what is an ac sprain in your shoulder

An AC (acromioclavicular) joint sprain, also known as a shoulder separation, occurs when an injury damages the ligaments in the AC joint. The AC joint is where the shoulder blade (scapula) meets the collarbone (clavicle) . The highest point of the shoulder blade is called the acromion, and strong tissues called ligaments connect the acromion to the collarbone, forming the AC joint. AC joint sprains are commonly caused by accidents or injuries that force the AC joint apart, such as falling onto your shoulder, falling onto an outstretched hand, or getting a direct blow to your shoulder. Symptoms of an AC joint sprain can vary depending on how serious the injury is and may include shoulder pain, soreness, swelling, bruising, change in the shoulders shape, bulge above the shoulder, shoulder that appears to droop, collarbone that moves upward, and limited movement in the shoulder. Treatment for an AC joint sprain will depend on how serious the strain is and can range from rest and physical therapy to surgery.