Repair within about a week: expert advice and case seriesEmerging evidence
No trial has compared early and late repair. The advice comes from case series and experts. Leddy and Packer, in 36 athletes, found prompt diagnosis and repair within the first week gave the best results, and said a tendon that had pulled back into the palm should be repaired within 7 days. The AAOS says flexor tendon injuries are generally repaired within 7 to 10 days, and the sooner the better; a 2025 review says preferably within a week, and no later than 3 weeks.
In 7 rugby players, the 6 operated on within 10 days had a satisfactory result, and the one who came late needed a tendon-lengthening operation. In 32 French cases operated on 7 days after the injury on average, the authors credit quick diagnosis and surgery. For comparison, the UK standard for cut flexor tendons is a hand clinic, ideally within 24 hours, and surgery within 4 days. So the honest advice is: get it seen by a hand surgery team within days, not weeks.
Sources 2, 5, 6, 10, 12, 15
Not repairing it can be a reasonable choice for someMixed evidence
In a US series of 26 adults with injuries of the deep tendon near the fingertip, which may mix cut and torn-off tendons, the 11 not repaired had similar function scores and no complications. The 15 repaired had 4 fingers tear again, 4 wound breakdowns, 3 infections and 4 further operations. It's a small, weak study, but it supports not operating as a reasonable choice for some people, such as those found late or who don't need a strong fingertip grip. UK standards for cut flexor tendons list whether to repair one of a finger's two tendons, when the other still works, as a decision to share with you.
When a small piece of bone has come off but moved less than 2 mm, it can sometimes be splinted: in a series of 29, the 16 splinted had no loss of function at about 7 years, while most of the 13 operated on, whose fragments had moved further, lost some straightening at the end joint and about a quarter of their tip pinch strength. Your hand surgeon decides with you.
Sources 5, 15, 16, 17
Rehab after a repair: standard practice, very uncertain evidenceMixed evidence
Every UK leaflet we read starts protected exercises in a splint within days of the repair, and UK standards ask for weekly therapy for the first 6 weeks. The trials behind it are weak: a Cochrane review of 17 trials (1,108 people, mostly cut tendons in the middle of the finger) rated every comparison very low certainty, and no trial tested splint types, how long to wear the splint, or when to start strengthening.
Across 34 studies, early active movement had slightly more tears of the repair than passive movement (5% against 4%) but fewer stiff fingers (6% against 9%). In 356 repaired fingers, 4% tore again and 13% needed another operation, and older age, smoking, the little finger, more tissue damage and delay to surgery went with less movement. A review of 9 studies found too little evidence that fully active exercise beats gentler regimes. Most of this comes from cut tendons, not jersey finger, so it's borrowed evidence.
Sources 4, 15, 18, 19, 20, 21
Going back to sportEmerging evidence
NHS leaflets give sport at 10 to 12 weeks after the repair, and contact sport, heavy lifting and tight gripping from about 12 weeks, when the tendon is strong enough. A sports review gives 10 to 12 weeks for sports that need a grip and warns that going back sooner risks the tendon tearing again; in sports that don't need the hand, it says athletes may go back earlier in a protective fist-shaped cast. Another review expects 8 to 12 weeks out of most contact sports, and a third a full return within about 4 months. Your surgeon and hand therapist decide.
Sources 9, 12, 22, 23, 24, 25