Dorsal dislocation of trapezoid: Uncommon case

Abstract

Dislocation of carpometacarpal joints are uncommon. They represent 1% of all injuries of hand and wrist region [1]. Up to 70% of carpometacarpal dislocations are missed or misdiagnosed [2]. Dorsal dislocations of the trapezoid are rare. We present an uncommon case of dorsal dislocation of the trapezoid with the second metacarpal base at the scaphotrapeziotrapezoidal (STT) due to motor vehicle accident. Dorsal dislocation of the trapezoid is associated with high-velocity trauma such as road traffic accidents. These cases typically occur concomitantly with other fractures or dislocations of the carpal bones or carpo-metacarpal (CMC) joints. Many reports of delayed diagnosis due to concomitant injuries and difficulty of recognition on plain radiographs have been reported. We report an uncommon case with concomitant injury to the metacarpal and phalangeal bones.