Here is something I found on the net:
In Brief: Osteolysis of the distal clavicle is a pathologic process involving resorption of the distal clavicle and is usually posttraumatic or caused by the repetitive microtrauma of weight lifting. Pain localized to the acromioclavicular joint and radiographs or bone scans showing pathology in the distal clavicle are diagnostic. Modification of activities, such as curtailment of weight lifting, often alleviates symptoms, but surgery is an option when conservative measures fail or for patients who cannot limit their activities.
Disorders of the acromioclavicular (AC) joint are a common cause of shoulder pain and generally involve the ligaments, bones, or articular surfaces. Isolated involvement of the articular surface can result from arthritis or osteolysis. Osteolysis of the distal clavicle is typically associated with AC pain and, on radiographs, a loss of subchondral bone detail, AC separation, and cystic changes (1).
Treatment
Treatment of the patient with osteolysis needs to be individualized. Factors to be considered include the extent of disability, hand dominance, activity level, and age.
Nonoperative treatment. Patients are initially started on a nonsteroidal anti-inflammatory drug (NSAID) and instructed in activity modification. Specifically, weight lifters should avoid bench presses, dips, flies, push-ups, and other lifts that elicit pain. Most patients will respond to activity modification; however, symptoms often recur if the previous weight-training schedule is reinstituted (2). Intra-articular corticosteroids can be considered for short-term symptom relief, but studies to date have not shown any long-term benefits (11). Because patients generally retain normal shoulder function, formal physical therapy is generally not initiated unless there is concomitant shoulder pathology. Patients whose condition does not respond to conservative management or who cannot limit their activities require surgery.
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