the wrist still lifts, it’s a different branch. See PIN palsy.
- Cuts and surgery around the arm and elbow.
(A wrist drop with no arm injury, no pressure event and no clear story needs a doctor to sort out where it’s coming from. The neck and the brain can both produce one.)
How long does radial nerve palsy take to recover?
It depends on how badly the nerve was hurt. Your doctor may not know which one you have for the first few weeks.
- Compressed or bruised (neurapraxia): the nerve is intact, the signal is just blocked. Recovery takes days to weeks, usually within about 3 months. Most Saturday night palsies sit here.
- Stretched or crushed, with fibers damaged (axonotmesis): the fibers regrow from the injury site at roughly 1 mm a day, about an inch a month. Muscles wake up in order, nearest first. After a humerus fracture, many people start to recover within the first 3 months and get most of it back over 3 to 6 months. The last muscles, for the thumb and index finger, can take up to a year.
- Cut (neurotmesis): it won’t recover without surgery. See tendon transfers for one of the routes.
When are nerve tests or surgery considered?
- Nerve conduction and EMG: not useful in the first few weeks, because the damage takes about 3 weeks to show on testing. Often done around 3 to 4 months if there’s no sign of recovery on examination. EMG can pick up a waking muscle before you can see it move. See nerve conduction test results explained.
- Exploring the nerve: considered around 3 to 6 months with no recovery on examination or testing. Sooner if there was an open wound, or the palsy appeared after a fracture was manipulated or operated on. That’s your surgeon’s call.
- Tendon transfers: when the nerve isn’t coming back, working muscles are rerouted to lift the wrist, fingers and thumb.
Which splint is best for wrist drop?
- Static wrist cock-up splint: wrist held up about 20 to 30 degrees, fingers free. Simple, and often enough for light use and nights. The catch: the knuckles still hang, so letting go of things is clumsy. See the wrist cock-up splint.
- Dynamic knuckle extension splint: slings under the fingers on springs or elastic lift the knuckles while you grip against them, then open the hand when you relax. Works well, but it’s bulky and catches on sleeves. See dynamic splints.
- Low-profile tenodesis splint: cords link the fingers to a forearm cuff. Make a fist and the cords pull the wrist up. Relax and let the wrist dip, and the cords lift the fingers so the hand opens. Light enough to wear all day and type in.
- Off-the-shelf wrist brace: often what people get first. Fine as a stopgap if it has a firm stay holding the wrist up. It does nothing for the fingers.
How long do you wear a wrist drop splint, day and night?
- Daytime: the functional splint (cock-up, dynamic or tenodesis) whenever you’re using the hand. Off for washing, skin checks and exercises.
- Night: a static wrist splint holding the wrist up, so the sleeping muscles on the back of the forearm aren’t stretched for 8 hours and the wrist doesn’t stiffen bent.
- Overall: until the wrist can lift against gravity on its own and hold up during light grip. Then wean: off for light tasks first, still on for heavy gripping and at night for a few more weeks. Your therapist tests this, not the calendar.
- The thumb: if it sits pulled in against the index finger, a thumb piece on the splint or a soft spacer at night keeps the web open. See the C-bar splint.
(If your arm is in a sling or collar and cuff for a fracture, the wrist hangs bent inside it all day. Ask whether a wrist splint can go on underneath.)
What exercises keep the hand ready while the nerve recovers?
Hold the wrist up, keep the joints moving, and give the nerve its time. Three times a day, unless your fracture protocol says otherwise:
- Assisted lifts. With your other hand, lift the wrist fully up, then straighten each finger at the knuckle. Hold 5 to 10 seconds, 10 times. This keeps the joints supple.
- Thumb out and up. Move the thumb through its full range with your other hand, then stretch the web gently. 10 times.
- Don’t overstretch the sleeping side. Avoid long, hard stretches that pull the wrist down and the fingers into a tight fist at the same time. Those muscles can’t protect themselves right now.
- Use the hand in the splint. Light everyday tasks keep the grip muscles strong and keep your brain using that hand.
- Test for the first flicker once a day. Rest your forearm on the table on its little finger side and try to move the wrist backwards. A weak muscle can slide the hand sideways along the table long before it can lift it against gravity.
- Protect numb skin on the back of the thumb and hand from hot cups, ovens and the stove.
What are the signs the radial nerve is recovering?
The nerve wakes up from the top down, a bit like a slow stadium wave rolling down the arm.
- A moving tingle. Tapping along the nerve produces a tingle that creeps further down the arm over the weeks. That’s regrowth on the move.
- Brachioradialis first. It’s the muscle on the thumb side of the forearm, just below the elbow. Bend the elbow with the thumb pointing up against resistance and feel for it tightening. It’s usually the first to come back.
- Then the wrist. First sliding sideways on the table, then lifting against gravity.
- Then the knuckles straighten, then the thumb lifts. The index finger and thumb are usually last.
- The numb patch shrinks.
No change at all by 3 to 4 months is not a reason to keep waiting quietly. It’s the point where testing and a surgeon’s opinion come in, while the options are still open.
This is one of dozens of splints a hand therapist makes. See what a hand therapist does for the full list.
Get it checked today if
- Wrist or hand weakness comes on suddenly with a drooping face, slurred speech, leg weakness or confusion. Call emergency services or go to the ER now. That’s a possible stroke, not a nerve in the arm.
- The wrist drop appeared after a fracture was manipulated, a cast or brace went on, or after surgery. Your surgeon needs to know the same day.
- The splint leaves a mark still there 30 minutes after removal, a blister or broken skin, or the fingers go white, blue, cold or newly numb in it.
Get it checked if
- Weakness spreads, or fingers beyond the back of the thumb and hand go numb.
- Both hands are affected, or there was no injury or pressure event to explain it.
- No recovery at all after 3 months.
- The wrist or fingers are getting stiffer despite the exercises.
The nerve sets the timeline. You decide what shape the hand is in when it gets there.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. A wrist drop with no sign of recovery by 3 months deserves nerve testing and a surgeon’s opinion, not more waiting.
Part of: Hand, wrist and elbow splints: which one, why and how long
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.