Osteolysis of the acromial end of the clavicle was seen in a 30-year-old man who had played a great deal of handball and softball, apparently as the result of repeated stress to the acromioclavicular articulation. Such osteolysis appears to be self-limited and requires no specific therapy other than rest of the affected area.
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Elwood Q. Seymour (1977) studied this question.