What are the splinting recommendations for a suspected triquetral fracture when a scaphoid fracture cannot be ruled out?

Splinting Recommendations for Triquetral Fracture with Possible Scaphoid Fracture

When you cannot rule out a scaphoid fracture, immobilize the wrist in a thumb spica splint (or cast) in neutral to slight palmar flexion with no ulnar deviation, regardless of whether the triquetral fracture is confirmed. The scaphoid concern dictates your management until definitively excluded.

Initial Management Algorithm

Immobilization approach:

• Apply a thumb spica splint that includes the thumb to the interphalangeal joint 1
• Position the wrist in neutral or slight palmar flexion with no ulnar deviation 2
• The thumb position itself doesn't affect scaphoid fracture displacement, but standard practice includes thumb immobilization for suspected scaphoid injuries 3, 2

Key Clinical Decision Points

If scaphoid fracture is suspected but radiographs are negative:

• Standard practice has been 2 weeks of casting/splinting with repeat imaging 4
• However, recent high-quality evidence shows that 3-day bandaging followed by 2-week clinical reassessment is noninferior to 2-week casting for suspected scaphoid fractures with normal initial radiographs 5
• Only 10% of clinically suspected scaphoid fractures are actually fractured 5

For confirmed isolated triquetral chip fractures:

• These can be managed with simple wrist orthosis or cast 6
• Duration and type of immobilization (orthosis vs. cast) show no difference in outcomes 6
• Generally good outcomes with conservative treatment regardless of immobilization modality 6

Practical Management Strategy

Until scaphoid is definitively ruled out:

1. Initial immobilization: Thumb spica splint in neutral/slight palmar flexion
2. Imaging at presentation: Standard 3-view wrist radiographs (PA, lateral, semipronated oblique) 4
3. Follow-up timing: 10-14 days for repeat clinical assessment and radiographs 4
4. If scaphoid excluded at follow-up: Can transition to simple wrist orthosis for the triquetral fracture if desired, though outcomes are similar 6

Advanced imaging considerations if radiographs remain equivocal:

• MRI without contrast is most useful as it detects both fractures and ligamentous injuries 4
• CT without contrast effectively excludes occult fractures but misses ligament injuries 4
• Bone scan is not indicated 4

Critical Pitfalls to Avoid

• Don't immobilize in ulnar deviation - this worsens scaphoid fracture displacement 2
• Don't use simple wrist splints initially when scaphoid cannot be excluded - the thumb must be included 1
• Don't over-immobilize confirmed isolated triquetral fractures - once scaphoid is definitively excluded, these have good outcomes with minimal immobilization 6
• Don't assume all "snuffbox tenderness" is scaphoid fracture - only 10% of suspected cases are actual fractures 5

Evidence Quality Note

The recommendation prioritizes the most conservative approach (thumb spica immobilization) because the consequences of missing or inadequately treating a scaphoid fracture (nonunion, avascular necrosis, long-term disability) far outweigh the minor inconvenience of slightly more restrictive immobilization for a triquetral fracture. Once scaphoid is excluded, management can be liberalized based on recent evidence showing excellent outcomes with minimal immobilization for isolated triquetral fractures 6.