Jersey Finger

Jersey finger is an avulsion of the flexor digitorum profundus (FDP) tendon from its insertion on the volar base of the distal phalanx. It is a commonly missed injury in the ED that requires urgent surgical referral — ideally within 7–10 days — as delayed diagnosis significantly worsens outcomes. [1-3]

1. History

• Mechanism: Forceful extension of the DIP joint while the finger is actively flexed — classically from grabbing an opponent's jersey in football or rugby [1][4-5]
• Ask about the specific activity at time of injury (tackling, gripping, catching)
• Timing of injury — critical for surgical planning (Type I injuries require repair within ~10 days) [2]
• Which finger — the ring finger is most commonly affected (~75% of cases) [1]
• Ability to bend the fingertip since injury
• Pain location — typically volar-sided along the finger or palm (may indicate level of tendon retraction) [1]
• Dominant hand involvement and occupational demands
• Prior hand injuries or surgeries

2. Alarm Features

• Inability to actively flex the DIP joint — this alone warrants expedited referral regardless of radiographic findings [1]
• Swelling and tenderness tracking proximally along the tendon sheath into the palm (suggests Type I retraction to the palm)
• Presentation >7–10 days after injury — surgical window narrows significantly [2]
• Open wound over the volar finger (open jersey finger)
• Neurovascular compromise distally

3. Medications

• Acute pain management: NSAIDs (ibuprofen 400–600 mg PO q6–8h) or acetaminophen
• Opioids rarely needed; short course if severe
• Fluoroquinolones — associated with tendon rupture; document if patient is on these at time of injury
• Corticosteroids (systemic) — chronic use weakens tendons and may predispose to avulsion
• Post-operative: pain management per hand surgery protocol; antibiotics if open injury

4. Diet

• No specific dietary triggers or management
• Adequate protein intake supports tendon healing post-operatively
• Smoking cessation is critical — nicotine impairs tendon healing and microvascular perfusion

5. Review of Systems

• Hand dominance and functional demands
• Numbness or tingling in the affected finger (digital nerve injury)
• History of inflammatory arthritis, connective tissue disorders, or systemic conditions affecting tendons
• Other joint complaints suggesting polyarticular process
• Constitutional symptoms (fever, weight loss) — if concern for atypical etiology

6. Collateral History and Family History

• Witnesses to the mechanism (coaches, athletic trainers) — helpful to confirm forced extension mechanism
• Prior "jammed finger" or "sprain" diagnoses that were never fully evaluated (commonly misdiagnosed initially) [3][6]
• Family history of connective tissue disorders (Ehlers-Danlos, Marfan) — may predispose to tendon avulsion
• Occupational history — manual laborers, musicians at higher functional risk

7. Risk Factors

• Contact sports: football, rugby, basketball, wrestling [4-5]
• Young, active males (peak incidence ages 20–29) [7]
• Ring finger involvement (biomechanically weakest FDP insertion) [1]
• Chronic fluoroquinolone or corticosteroid use
• Connective tissue disorders
• Prior tendon injuries

8. Differential Diagnosis

• Mallet finger (extensor tendon avulsion) — loss of DIP extension, not flexion; DIP rests in flexion rather than extension [1]
• Distal phalanx fracture (non-avulsion) — may have intact DIP flexion; crush mechanism rather than forced extension [1]
• FDP laceration — open wound present; similar loss of DIP flexion
• DIP joint dislocation — obvious deformity on exam and radiographs
• Trigger finger — locking/catching rather than complete loss of active flexion; no acute traumatic mechanism [8]
• Flexor tenosynovitis (Kanavel signs) — infectious etiology with fusiform swelling, pain with passive extension, flexed posture, tenderness along sheath
• Anterior interosseous syndrome — weakness of FDP to index/long and FPL; no traumatic mechanism; unable to make "OK" sign

9. Past Medical History

• Previous hand/finger injuries or surgeries
• Inflammatory arthritis (RA, psoriatic arthritis)
• Diabetes (impairs wound healing)
• Connective tissue disorders
• Chronic steroid use
• Smoking history
• Anticoagulation status (relevant for surgical planning)

10. Physical Exam

• Inspection: Affected finger may rest in slight extension at the DIP joint compared to the normal cascade of progressive flexion [1]
• Swelling and ecchymosis: Volar aspect of the finger; palpate along the tendon sheath for a tender mass (retracted tendon stump) — location helps classify the injury type
• Active DIP flexion test: Stabilize the middle phalanx and ask the patient to flex the DIP joint — inability to flex = positive for FDP avulsion [1]
• FDS isolation test: Hold all other fingers in extension and ask patient to flex the affected finger at the PIP joint — should be intact (FDS is not injured)
• Tenodesis effect: Passive wrist extension should cause finger flexion — absent DIP flexion with wrist extension confirms FDP discontinuity
• Assess digital neurovascular status (capillary refill, two-point discrimination)
• Compare to contralateral hand

11. Lab Studies

• No routine labs required for isolated jersey finger
• Pre-operative labs per institutional protocol if surgery planned (CBC, BMP, coagulation studies)
• If concern for infection (open injury): CBC, CRP, ESR
• If atypical presentation or atraumatic: consider inflammatory markers, rheumatoid factor, uric acid

12. Imaging

• First-line: 3-view finger radiographs (AP, lateral, oblique) [1][9]
  • May show a volar avulsion fracture fragment at the base of the distal phalanx
  • Location of the fragment helps classify the injury (fragment at DIP = Type III; fragment at PIP = Type II)
  • Radiographs may be normal in pure tendon avulsions without bony fragment (Type I)
• Ultrasound: Cost-effective for preoperative planning; can identify the level of tendon retraction and confirm the diagnosis when radiographs are normal [4][10]
• MRI: Gold standard for soft tissue detail; useful in equivocal cases or delayed presentations to assess tendon retraction, sheath integrity, and viability
• Imaging should not delay referral if clinical exam is diagnostic [1]

13. Special Tests

Leddy and Packer Classification (modified) — guides surgical urgency and approach: [2][11]

• FDP isolation test (described above) — the single most important bedside test
• Point-of-care ultrasound can be performed in the ED to localize the retracted tendon

14. ECG

15. Assessment

Jersey finger is a closed tendon avulsion that is frequently misdiagnosed as a "jammed finger" or "sprain" in the ED. [3][6] The key clinical pearl is that any patient with loss of active DIP flexion after a forced extension mechanism requires urgent hand surgery referral, regardless of radiographic findings. [1] The ring finger is most commonly affected due to its relatively weaker FDP insertion and its position as the longest finger during grip. [1] Delayed diagnosis beyond 10–14 days significantly limits surgical options, as tendon retraction, myostatic contracture, and sheath obliteration may preclude primary repair. [2]

16. Treatment Plan

ED Management

• Splint the PIP and DIP joints in slight flexion (approximately 30°) using a dorsal aluminum splint [1]
• Ice, elevation, and analgesia
• Expedited referral to hand surgery — ideally within 24–48 hours for evaluation [1]

Surgical Management (definitive)

• All jersey finger injuries require surgical consultation; most types require operative repair [1][4]
• Type I: Primary tendon reinsertion (pull-out suture or suture anchor) — must be done within 7–10 days [2]
• Type II: Primary reinsertion — can be delayed up to several weeks but earlier is better [2]
• Type III: ORIF of the bony fragment [11][14]
• Delayed presentations (>3 weeks): Options include staged tendon reconstruction with silicone rod, tendon grafting, Z-plasty lengthening at the wrist, DIP arthrodesis, or no treatment depending on functional demands [2-3]
• Post-operative rehabilitation with a certified hand therapist is essential; early active mobilization protocols with volar plate augmentation have shown improved outcomes [15]

Recovery: 6–12 weeks; return to contact sports typically 8–12 weeks post-repair [1][4]

17. Disposition

• Discharge from the ED with splint and urgent hand surgery follow-up (within 24–72 hours)
• Admission is not typically required unless open injury with contamination, vascular compromise, or polytrauma
• Specialist consultation triggers: All confirmed or suspected jersey finger injuries require hand surgery referral [1]
• If hand surgery is not available locally, arrange transfer or telemedicine consultation urgently

18. Follow Up / Return Precautions

• Follow-up: Hand surgery within 24–72 hours of ED visit; do not delay beyond 7–10 days from injury [1-2]
• Return precautions — instruct patients to return immediately for:
  • Increasing pain, swelling, or signs of infection
  • Numbness or color change in the fingertip
  • Worsening inability to move the finger
• Patient counseling:
  • This is not a sprain — emphasize that without surgery, permanent loss of fingertip flexion is expected
  • Keep the splint on at all times until seen by hand surgery
  • Avoid any attempts to forcefully flex or extend the finger
• Expected recovery: Full recovery with surgery takes 3–6 months with hand therapy; return to sport at 8–12 weeks; complications include flexion contracture and re-rupture [1][4]

References

1. Common Finger Fractures and Dislocations. — Childress MA, Olivas J, Crutchfield A. American Family Physician. 2022.

2. Tendon Avulsion Injuries of the Distal Phalanx. — Tuttle HG, Olvey SP, Stern PJ. Clinical Orthopaedics and Related Research. 2006.

3. Z-Plasty Lengthening of the Flexor Digitorum Profundus at the Wrist (Zone 5) for the Treatment of Jersey Finger: Anatomical Study and Evaluation of Advancement Obtained. — Chanel L, Grolleau JL, Lauwers F, André A. Journal of Plastic, Reconstructive & Aesthetic Surgery : JPRAS. 2014.

4. A Review of Mallet Finger and Jersey Finger Injuries in the Athlete. — Bachoura A, Ferikes AJ, Lubahn JD. Current Reviews in Musculoskeletal Medicine. 2017.

5. An Investigation of Tendon Strains in Jersey Finger Injury Load Cases Using a Finite Element Neuromuscular Human Body Model. — Nölle LV, Alfaro EH, Martynenko OV, Schmitt S. Frontiers in Bioengineering and Biotechnology. 2023.

6. Evaluation and Treatment of Jersey Finger and Pulley Injuries in Athletes. — Freilich AM. Clinics in Sports Medicine. 2015.

7. Rehabilitation Following Surgery for Flexor Tendon Injuries of the Hand. — Peters SE, Jha B, Ross M. The Cochrane Database of Systematic Reviews. 2021.

8. Common Hand Conditions: A Review. — Currie KB, Tadisina KK, Mackinnon SE. The Journal of the American Medical Association. 2022.

9. ACR Appropriateness Criteria Acute Hand and Wrist Trauma. — Expert Panel on Musculoskeletal Imaging:, Torabi M, Lenchik L, et al.' Journal of the American College of Radiology : JACR. 2019.

10. Case 247: Jersey Finger of the Fifth Finger. — Créteur VM, Durieux PF, Cuylits N. Radiology. 2017.

11. Buttress Plating for Type 3-4-5 Jersey Finger Fractures: Without Bone Fragment Disruption and With a Challenging Rate of Hardware Removal-a Case Series. — Kümbüloğlu ÖF, Altuntas Y, Demirkale İ. B The Journal of Hand Surgery. 2025.

12. A Simultaneous Distal Phalanx Avulsion Fracture With Profundus Tendon Avulsion. A Case Report and Review of the Literature. — Ehlert KJ, Gould JS, Black KP. Clinical Orthopaedics and Related Research. 1992.

13. Characteristics and Therapy of Jersey Finger Type v Injuries at a Middle-European Level 1 Trauma Center-a Retrospective Data Analysis. — Hoppe PL, Frenzel S, Krusche-Mandl I, et al. Journal of Clinical Medicine. 2024.

14. Avulsion Fracture of the Flexor Digitorum Profundus Tendon ('Jersey Finger') Type III. — Shabat S, Sagiv P, Stern A, Nyska M. Archives of Orthopaedic and Trauma Surgery. 2002.

15. Repair of Flexor Digitorum Profundus Avulsions Including the Palmar Plate: A Retrospective Comparative Study of 56 Cases. — Fathy Sadek A, Azmy MM, Nady Saleh Elsaid A, Zein AMN, Yehya Hasan M. The Journal of Hand Surgery, European Volume. 2022.