Abstract
A palmar lunate transtriquetral fracture dislocation with a concomitant radial styloid avulsion fracture has not been described before in the literature. This injury represents an interesting variation of stage IV perilunar instability. Treatment was complicated by persistent scapholunate dissociation (rotary subluxation of the scaphoid) after attempted closed reduction and percutaneous pinning. At open reduction, the proximal half of the triquetrum, which had been dislocated palmarward with the lunate and which had been thought to be reduced after our attempted closed reduction was indeed returned to its normal position. However, it was rotated 180 degrees on its transverse axis. Restoration of the normal scapholunate interval was not possible until the triquetral fracture was reduced.
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