Optimal Splint for Pisiform Fracture
For non-displaced pisiform fractures, use a below-elbow ulnar gutter splint with the wrist in mild palmar flexion for 2-4 weeks, followed by progressive mobilization.
Immobilization Strategy
The evidence strongly supports conservative management with short-term rigid immobilization for uncomplicated pisiform fractures:
A below-elbow ulnar gutter splint positioned in mild palmar flexion is the optimal choice for isolated, non-displaced pisiform fractures 1. This positioning protects the pisotriquetral joint while allowing adequate immobilization.
Duration of immobilization should be 2-4 weeks, with most patients achieving clinical healing and full range of motion by 4-6 weeks post-injury 2, 1. The shorter 2-week duration appears sufficient for non-displaced fractures with early mobilization protocols 1.
Forearm volar splints are an acceptable alternative when ulnar gutter splints are unavailable, as demonstrated in emergency department settings 3. However, ulnar gutter splints provide more targeted immobilization of the ulnar wrist.
Key Clinical Considerations
Rigid immobilization is superior to removable splints for acute carpal fractures. While the American Academy of Orthopaedic Surgeons guidelines address distal radius fractures specifically, they recommend rigid immobilization over removable splints for displaced fractures 4. This principle extends to pisiform fractures requiring stable healing.
Splints accommodate swelling better than casts, making them ideal for acute fracture management 5. Given that pisiform fractures typically present with localized swelling, splints provide the necessary immobilization while allowing for soft tissue expansion.
Displaced Fractures Require Different Management
Displaced pisiform fractures with pisotriquetral joint disruption require open reduction and K-wire fixation rather than simple immobilization 2. Excision of the pisiform is not indicated in acute injuries but is reserved for chronic pain, nonunion, or pisotriquetral arthritis that fails conservative management 2, 6, 7.
Common Pitfalls
Missing the diagnosis entirely: Pisiform fractures are rare and easily overlooked. Maintain high clinical suspicion with ulnar-sided wrist pain following trauma 1. Multiple radiographic views (AP, lateral, and oblique) are essential for diagnosis 1.
Over-immobilization: Excessive immobilization beyond 4 weeks can lead to joint stiffness and chronic pain 5. Begin progressive mobilization at 2-4 weeks based on clinical healing.
Failing to identify associated injuries: Always assess for concomitant triquetrum fractures, distal radius fractures, or wrist dislocations, which alter management 3, 2.