Triquetral fracture

Radswiki et al.

Triquetral fracture is a carpal bone fracture that generally occurs on the dorsal surface of the triquetrum. It may be fractured by means of impingement from the ulnar styloid, shear forces, or avulsion from strong ligamentous attachments. It is the 2nd commonest carpal bone fracture, after the scaphoid.

Pathology

The usual injury mechanism is falling onto an outstretched hand in ulnar deviation. Less commonly, it may be caused by a direct blow to the dorsum of the hand, a situation where commonly other carpal fractures are seen.

Radiographic features

On plain film, dorsal avulsion injuries are best detected on a lateral projection, where typically an avulsed flake of bone is identified lying posteriorly to the triquetral bone. CT or MR images may be more sensitive than conventional radiographs for detection of avulsion injuries.

Treatment

Surgical intervention is rarely required, but a persistently symptomatic chip fracture may require excision.

Differential diagnosis

Imaging differential considerations include:


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Article Information

rID: 12722
System: Musculoskeletal
Tags: fracture, refs
Synonyms or Alternate Spellings:
  • Triquetrum fracture
  • Triquetral fractures
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    Case 1: with a concurrent radial styloid fracture
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    Scaphoid fracture
    Case 2: with a concurrent scaphoid fracture
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    Triquetral fractu...
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