Houston Methodist. Leading Medicine

Shoulder FAQ


I recently separated my shoulder in a car accident. Can you explain what exactly this means?


There are many parts to the shoulder complex. Most people think of the shoulder as the upper arm bone in a socket. That's technically correct, but the "socket" is just a small part where the arm moves and turns. Above the socket, the collarbone attaches to the shoulder blade as it comes around from behind. A band of strong ligament holds these two bones together. Where these two bones meet is called the acromioclavicular or AC joint.

A shoulder separation occurs when the ligaments at the AC joint are torn or damaged, and these two bones are disrupted. Shoulder separations are graded as I, II, or III depending on the seriousness of the tear. An X-ray determines this. For example, if the ligaments are completely ruptured, the collarbone becomes dislocated. This is a grade III shoulder separation. A grade I is a minor ligament tear, and the bones stay in place. Grades II is in between these two extremes.

*Disclaimer:* The information contained herein is compiled from a variety of sources. It may not be complete or timely. It does not cover all diseases, physical conditions, ailments or treatments. The information should NOT be used in place of visit with your healthcare provider, nor should you disregard the advice of your health care provider because of any information you read in this topic.
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