What is the appropriate treatment for an avulsion fracture of the proximal phalanx, and is buddy taping indicated?

Treatment of Avulsion Fracture of Proximal Phalanx

Buddy taping with immediate mobilization is the appropriate treatment for most avulsion fractures of the proximal phalanx, provided the fracture involves less than one-third of the articular surface, has no palmar displacement >3mm interfragmentary gap, and demonstrates stability on clinical examination.

Treatment Algorithm

Step 1: Obtain Proper Imaging

• Get a 3-view radiographic examination (PA, lateral, and oblique views) to adequately visualize phalangeal fractures 1
• Standard 2-view imaging is insufficient and misses fractures

Step 2: Assess Fracture Characteristics

Indications for OPERATIVE fixation 1:

• Articular involvement >1/3 of joint surface
• Palmar displacement of the distal fragment
• Interfragmentary gap >3 mm
• Unstable fracture after closed reduction
• Clinical malrotation
• Coronal angulation >10° that persists after reduction

Indications for CONSERVATIVE management (buddy taping):

• Articular involvement ≤1/3 of surface
• Stable fracture pattern
• No significant displacement after reduction
• No malrotation

Step 3: Conservative Treatment Protocol

For fractures meeting conservative criteria:

1. Perform closed reduction if displaced (can use local anesthetic and manipulation) 2

2. Apply buddy taping to adjacent digit 3

   • Tape the injured finger to the neighboring digit
   • This provides dynamic support while allowing motion

3. Begin immediate mobilization 3

   • No rigid splinting required for stable fractures
   • Early motion prevents stiffness, the primary complication of phalangeal fractures

4. Follow-up at 1 week to assess for secondary displacement 2

   • If displacement occurs, consider repeat closed reduction with continued conservative management
   • Conversion to surgery is not automatic even with loss of reduction

Evidence Supporting Buddy Taping

The most relevant study specifically addressing proximal phalanx base fractures demonstrated 89% excellent-to-good results with buddy taping and immediate mobilization 3. In this prospective series of 53 patients:

• All but one patient regained full flexion
• Only 2 patients had extension deficits
• High patient satisfaction
• No nonunions or delayed unions
• Only 3 cases of malrotation (none requiring surgery)

Recent pediatric data further supports this approach, showing buddy taping is non-inferior to splinting even after reduction of displaced fractures, with significantly better patient comfort 4.

Critical Pitfalls to Avoid

1. Over-immobilization: Rigid splinting leads to decreased finger mobility despite anatomic reduction. Function should be prioritized over perfect radiographic alignment for non-articular or minimally displaced fractures 3

2. Missing operative indications: The ACR guidelines specifically note that avulsion fractures with >1/3 articular involvement or >3mm gap require surgical fixation to prevent long-term complications 1

3. Inadequate initial imaging: Two views are insufficient—obtain three views including oblique projections 1

4. Assuming all displacement requires surgery: Even fractures that lose reduction after initial treatment can be successfully managed with repeat closed reduction and continued buddy taping 2

Special Considerations

• Thumb avulsion fractures have different criteria: stability on lateral stress testing is the key determinant, not displacement 5
• Fifth digit fractures respond particularly well to buddy taping with the fourth digit 3
• Recent multi-center data shows significant practice variation in immobilization approaches, with trend toward functional treatment (72-94% for avulsion fractures) 6