The Most Rule-Bound Rehab in Hand Therapy, and Why Every Rule Exists
A cut across the palm side of your finger or wrist can divide the tendons that bend your fingers. They get repaired with stitches finer than thread, and then you spend three months in a protocol that will feel absurdly over-cautious.
It isn’t over-cautious. It’s built between two specific failures, and there’s very little room between them.
Move it too little and the tendon glues itself to the sheath around it. Move it too hard and the repair pulls apart.
One of those gives you a stiff finger that needs another operation. The other gives you a finger that stops working, weeks after you thought you were past the worst.
What’s actually happening in there
Your flexor tendons don’t run loose through the finger.
They run inside a narrow sheath, held tight against the bone by a series of pulleys, gliding through it like a cable through a housing. That tight fit is what makes your fingers precise.
It’s also the whole problem after a repair.
A repaired tendon has a bulge of suture and swollen tissue at the repair site, sitting inside a tunnel that had no spare room to begin with.
Healing tissue is sticky.
If that repair sits still, it bonds to the sheath wall, and a tendon bonded to its housing cannot glide…so the finger won’t bend even though the tendon is perfectly intact.
The zone between the palm crease and the middle of the finger is where this is hardest. Surgeons have called it no man’s land for decades, because both tendons run together through the tightest part of the sheath there and the results have always been the least forgiving.
Meanwhile the repair itself is not strong. It’s stitches holding two cut ends together, and for the first weeks the stitches are doing nearly all the work.
The week 3 trap
Here’s the thing nobody feels coming.
In the first weeks, the body softens the tissue at the repair site before it starts rebuilding it. The tendon ends actually get weaker before they get stronger. The low point lands somewhere around week 2 to 3.
Which is exactly when the swelling has settled, the wound looks healed, the pain has faded, and the hand feels basically fine.
The repair is at its weakest on the day it first feels strong.
Ruptures don’t usually happen doing something reckless. They happen catching a falling object, pulling a door, pushing up off a chair…one reflex, before the thought arrives.
A rupture means going back to theatre, and a re-repair does worse than the first one did.
What treatment actually looks like
Hand therapy starts within the first few days. Not weeks. This is one of the few post-surgical hands where waiting for the first appointment costs you range you don’t get back.
You’ll be fitted with a splint that runs along the back of your hand and forearm, holding the wrist and big knuckles bent and the finger joints straight. That position keeps slack in the repaired tendon so nothing pulls on it, whatever your hand does inside the splint.
Inside that splint, you’ll be given movement to do. Which movement depends on your surgeon’s protocol and how the repair was done…some use passive bending with the other hand, some use very light active holding, and stronger modern repairs allow more early activity than older ones did.
(This is why I won’t give you an exercise program here. The right one depends on how many strands of suture are holding your tendon together, and only your surgeon and treating hand therapist would know that.)
What is universal, and what I’d tattoo on people if I could:
- The splint does not come off. Not to wash, not to sleep, not to show someone, not for a second.
- Nothing gets gripped, lifted, carried or pulled with that hand. A mug counts. A kettle counts. A seatbelt counts.
- You do not test it. Not once. “Just seeing if it works yet” is a genuine cause of rupture.
- You do the exercises you were given, at the frequency you were given. Missing days is how adhesions form.
What recovery feels like, week by week
- Days 0 to 5: splint fitted, therapy begins, swelling and elevation are the focus. Everything feels fragile because it is.
- Weeks 1 to 3: the controlled movement programme. Hand feels increasingly normal, repair gets structurally weaker. Highest-risk fortnight of the whole recovery.
- Weeks 4 to 6: progression to more active bending, splint often modified. Scar work starts once the wound is sound.
- Weeks 6 to 8: splint usually discontinued. Light functional use returns. Still no gripping or resistance.
- Weeks 8 to 12: strengthening finally begins, gradually.
- Months 3 to 6: full use, heavy work, sport. Grip strength continues climbing across the whole period.
Honest expectation: a lot of people don’t get back to a completely full fist. Some permanent tightness, particularly at the fingertip joint, is common even after a technically perfect repair and perfect rehab. If your finger is stiff at month 4 despite doing everything right, that isn’t a moral failure and it isn’t necessarily the end…a release operation for adhesions is a real option once the repair itself is solid.
The short version
Get to a hand therapist within days of the operation, not weeks. Keep the splint on. Grip nothing. Never test it. Do the exercises daily.
The rules are not caution. They’re the treatment, and they’re calibrated to a repair that gets weaker before it gets stronger, at exactly the moment your hand starts feeling fine.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Tens of 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 and therapist’s protocol over anything here, always.