Carpometacarpal dislocation second to fifth with associated hamate fracture: A case report of rare injury

Introduction: Carpometacarpal (CMC) dislocation of the second to fifth metacarpals is an extremely rare hand injury that results from high-energy trauma. It is inherently unstable, especially if it is associated with concomitant carpal or metacarpal fractures.Case presentation: We report the case of an 18-year-old male who sustained a motorbike injury at the level of the second to fifth CMC joints, which was associated with a hamate fracture. The patient failed initial conservative treatment, and so one week later he underwent closed reduction of the second to fifth carpometacarpal dislocations and Kirschner wire fixations from the second to fifth metacarpals. He then underwent open reduction and internal fixation of the hamate fracture using a mini-fragment plate and screws.Discussion: This type of hand trauma is often overlooked due to radiological misinterpretations. It is important to pay attention to significant soft tissue swelling in this injury. Percutaneous pinning is still considered the gold standard and safest procedure for this injury.Conclusion: This is a rare hand injury that requires careful radiological assessment and meticulous and stable reduction. We believe that open reduction is advantageous in certain circumstances.