The AC joint, or acromioclavicular joint, is a joint in the shoulder region that connects the clavicle (collarbone) to the acromion process of the scapula (shoulder blade). It is located at the top of the shoulder, just above the shoulder joint proper (the glenohumeral joint).
The AC joint is important for providing stability and support to the shoulder complex, especially during overhead movements. It is also involved in transmitting forces from the upper extremity to the trunk.
Injuries to the AC joint are relatively common, especially in athletes or individuals who participate in activities that involve repetitive overhead motions. Common AC joint injuries include sprains, dislocations, and fractures.
Treatment for AC joint injuries varies depending on the severity of the injury, but may include rest, ice, compression, and physical therapy. In more severe cases, surgery may be necessary to repair or reconstruct the joint.