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A Millimeter a Day, and a Sign You Can Track Yourself
A repaired nerve in the hand regrows at roughly 1 millimeter a day, about an inch a month, once it gets going. The repair is usually protected in a splint for 3 to 4 weeks, longer if a tendon was repaired too. Feeling returns over months, and the final result takes 12 to 24 months to judge. Most adults regain protective feeling. Fully normal feeling is less common.
A cut nerve in your hand or wrist has been stitched back together, or a gap has been bridged with a graft.
The operation took a couple of hours…but the nerve isn’t healed or connected the moment you wake up.
Real recovery takes a year or two…sometimes longer.
That’s not slow surgery. It’s just that stitching a nerve doesn’t restore it. It builds a bridge, and then thousands of nerve fibers have to grow across that bridge and travel all the way down to the skin and muscle they used to supply.
They do that at roughly one millimeter a day. About an inch a month. Measure from your scar to your fingertip and you’ll have a rough idea of the timescale you’re dealing with.
Even then, it may not reconnect or work like before. It’s the same reason people who injure their spinal cord don’t always get back the ability to stand, walk or run. Nerve cells are a different animal from muscle and bone, which heal comparatively fast.
Here’s what goes wrong if nobody tells you this. People judge the hand at three months, decide it failed, and stop doing the work that decides the final result. Or they burn a numb fingertip on a pan in month two and never feel it happen.
What nerve repair surgery actually did
Nerves in the hand are cables of thousands of tiny fibers inside a protective sleeve. A cut, usually from glass, a knife or a tool, divides the cable. The surgeon lines up the sleeve and stitches it with sutures finer than a hair, under a microscope. If the ends can’t meet without tension, a graft (often a small nerve taken from elsewhere, or a manufactured conduit) bridges the gap.
The fibers beyond the cut die back. Nothing below the repair works again until new fibers grow all the way down from the stitch line. That’s the whole wait.
A cut nerve is usually picked up on the day: numbness down one side of a finger after a cut is a nerve until proven otherwise. See cuts and stitches to the hand. Tendons often get cut in the same injury. See flexor tendon repair recovery.
How long does nerve repair take to heal?
Your surgeon may give you different dates. Use theirs.
- Weeks 0 to 4 (protect): the repair is protected in a splint that stops the joints stretching the stitched nerve, often with the wrist or finger held slightly bent. Every joint that isn’t restricted is moved daily. If a flexor tendon was repaired too, you follow the tendon protocol, usually around 6 weeks in a dorsal blocking splint.
- Weeks 4 to 8 (restore movement): splint gradually weaned, full movement restored, scar work, gentle nerve gliding.
- Months 2 to 12 (the waiting period): Tinel’s sign tracked monthly, sensory re-education started the moment there’s anything to work with, joints and muscles kept supple.
- Months 12 to 24 (the final picture): judge the result here. A nerve at the wrist has further to travel than one in a finger, so it sits at the longer end.
The sign you can track at home
This is the single most useful thing to know, because it turns an invisible process into something you can watch.
Tap gently along the path of the nerve, starting below the scar and working towards the fingertip. At the point the regrowing fibers have reached, tapping produces a distinct electric tingle into the finger.
Mark that spot.
Check again in a month.
If the tingling point has moved a couple of centimeters further down the finger, the nerve is growing. That’s Tinel’s sign, and following it monthly tells you more about your progress than anything else available to you.
A tingling point that’s advancing means it’s working. A tingling point that hasn’t moved in three months means someone should look again.
When does feeling come back after nerve repair?
Sensation doesn’t return as a single switch. It arrives in a sequence, and the early stages feel unpleasant and wrong, which is normal.
- Pain and temperature first. Often unpleasantly sharp and poorly located.
- Then moving touch and vibration. You’ll feel something being dragged across the skin before you can feel it resting there.
- Then constant touch.
- Last, discrimination: telling two points apart, judging textures, recognizing an object by feel without looking.
Along the way, sensation is frequently misreported.
Touching one spot feels like a different spot, or feels electric, or feels far too intense. The fibers have grown back but not necessarily to their original addresses, and your brain has to relearn the new map. (Think of it as the nerve’s version of moving house and the mail still going to the old address.)
Sensory re-education exercises after nerve repair
This is the part of nerve recovery that people don’t know exists, and it’s the difference between a hand that feels and a hand that has sensation but can’t use it.
- Early phase, once you can feel moving touch. Stroke the area with a fingertip while watching, then repeat with your eyes closed, then look again to confirm. 5 to 10 minutes, 3 to 4 times a day. You’re teaching your brain to match the new signal to the right place.
- Later phase, once you can feel constant touch. Identify textures and everyday objects by feel with your eyes closed, then check. Coins, keys, fabric, rice, buttons. Same dose: 5 to 10 minutes, 3 to 4 times a day.
- Desensitization, if the skin is over-sensitive. Rub the area with textures from soft to rough (cotton wool, a towel, then velcro), 2 to 3 minutes each, several times a day. Move up a texture when the current one stops bothering you.
- Tendon glides and joint movement once the splint allows: a full fist and a full straighten, 10 reps, 4 to 6 times a day, so the hand is ready when the feeling arrives.
It’s tedious and it works, and the people who do it end up using the hand normally rather than protecting it.
The nerve regrows on its own. Learning to use what it brings back takes practice.
Protecting a hand that can’t feel
While the area is numb, it will burn and cut without warning you.
That’s not a small risk, it’s a routine one.
- Look, daily. Check the numb area for cuts, blisters and redness you didn’t feel happen.
- Water. Test the temperature with the other hand. Always.
- Heat. Be deliberate around hot pans, kettles, cigarettes, radiators and engines.
- Pressure. Watch for marks from tools and grips. Gloves for work and gardening.
When can I work, drive and use the hand after nerve repair?
Typical ranges for a nerve repair in the finger or hand. Your surgeon’s protocol wins every time, and a repair that included a tendon follows the slower tendon timeline.
- Desk work: often within 1 to 2 weeks, typing one-handed or around the splint if comfortable.
- Light use of the hand: after the splint comes off, usually 4 to 6 weeks.
- Driving: once you’re out of the splint and can grip the wheel well enough to control the car in an emergency.
- Heavy gripping and manual work: usually around 10 to 12 weeks, with gloves while the skin is numb. See returning to work after a hand injury.
What decides how much comes back?
Three things that genuinely change the outcome, none of which are effort-related:
- Your age. Children recover far better than adults, and results decline steadily with age.
- How clean the injury was. A sharp cut repairs better than a crush.
- Whether a graft was needed. A graft means two junctions to cross instead of one.
The realistic goal for most adults is protective sensation: enough to know when something is hot, sharp or pressing. Fine discrimination is a bonus rather than an expectation. And cold intolerance, an aching, unpleasant response to cold weather, is close to universal and is usually the complaint that lasts longest.
The window for the muscles
Feeling can keep improving for years. Muscles are less patient.
In Closing Window terms, a muscle waiting for its nerve sits in a closing window. If the regrowing fibers take too long to arrive, roughly beyond 12 to 18 months, the muscle may no longer accept them when they get there. That’s why repairs higher up the arm, with further to travel, are watched closely for motor recovery.
- While you wait: a splint keeps the hand usable and stops the joints stiffening, such as an anti-claw splint for ulnar nerve weakness or a wrist drop splint for the radial nerve.
- If the muscle doesn’t come back: a tendon transfer can borrow a working muscle to do the job. The window changes the goal, not the effort.
Call your surgeon today if
- Increasing redness, heat, throbbing, discharge from the wound, or a fever.
- A sudden change after a fall, a jolt or a hard grip in the first weeks, with new pain or a loss of feeling that had started returning. The repair may have pulled apart.
- The splint is rubbing a sore or blister on numb skin you can’t feel.
- Pain escalating rather than settling after the first two weeks, with a shiny, swollen, very sensitive hand.
Get it checked if
- The tingling point hasn’t moved in three months.
- A small, exquisitely tender lump at the scar that shoots electric pain when tapped.
- Burns, cuts or blisters on the numb area that keep happening or aren’t healing.
- Joints stiffening while you wait for the nerve.
- Muscle wasting that’s getting worse rather than holding steady.
The stitching took a couple of hours. Teaching the hand to feel again takes a year or two.
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. Follow your own surgeon’s protocol where it differs from anything here.
Part of: Recovery after hand, wrist and elbow surgery: every week-by-week guide
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.