Volar Splint for 2-Week Triquetral Avulsion Fracture
For a triquetral avulsion fracture, use a volar (forearm) splint for immobilization, typically for 3 weeks rather than just 2 weeks, as this duration provides optimal healing for most non-displaced avulsion fractures.
Splint Type and Positioning
A volar (palmar) splint is the standard treatment for triquetral avulsion fractures 1, 2. This splint extends from the forearm to immobilize the wrist while allowing finger mobility. The volar approach is preferred because:
- It provides adequate immobilization of the wrist joint
- Allows monitoring of the dorsal aspect where swelling typically occurs
- More comfortable for patients during the healing period
- Facilitates functional use of the fingers
Duration of Immobilization
While you mention 2 weeks, the evidence suggests 3 to 6 weeks of immobilization is more appropriate 1. Specifically:
- Minimum 3 weeks for simple dorsal chip fractures 3
- 4 to 6 weeks for non-displaced body fractures 1, 4
- Bone fragment healing typically requires 6 to 8 weeks when union occurs 3
Two weeks is likely insufficient for adequate healing and may risk complications.
Critical Caveat: Rule Out Associated Injuries
Before committing to conservative splinting, you must evaluate for associated ligament injuries, particularly if this is a volar avulsion fracture rather than a dorsal chip fracture 5. This is crucial because:
- Volar triquetral avulsion fractures are associated with significant lunotriquetral ligament tears and carpal instability in most cases 5
- These injuries are easily missed on standard radiographs 5
- They may require surgical intervention rather than splinting alone 5, 4
When to Suspect Ligament Injury:
- Young athletic patient with high-energy mechanism
- Persistent pain beyond expected timeframe
- Volar-sided fracture fragment (rather than dorsal)
- Clinical signs of instability on examination
If ligament injury is suspected, obtain stress radiographs, MRI, or consider arthroscopy before committing to conservative treatment 5.
Treatment Algorithm
For simple dorsal chip fractures (most common):
- Volar splint immobilization
- 3 weeks minimum duration
- No surgical intervention needed 3
- Excellent prognosis with conservative treatment 1, 3
For body fractures without displacement:
For displaced fractures or those with instability:
- Surgical fixation required 1, 4
- Often indicates perilunate injury pattern
- Requires ligament repair and K-wire stabilization 4
Common Pitfall
The most significant pitfall is missing a volar avulsion fracture with associated ligament injury 5. These patients may be inappropriately treated with simple splinting when they actually need surgical intervention. All five patients in one series who were treated conservatively (either with prolonged splinting or arthroscopic debridement) had persistent pain and instability at 1-year follow-up 5.