Review Question - QID 219196

A 21-year-old college football player is hit directly in the chest and comes to the sideline complaining of pain over the left shoulder and clavicle. Several minutes later you notice he is struggling to catch his breath and having difficulty swallowing. You call for an ambulance to take him to the emergency department where radiographs of his chest and shoulder are read as normal. CT scan of his chest is shown in Figure A. Based on the results of the scan, he is scheduled for urgent closed reduction under general anesthesia. What injured ligament is the most important restraint for this joint?