Complete posterior acromioclavicular dislocation. A case report.

While acromioclavicular joint injury is not uncommon, a complete posterior dislocation in which the distal clavicle penetrates and is entrapped by the trapezius muscle is among the most rare. Early open reduction with reconstruction of the periosteal-muscular envelope as well as repair of the coracoclavicular ligaments permitted a rapid and full recovery. No previous report has indicated any concurrent pulmonary problems, but as this case report and literature review indicate, a careful evaluation of the pulmonary status is mandatory since pneumothorax and pulmonary contusions are possible.