Triquetral bone fracture
Wrist pain after falling down on outstretched hand.
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An avulsed flake of bone is seen at the posterior aspect of the wrist demonstrating "pooping duck sign" suggesting triquetral bone injury.
Degenerative changes are seen.
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 this case, it will be associated with other carpal bone fractures are seen. On plain film, they are best detected on a lateral projection.