What type of splint should be used for a finger fracture?

Splinting for Finger Fractures

For most finger fractures, the specific splint type depends on the fracture location and pattern: buddy taping for stable middle/proximal phalanx fractures, distal interphalangeal (DIP) joint immobilization splints for distal phalanx fractures, and strict DIP extension splinting for mallet finger injuries.

Splinting by Fracture Location

Distal Phalanx Fractures

• Uncomplicated distal phalanx fractures (typically from crush injuries) require DIP joint splinting for 4-6 weeks 1
• The splint should immobilize only the DIP joint, allowing proximal interphalangeal (PIP) joint mobility to prevent stiffness

Mallet Finger (Dorsal Avulsion Fractures)

• Strict continuous splinting in full extension for 8 weeks is mandatory 1
• Both Stack splints and aluminum finger splints provide equivalent functional outcomes for acute Doyle type IVb bony mallet finger 2
  • Aluminum splints cost significantly less (approximately $0.03 vs $3.60) with no difference in union rates or extension lag 2
  • Modified dorsal finger splints (Kleinert design) maximize patient comfort while maintaining proper alignment 3
• Any interruption of continuous splinting resets the 8-week clock—this is a critical patient counseling point

Middle and Proximal Phalanx Fractures

• Buddy splinting is appropriate for stable fractures with minimal angulation (<10 degrees) 1
• Apply buddy tape to the adjacent uninjured finger with padding between digits
• Fractures with >10 degrees angulation, displacement, or malrotation require reduction or surgical referral 1
• Isometric traction splints can be considered for displaced proximal phalanx fractures, applied for approximately 5 weeks 4
  • Avoid traction splints in compression-type fractures—these can cause tenodesis effect with severe flexion deficits 4

Flexor Digitorum Profundus Avulsion (Jersey Finger)

• These volar base distal phalanx avulsion fractures typically require surgical referral rather than splinting alone 1
• Caused by forceful extension when the DIP joint is flexed

Joint Dislocations Requiring Splinting

PIP Joint Dislocations

• Dorsal dislocations: Reduce and buddy splint in slight flexion with extension-block splint 1
• Volar dislocations: Reduce and splint in full extension for 4-6 weeks 1
• Dorsal finger block splints prevent hyperextension while allowing flexion 5

DIP Joint Dislocations

• Volar dislocations: Splint in full extension for 2-3 weeks 1
• Dorsal dislocations: Splint in 15-30 degrees of flexion for 2-3 weeks 1

Key Clinical Pitfalls

Avoid these common errors:

• Failing to maintain continuous splinting in mallet finger—even brief removal can compromise healing
• Using traction splints for compression-type proximal phalanx fractures (risk of tenodesis)
• Over-immobilizing stable fractures—buddy taping allows early mobilization and prevents stiffness
• Splinting PIP joint unnecessarily in distal phalanx fractures—this causes preventable stiffness
• Missing flexor digitorum profundus avulsions that require surgery, not splinting

Treatment Duration Summary

• Distal phalanx (uncomplicated): 4-6 weeks DIP immobilization
• Mallet finger: 8 weeks continuous DIP extension
• Stable middle/proximal phalanx: 3-5 weeks buddy taping
• PIP dislocations: 4-6 weeks (volar) or until stable (dorsal with extension block)
• DIP dislocations: 2-3 weeks

The evidence shows that 86% of adult finger fractures are successfully managed non-operatively 6, and proper splinting technique is essential to achieving good functional outcomes without affecting long-term hand function or quality of life 6.