The medial clavicle fracture is a rare injury and almost all the times conservatively treated. Therefore, the number of operations reported in the literature are limited. Posterior dislocation can result in serious complications and such injuries require rapid diagnosis followed by effective treatment to avoid future complications. The present case reports a case of a 33-year-old healthy man that was involved in a high-fall, being diagnosed with a rare displaced medial clavicular fracture associated with an unstable posterior lateral fragment dislocation surgically treated. Imagiological images and intraoperative photographs are presented. The authors collected this case in order to report this rare and complex injury. The treatment chosen to manage seems to give a good functional and radiographic recovery.