Presentation
Wrist pain after falling down on outstretched hand.
Patient Data
Age: 70 years
Gender: Male
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An avulsed flake of bone is seen at the posterior aspect of the wrist demonstrating the "pooping duck sign", suggesting triquetral bone injury.
Degenerative changes are seen.
Case Discussion
Triqetral bone fracture is the second commonest carpal bone fracture, after the scaphoid. The usual mechanism of injury 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; in the latter case, it will be associated with other carpal bone fractures. On plain film, they are best detected on the lateral projection.
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