Jersey Finger (FDP Avulsion in Zone I): Leddy and OBrien Classification
In short
Master jersey finger diagnosis and rehabilitation. Explore the Leddy and OBrien classification, surgical reattachment urgency, and staged hand therapy.
In this guide (4 sections)
Jersey finger, clinically classified as an avulsion injury of the flexor digitorum profundus (FDP) tendon at its insertion on the base of the distal phalanx, is the most common closed flexor tendon injury of the hand. The injury classically occurs during sports when an athlete forcibly grasps an opponents jersey or clothing while the opponent pulls away, subjecting the actively flexing distal interphalangeal (DIP) joint to sudden, violent passive hyperextension. Approximately 75 percent of jersey finger injuries involve the ring finger, owing to its anatomical vulnerability during power grip where the ring finger FDP shares a common muscle belly and projects furthest in the palmar cascade.
Traditional Kitchen Knife Trauma, Industrial Machine Injuries, and Fine Motor Dining Dexterity
In India, jersey finger occurs not only in contact sports like kabaddi, rugby, and football, but also during daily domestic and industrial activities. In rural and semi-urban settings, farmers grappling with livestock, handlers securing agitated cattle with ropes, or factory workers whose finger gets yanked backward by moving machinery experience identical FDP avulsion trauma. In traditional kabaddi matches, defenders lunging to tackle a raider by their jersey or waistband frequently sustain acute ring finger DIP hyperextension. Because the finger often exhibits minimal external swelling, patients frequently dismiss the injury as a minor sprain, seeking care weeks later when the inability to flex the fingertip prevents handling tools or eating rice.
Zone II No Mans Land Pulley Biomechanics, Tendon Healing Biology, and Adhesion Dynamics
The severity and surgical urgency of a jersey finger are dictated by the Leddy and OBrien classification system, which grades injuries based on the level of tendon retraction and the state of the vincula blood supply. In Type I injuries, the FDP tendon avulses completely, rupturing both the vinculum longum and breve, and retracts all the way into the palm at the level of the lumbrical origin. Deprived of synovial and vascular nutrition, the tendon end undergoes rapid necrosis and contracture within 7 to 10 days, mandating urgent surgical reinsertion within 7 to 10 days. In Type II injuries, the tendon retracts only to the level of the PIP joint, held by an intact vinculum longum. In Type III injuries, a large avulsion bone fragment catches at the A4 pulley, preventing proximal retraction.
Kleinert and Duran Splinting, Differential Gliding Drills, and Staged Active Motion
Surgical repair re-anchors the avulsed FDP tendon directly to the cancellous bone of the distal phalanx using pull-out transosseous sutures over a dorsal button or titanium suture anchors. Because bone-to-tendon healing requires 6 to 8 weeks to achieve structural integration, postoperative rehabilitation must be exceptionally protective. A dorsal blocking splint is worn continuously for 6 weeks, with controlled passive motion protocols initiated within the first week. Active DIP flexion is strictly forbidden until week 6, and resisted tip pinching is withheld until weeks 8 to 10 to prevent pulling the bone anchor out of the distal phalanx.
Protected DIP Joint Passive Flexion within Dorsal Splint
Objective: Maintain distal joint mobility and stimulate bone-tendon healing without active tensile strain
- 1Rest your operated arm on a table with your dorsal blocking splint securely in place.
- 2Use the thumb and index finger of your uninjured hand to gently support the middle phalanx of your operated ring finger.
- 3Gently use your healthy fingers to passively bend the tip joint (DIP) downward toward the palm.
- 4Hold the bent position for 3 seconds, ensuring the forearm muscles of your injured arm remain completely soft.
- 5Gently allow the fingertip to return to the resting position within the splint hood.
| Classification Type | Level of Tendon Retraction and Vascular Status | Surgical Urgency and Repair Strategy |
|---|---|---|
| Type I (Retraction into Palm) | Retracts to lumbrical origin in palm; vincula completely torn; blood supply destroyed | Surgical emergency; direct bone reinsertion mandatory within 7 to 10 days before necrosis |
| Type II (Retraction to PIP Joint) | Retracts to middle phalanx; vinculum longum intact; blood supply preserved | Direct reinsertion successful within 3 to 4 weeks; better tissue quality and prognosis |
| Type III (Bony Avulsion at A4 Pulley) | Large bony fragment trapped at A4 pulley; tendon cannot retract into palm | Open reduction and internal fixation (ORIF) of bone fragment; excellent healing potential |
| Type IV (Avulsion with Tendon Rupture) | Bone fragment avulsion paired with simultaneous tendon rupture off the fragment | Complex two-component repair: bone fixation plus tendon anchor re-attachment |
If you sustain a sudden popping sensation in your fingertip during sports or heavy manual work, test your tip joint immediately: hold the middle joint straight and try to actively bend the fingertip. Complete inability to bend the tip indicates an FDP avulsion requiring prompt surgical evaluation.
Frequently Asked Questions
Why is the ring finger injured most often in jersey finger?
When you close your fist, the ring finger fingertip extends deeper into the palm than the adjacent fingers, and its flexor tendon shares a common muscle belly with the little and middle fingers. When someone pulls away while you are gripping, the ring finger absorbs the brunt of the shock.
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