uchc.edu Acromioclavicular (AC) joint injuries are more common than sternoclavicular (SC) joint injuries. There is a spectrum of AC joint traumatic injuries that ranges from a ligament sprain to a ...

The collarbone forms the sternoclavicular joint with the sternum (breastbone) at one end and the acromioclavicular joint with the acromion (part of the shoulder blade) at the other end.