The acromioclavicular (AC) joint is the junction between the clavicle and acromion process of the scapula. Subluxations and dislocations of this joint are colloquially called “shoulder separations” (perhaps to preserve the terms shoulder subluxation and shoulder dislocation for the glenohumeral joint). Patients with AC joint separations commonly present with pain after an athletic injury or fall onto the shoulder. Injuries to the joint rarely require surgical correction. They are generally managed non-operatively with excellent outcomes. The AC joint is also subject to early degenerative change. Arthritis of the acromioclavicular joint is a common cause of focal pain, especially in athletes.
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