[Reposition instrument for Bennett's fracture-dislocation].

A special hook and plate can be used to adapt small central fragments in the open reduction of Bennett's fracture-dislocation. The hook is positioned behind the small central fragment and compression exerted between the hook and a plate attached to the opposite side of the base of the first metacarpal bone using an adjustable nut, thus holding the fragments together. The reduction device simplifies X-ray controls and internal fixation with Kirschner wires.