athlete suffering from sprained AC joint

Common Causes of a Sprained AC Joint

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The AC joint, or acromioclavicular joint, is the point where the acromion—a finger-like protrusion at the top of your shoulder blade—meets the clavicle, or collar bone. Your AC joints allow you to raise your arms over your head and are also involved in moving your shoulder blades.   While the shoulder as a whole is more susceptible to injury than other joints because of its mobility, the AC joint is…