Carpometacarpal dislocation of the thumb associated with fracture of the trapezium.

Dislocation of the first carpometacarpal joint combined with a vertical intra-articular fracture of the trapezium is a rare injury. A case is described treated by open reduction of the trapezial fracture and reconstruction of the first intermetacarpal ligament using a slip of abductor pollicis longus tendon.