X-ray-negative posterior sternoclavicular dislocation after minor trauma.

Posterior sternoclavicular dislocation is a rare injury that must be recognized by the emergency physician because failure to rapidly reduce can lead to serious vascular complications. A high index of suspicion must be maintained in the appropriate setting because these injuries are difficult to detect on physical examination as well as on plain radiography. We present a case of a 19-year-old man with an isolated posterior sternoclavicular dislocation, in the setting of minor blunt trauma. The correct diagnosis required multiple imaging modalities over 2 emergency department visits and was ultimately successfully managed with intraoperative reduction.