We report here two fully documented cases of hamatometacarpal fracture-dislocation following trauma and treated in our hospital. In our cases, the patients suffered hamate fracture in association with metacarpal dislocation. In the first case, a dorsal oblique fracture of the hamate was associated with a dorsal dislocation of the base of the fourth metacarpal. In the second case, a dorsal oblique fracture of the hamate was not associated with a dorsal dislocation of the base of the fifth metacarpal. This diagnosis should be suspected on initial review of plain radiographs, which must include an oblique view because of diagnostic difficulty for this injury. We recommend three dimensional computed tomography (3D-CT) in any patient presenting with pain after blunt trauma to the hand to prevent in diagnosis. Open reduction and internal fixation of the fracture is indicated and relevant for displaced fracture.

Nous rapportons deux cas de fracture de l'hamatum associée à une luxation carpométacarpienne. La radiographie simple ne permettait pas le diagnostic, mais le scanner-3D montrait précisement la fracture et le déplacement. Les patients ne présentent actuellement aucun problème, après deux ans du recul. À notre connaissance, ce type d'imagerie pour diagnostiquer cette lésion n'avait jamais été décrite.