Transtriquetral perihamate ulnar axial dislocation and palmar lunate dislocation.

Transtriquetral perihamate ulnar axial dislocation associated with palmar lunate dislocation is a rare condition. We could find no other similar cases reported. The mechanism of injury was a combined anteroposterior crushing force that caused axial disruption of the carpus and the metacarpals and wrist hyperextension that caused the transtriquetral lunate dislocation. Our patient was treated with open reduction and internal fixation with good result.