Jersey finger happens when a finger is forcibly extended while gripping — pulling the flexor tendon off the bone at the fingertip. The result: you cannot bend the end joint of the finger. This is a surgical emergency. The tendon retracts further every day — repair must happen before it is out of reach.
This injury is frequently missed or misdiagnosed as a sprain. If your finger won't bend at the tip after a gripping injury, treat it as a jersey finger until proven otherwise.
Understanding the Injury
Jersey finger is an avulsion of the flexor digitorum profundus (FDP) tendon from its insertion at the base of the distal phalanx — the terminal bone of the finger. It is a Zone 1 flexor tendon injury, occurring distal to the insertion of the flexor digitorum superficialis (FDS). The ring finger is most commonly affected, though any finger can sustain this injury.
The injury occurs when the finger is forcibly extended while actively gripping under load. The classic scenario is a football or rugby player grabbing an opponent's jersey during a tackle — the jersey pulls the finger into extension while the player is gripping it, generating more force on the FDP tendon than it can withstand. The tendon avulses from the bone, sometimes pulling a bony fragment with it.
The result is simple and definitive: the player cannot actively flex the DIP joint. The fingertip hangs loose. PIP motion remains intact because the FDS is still functioning. Patients often describe the injury as "just a sprain" — the finger is not dramatically deformed, there may be minimal swelling, and the pain is often less than expected. This is why jersey finger is so frequently missed in the first hours after injury.
In Dr. Graham's experience, delayed presentation is the most common problem with this injury. Patients present days or weeks after the injury, having been told it was a sprain. By that point, the tendon has retracted proximally — sometimes into the palm, sometimes all the way to the wrist — and what could have been a straightforward repair has become a complex reconstruction problem.
The FDP (red dashed) avulses from the distal phalanx and retracts proximally. The FDS (green) remains intact at the middle phalanx — PIP flexion is preserved. Only DIP active flexion is lost.
The critical variable is how far the tendon has retracted. The further it travels — into the palm or wrist — the more complex the repair, and the worse the outcome.
The FDP tendon does not wait. Once avulsed, it begins retracting proximally — pulled by its own elasticity and the unresisted pull of the flexor muscle. Every day without repair is a day the tendon moves further from where it needs to go. A tendon at the fingertip today may be in the palm next week and at the wrist the week after that.
Tendon accessible at or near its insertion. Straightforward repair to the distal phalanx. Best outcomes. Repair now.
Tendon has begun to retract. Repair still usually possible but requires more extensive exposure. Outcomes remain good with prompt action.
Tendon significantly retracted, often into the palm. Repair feasible but technically challenging. Risk of pulley injury during retrieval increases.
Primary repair often not possible. Staged tendon reconstruction or DIP fusion may be the only options. Outcomes are significantly less predictable.
Common Source of Confusion
Both injuries cause a drooping fingertip that won't straighten or flex properly. They are opposite injuries — different tendons, different mechanisms, different treatments — but they present similarly enough that one is frequently mistaken for the other.
Surgical Repair
Jersey finger repair requires retrieving the retracted FDP tendon and securing it back to its footprint at the distal phalanx. The technique depends on what Dr. Graham finds intraoperatively — specifically, whether there is a bony fragment attached to the tendon and the quality of the tissue at the repair site.
For purely soft tissue avulsions, the tendon is repaired directly to the distal phalanx using a suture anchor — a small titanium implant that provides secure fixation to the bone without the need for pull-through sutures through the nail. For avulsions with a bony fragment of meaningful size, the fragment is reduced and fixed to restore the articular surface of the DIP joint alongside the tendon repair.
The surgery is performed under regional anesthesia as an outpatient. The earlier the repair, the simpler the procedure — a tendon at the fingertip requires only a small incision and a straightforward retrieval. A tendon in the palm requires more extensive exposure and risks injury to the pulley system during passage back through the flexor sheath.
A freshly avulsed FDP tendon is elastic, well-vascularized, and sits close to where it needs to go. Retrieving it is simple. A retracted tendon that has been sitting in the palm for three weeks is scarred, foreshortened, and difficult to advance back through the intact pulley system without damaging the pulleys or the tendon itself. The repair Dr. Graham performs on day 5 is completely different from the one he performs on day 30 — and so is the outcome.
Regional block — digital, wrist, or more proximal depending on how far the tendon has retracted. Outpatient procedure at Baptist Beaches Hospital or Horizon Surgery Center.
The finger is opened using a Bruner zigzag incision. The retracted FDP tendon is located — at the fingertip, in the mid-finger, or in the palm depending on timing — and carefully retrieved back through the flexor sheath without disturbing the pulleys.
The tendon end and any avulsed bony fragment are assessed intraoperatively. Fragment size, tissue quality, and tendon length determine the specific fixation method used.
The FDP is repaired to its anatomic footprint. Soft tissue avulsions: suture anchor fixation into the distal phalanx. Bony avulsions: fragment reduction and fixation with wire or mini-screw as appropriate.
Wound closure and dorsal blocking splint applied — holds the wrist and MCP in flexion to reduce tension on the repair. Controlled active motion begins 3 to 5 days post-operatively under hand therapist supervision.
Recovery
Flexor tendon repairs are uniquely rehabilitation-dependent. Moving too early risks rupture. Moving too late risks adhesions. The controlled active motion protocol threads that needle.
Dorsal blocking splint in place. Elevation to minimize swelling. No active motion yet — the repair is in its most vulnerable window.
Hand therapy begins with a controlled active motion protocol — specific, supervised exercises that move the repaired tendon through the sheath to prevent adhesions while protecting the repair from excessive load.
Splint gradually discontinued. Active range of motion progresses. Light resistive exercises introduced as repair strength confirms on clinical exam.
Most patients return to full activity including contact sports between 3 and 4 months. Full DIP flexion and grip strength return in most cases with a timely repair and compliant therapy.
Flexor tendon repair is one of the most rehabilitation-dependent procedures in hand surgery. The outcome of the surgery is heavily influenced by the quality of the post-operative therapy protocol. Dr. Graham works closely with experienced hand therapists at JOI whose familiarity with flexor tendon protocols is a meaningful part of why his patients achieve good outcomes. Starting motion at the right time, in the right amount, with the right protection — this is where the surgery either succeeds or forms adhesions that limit motion for years.
"He called me multiple times after surgery to check on my recovery personally. My finger heals well and I got full motion back. You can tell Dr. Graham genuinely cares about what happens to you after you leave the OR."
Common Questions
What patients and families ask most often — often late at night after a game.