Triquetral fracture

Triquetral fractures are carpal bone fractures generally occuring on the dorsal surface of the triquetrum. The triquetral may be fractured by means of impingement from the ulnar styloid, shear forces, or avulsion from strong ligamentous attachments. They are the second commonest carpal bone fracture, after the scaphoid.

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.

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 (see pooping duck sign).

CT or MR may be more sensitive than conventional radiographs for detection of avulsion injuries.

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

Imaging differential considerations include:

Fractures
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Article information

rID: 12722
Synonyms or Alternate Spellings:
  • Triquetrum fracture
  • Triquetral fractures

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Cases and figures

  • Figure 1: illustration
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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...
    Case 3
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  •  Case 5
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  • Case 17
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  • Case 18
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  • Case 19: with distal radius and distal ulnar fracture
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  • Case 20
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