Management of Chip Fracture of the Proximal Phalanx of the Fifth Digit
For a chip fracture of the proximal phalanx of the fifth digit, treat conservatively with buddy taping to the fourth digit and immediate mobilization—this approach achieves excellent functional outcomes with minimal complications.
Initial Diagnostic Approach
Start with standard 3-view radiographic examination of the hand (posteroanterior, lateral, and oblique views) to confirm the fracture and assess for displacement, articular involvement, and rotational deformity 1. An internally rotated oblique projection in addition to the standard externally rotated oblique increases diagnostic yield for phalangeal fractures 1.
Conservative Management Protocol
The evidence strongly supports buddy taping with immediate mobilization for chip fractures and base fractures of the fifth proximal phalanx 2. This approach prioritizes function over anatomic perfection and consistently delivers superior outcomes compared to rigid immobilization.
Specific Treatment Steps:
- Perform closed reduction if there is significant displacement (though most chip fractures require minimal manipulation)
- Apply buddy taping to the fourth digit immediately after reduction
- Allow immediate mobilization of all finger joints
- No rigid splinting required for stable chip fractures
Evidence Supporting This Approach:
A prospective study of 53 consecutive base fractures of the fifth proximal phalanx treated with buddy taping showed 2:
- High overall patient satisfaction
- Only 4 patients reported mild pain
- All but one patient regained full flexion
- Only 2 patients had extension deficits
- Zero cases of nonunion or delayed union
- Only 3 cases of malrotation (none requiring surgery)
When to Consider Alternative Management
Surgical intervention is rarely needed for chip fractures but consider referral if:
- Articular involvement exceeds one-third of the joint surface
- Displacement causes rotational deformity (scissoring)
- Fragment size is large enough to compromise joint stability
- Initial closed reduction cannot be maintained
Critical Pitfalls to Avoid
Do not immobilize in a rigid cast. Traditional static plaster immobilization leads to:
- Interphalangeal joint stiffness
- Prolonged recovery time
- Worse functional outcomes
- No improvement in fracture healing rates
Do not delay mobilization. The key to optimal outcomes is immediate active range of motion exercises, which prevent:
- Tendon adhesions
- Joint contractures
- Rotational deformities that develop from compensatory movement patterns
Follow-Up Protocol
- Clinical reassessment at 1-2 weeks to ensure buddy taping is maintained and patient is performing active exercises
- Radiographic follow-up at 2-3 weeks only if clinical concern for displacement or malunion
- Continue buddy taping for 3-4 weeks total until fracture consolidation
- Most fractures achieve union without complications using this protocol 2, 3
Functional Outcomes
Recent systematic review data demonstrates that conservatively managed extra-articular proximal phalanx fractures achieve 3:
- Mean total active motion of 249°
- 99.5% union rate (387/389 fractures)
- Minimal need for surgical intervention
A large multi-institutional study of 634 pediatric proximal phalanx base fractures showed only 0.93% rotational malalignment rate with conservative management 4, supporting the safety of this approach even in younger patients where remodeling potential exists.
Key Principle
The overriding goal is functional recovery, not anatomic perfection. Chip fractures of the fifth digit proximal phalanx tolerate minor degrees of angulation and displacement without functional consequence. Early mobilization with buddy taping prevents the soft tissue complications (tendon adhesions, joint stiffness) that cause far more disability than minor fracture malunion 2, 5, 6.