An injury to the Acromioclvicular joint (AC joint) is a common sports injury, often occurring as the result of a direct fall on the shoulder. Athletes engaging in contact sports such as football, wrestling, rugby, and hockey are particularly prone to this type of shoulder injury. This sports injury is responsible for tears in the ligaments around the AC joint. With weakened ligaments, the weight of the arm causes irritation to the clavicle which has been separated from the shoulder blade. Depending upon the severity of your injury (ranging from mild discomfort to a noticeable deformity as the result of the AC joint being completely out of place) Dr. Nadel may recommend shoulder surgery to best alleviate your pain. Complete AC reconstruction, (whereby Dr. Nadel reconstructs the ligaments that attach to your collarbone) may be necessary.