What Is Jersey Finger?
Jersey finger is a serious hand injury defined as an avulsion of the flexor digitorum profundus (FDP) tendon from its insertion at the distal phalanx. This tendon is responsible for flexing the fingertip at the distal interphalangeal (DIP) joint.
The injury commonly occurs when a flexed finger is suddenly forced into extension—classically when an athlete grabs an opponent’s jersey and the finger is pulled away.
Why Is It Called “Jersey Finger”?
The term originates from contact sports such as football or rugby, where players frequently grab jerseys. When the opponent pulls away, the finger is forcibly extended while actively flexing, leading to tendon rupture.
See Also: Hand Anatomy: Bones & Muscles
Epidemiology and Risk Factors
- Most common closed flexor tendon injury of the hand
- Frequently seen in young athletes, especially in contact sports
- The ring finger is affected in up to 75% of cases due to its biomechanical position during grip
Mechanism of Injury
Jersey finger occurs when:
- The finger is actively flexed
- A sudden force causes hyperextension at the DIP joint
This leads to failure at the tendon’s weakest point—its insertion at the distal phalanx.
See Also: Hand Flexor Tendon Injury
Clinical Presentation
Key Symptoms
- Sudden pain in the finger (typically volar side)
- Swelling and tenderness
- Weak grip strength
Classic Signs
- Inability to flex the DIP joint
- Finger rests in relative extension compared to others
- Possible palpable retracted tendon proximally
Classification of Jersey Finger
Jersey finger is classified based on tendon retraction and associated injury:
- Type I: Tendon retracts into palm (most severe)
- Type II: Retracted to proximal interphalangeal joint
- Type III: Avulsion with bony fragment
- Type IV: Tendon avulsion plus fracture from fragment
Diagnosis
Clinical Diagnosis
Primarily based on physical examination:
- Inability to flex DIP joint is diagnostic
Imaging
- X-rays: Detect bony avulsion fragments
- Ultrasound: Assess tendon position
- MRI: Occasionally used for detailed evaluation
Jersey Finger Treatment
1. Surgical Treatment (Gold Standard)
- Early surgery (within 2–3 weeks) is strongly recommended
- Techniques include:
- Tendon reinsertion using suture anchors
- Open reduction if fracture present
Early intervention leads to excellent functional outcomes.
2. Delayed or Chronic Cases
- Tendon grafting (two-stage reconstruction)
- DIP joint arthrodesis (in severe stiffness)
Delayed cases are more complex due to tendon retraction and scarring.
3. Conservative Treatment (Rare)
Non-surgical Jersey Finger treatment is rarely indicated and usually reserved for:
- Patients unfit for surgery
Some case reports show acceptable outcomes, but this is not standard care.
Rehabilitation
Postoperative rehabilitation is essential:
- Controlled mobilization to prevent stiffness
- Avoid excessive force to prevent tendon rupture
- Gradual return to activity
Return to sports typically occurs within 8–12 weeks if recovery is successful.
Complications
- Loss of DIP joint flexion
- Reduced grip strength
- Tendon adhesions or rupture
- Quadriga effect (reduced flexion in adjacent fingers)
Prognosis
- Early diagnosis and treatment → excellent outcomes
- Delayed treatment → poorer function and complex surgery
Surgery within 10 days is associated with the best results.
Differential Diagnosis
Jersey finger is often mistaken for:
- Mallet finger
- Finger sprain
- Distal phalanx fracture
Jersey Finger vs Mallet Finger
| Feature | Jersey Finger | Mallet Finger |
|---|---|---|
| Tendon injured | FDP (flexor) | Extensor tendon |
| DIP position | Extended (cannot flex) | Flexed (cannot extend) |
| Treatment | Surgical | Often conservative |
Key Takeaways
- Jersey finger is a flexor tendon avulsion injury requiring urgent attention
- Inability to flex the fingertip is the hallmark sign
- Early surgical repair is critical for optimal recovery
- Delayed diagnosis leads to permanent functional impairment
References & More
- Abrego MO, Shamrock AG. Jersey Finger. [Updated 2023 Aug 7]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: Pubmed
- Zemirline A, Asmar G, Liverneaux PA. Conservative treatment in Jersey finger: a case report. J Plast Reconstr Aesthet Surg. 2013 Nov;66(11):1616-8. doi: 10.1016/j.bjps.2013.03.026. Epub 2013 Apr 19. PMID: 23602271. Pubmed
- Tempelaere C, Brun M, Doursounian L, Feron JM. Traumatic avulsion of the flexor digitorum profundus tendon. Jersey finger, a 29 cases report. Hand Surg Rehabil. 2017 Oct;36(5):368-372. doi: 10.1016/j.hansur.2017.06.002. Epub 2017 Jul 8. PMID: 28694076. Pubmed
- Egol KA. Handbook of fractures. 6th ed. Philadelphia: Lippincott Williams & Wilkins; 2019.
