After thumb UCL (ulnar collateral ligament) repair, the thumb is protected in a splint or cast for around four to six weeks.
Gentle movement follows, and pinch strength builds from about eight weeks. Most people return to full grip and sport at around three months.
The repair reattaches the torn ligament on the INNER side of the thumb knuckle, the side that stops the thumb bending away from your index finger.
The movement to protect is that sideways stress:
- pinching hard,
- opening jars, and
- anything that levers the thumb outward
Why this ligament needs surgery
- Partial tears usually heal in a thumb splint without surgery. See skier’s thumb
- Complete tears often can’t heal on their own, because the torn end flips and gets trapped behind a layer of muscle tendon. It can’t reach the bone to reattach
- Timing matters. Repairs are most straightforward within the first few weeks. Later, the ligament may need reconstructing with a tendon graft, which means a longer recovery
- The repair usually anchors the ligament back to the bone with a small anchor, sometimes reinforced with a strong tape
A thumb that wobbles when you pinch a key isn’t a sprain to wait out. It’s a ligament that may not be able to find its way home.
Recovery week by week
- Weeks 0 to 2: post-operative splint or cast. Hand raised. Fingers moving freely
- Weeks 2 to 6: custom thumb spica splint, worn nearly full time. Gentle thumb movement out of the splint from around three to four weeks if your surgeon allows. No pinching against resistance
- Weeks 6 to 8: splint weaned for light tasks, kept for heavier ones and at night if advised. Range of movement exercises
- Weeks 8 to 12: pinch and grip strengthening. Jar lids and keys return gradually
- Around 3 months: sport and heavy work, often with a protective splint or taping for contact and ball sports
Repairs reinforced with tape sometimes move earlier. Reconstructions usually take longer. Your surgeon sets your dates.
What’s normal
- A stiff thumb knuckle after weeks in a splint, improving over months
- A tender, firm scar on the inner side of the knuckle
- Weak pinch until at least three months
- Mild aching after heavy use for the first six months
What to watch for
- Numbness along the inner edge of the thumb: a small skin nerve runs close to the repair. Often temporary
- The thumb feeling loose again when you pinch, especially after a fall or a jolt
- Wound problems. See wound healing or infection
- Stiffness that isn’t improving after the splint comes off
What helps
- Wear the splint as instructed. The repair is weakest in the first six weeks
- Avoid forceful pinch on small objects like keys, coins and packaging in the early months. Wider grips on bigger objects load the ligament less
- Thicker handles, jar openers and key turners for the first few months
- Scar massage once the wound has closed. See scar management
- For sport, see playing splints and casts
Contact your surgeon if
- The thumb feels unstable again, or you had a fall onto it
- The wound is red, hot, swollen or weeping
- Numbness isn’t improving after six weeks
- Pain is increasing instead of settling
For the injuries that cause it, see skiing and snowboarding and dog walking injuries. For the practical side, see life with one hand after surgery.
Protect the pinch for six weeks, rebuild it for six more.
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.