Abstract
In brief Chronic pain at the acromioclavicular (AC) joint can suggest several diagnoses. When evaluating a patient's pain and range-of-motion deficits, remember that an AC joint can be the sole source of discomfort. The physical exam can help rule out impingement syndrome, rotator cuff tear, scapular winging, and systemic disorders; radiographs can help exclude other pathologies. Most patients respond to conservative treatment: anti-inflammatory medications, ice massage, and activity modification. However, pain that persists 6 months or longer may warrant surgery.