We report a case of volar fourth and fifth carpometacarpal (CMC) joint dislocation complicated by a hamate hook fracture. The\nCMC joint was reduced in a closed fashion and temporally fixed with Kirschner wires. Using intraoperative computed\ntomography, the displaced fracture of the hamate hook was reduced by open reduction and internal fixation and fixed with a\nscrew. We suggest that this rare injury was caused by the over contraction of the flexor carpi ulnaris and avulsion force from the\nligamentous structure around the pisiform, hamate, and metacarpal bones.
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