AC Joint Separation/Rupture
An acromioclavicular joint separation, or AC separation, is a very frequent injury among physically active people. In this injury, the clavicle or collarbone separates from the scapula or shoulder blade. It is commonly caused by a fall directly on the “point” of the shoulder or a direct blow received in a contact sport. Football players and cyclists who fall over the handlebars are often subject to AC separations.
In general, most AC injuries don’t require surgery. There are certain situations, however, in which surgery may be necessary. Most patients recover with full function of the shoulder. The period of disability and discomfort ranges from a few days to 12 weeks depending on the severity of the separation. Disruption of the AC joint results in pain and instability in the entire shoulder and arm. The pain is most severe when the patient attempts overhead movements or tries to sleep on the affected side.