A finger that won’t straighten fully after hand surgery is most often
- SWELLING,
- a tight scar, or
- a middle joint that has stiffened in a bend
Less often it’s a tendon that is stuck or lagging.
One simple test tells them apart – if you can push the finger straight with your other hand but can’t straighten it yourself, the problem is usually the TENDON. If it won’t go straight even when pushed, it’s the JOINT, skin or scar.
The first three months are the best window to treat it. Stiffness left longer than that is harder to reverse.
The push test
- Straighten the finger as far as you can on your own. Note where it stops
- Now gently push it straighter with the other hand, never forcing past discomfort
- Goes further when pushed: active lag. Think tendon adhesion, a weak or stretched extensor, or swelling limiting the pull
- Stops at the same point when pushed: passive stiffness. Think joint contracture, a tight scar or skin
If you can push it straight, the problem is the pull. If you can’t push it straight, the problem is the joint.
Common causes by operation
- Trigger finger release: the middle joint often stayed bent for months before surgery and stays stiff for weeks after
- Dupuytren’s surgery: scar contraction and the middle joint drifting back into a bend in the first three months
- Extensor tendon repair: an extensor lag, where the repaired tendon has healed slightly long or stuck
- Flexor tendon repair: adhesions stopping the tendon gliding, plus a middle joint that stiffened in the protective splint
- Finger fracture fixation: joint stiffness and tendon adhesion over the plate or pins. See broken finger
- Any hand surgery: swelling that isn’t controlled early. See swelling after a hand injury
What helps
- Control swelling first. Elevation, gentle fists and light compression. A swollen finger won’t straighten
- Frequent, gentle straightening, little and often through the day, once your surgeon allows
- Scar massage to free a tethered scar. See scar management
- Splinting when exercises alone aren’t enough:
- PIP extension splint at night to hold what you gain
- Capener splint during the day for a springy, bent middle joint
- Serial casting for a stubborn joint
- Night extension splint after Dupuytren’s surgery
- Keep the fist. Gaining straightening at the cost of bending isn’t progress. Both get measured
A typical pattern for a stiff middle joint
- Weeks 0 to 2: swelling control, gentle movement as your surgeon allows
- Weeks 2 to 6: scar massage, straightening exercises, night splint if the joint is losing ground
- Weeks 6 to 12: daytime Capener splint or serial casting if progress stalls
- After 3 months: gains slow down. A joint that hasn’t changed may need a surgical opinion
Get it checked if
- The finger suddenly stops straightening after it had been improving, especially after a pop: possible tendon rupture
- The finger crosses its neighbor when you make a fist
- Swelling, redness or warmth around the wound. See wound healing or infection
- Burning pain, color change and skin too sensitive to touch. See CRPS
- No improvement after six weeks of consistent exercises
For the opposite problem, see can’t make a fist, and finger joint anatomy for why the middle joint stiffens so easily.
Push test first, swelling second, splint third, and get it done in the first three months.
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.