Isolated dislocation of the second metacarpal at both ends

A dislocation of the second metacarpal at both ends is reported herein for the first time. Six weeks after injuring her right hand in a fall while cli mbing stairs, a 34-year-old woman visited our clinic with pain, swelling, a nd deformity of her hand. The radiographs showed a volar dislocation of the head and a dorsal dislocation of the base of the second metacarpal. The pr obable mechanism of injury was the hyperextension at the metacarpophalangea l joint. this force dislocated the metacarpal head toward the volar plate. Force then further continued along the second metacarpal shaft in the hyper flexed wrist, thus dislocating the base dorsally. We performed an open redu ction and K-wire fixation of the second metacarpophalangeal joint and an ar throdesis of the second carpometacarpal joint. At the six-month follow-up, the patient had restricted flexion (0 to 50 degrees) at the second metacarp ophalangeal joint, but full range of motion at the interphalangeal joints. The grip strength on the right side was 70% of that measured in the uninvol ved hand.