Acromioclavicular (AC) joint sprains are injuries to the ligaments at the joint where the clavicle (collarbone) attaches to the acromion (roof of the shoulder) of the scapula (shoulder blade). These injuries are commonly referred to as “shoulder separations.” The ligaments that run from the clavicle to the acromion, th acromioclavicular ligaments, or to the coracoid, the corococlavicular ligaments, help to anchor the collarbone to the scapula (shoulder blade). A sprain indicates that the ligament between the bones is either stretched or torn, thus disrupting the stability of the acromioclavicular joint.
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