A shoulder separation (acromioclavicular joint injury)occurs when the outer end of the collarbone (clavicle) separates from theend (acromion) of the shoulder blade because of torn ligaments. This injuryoccurs most often from a blow to a shoulder or a fall on a shoulder or outstretchedhand or arm.

Signs and symptoms of a separated shoulder include:

• Severe pain at the moment the injury occurs.
• Limited movement in the shoulder area (because of pain,not weakness).
• Swelling and bruising.
• Possible deformity. The outer end of the collarbone maylook out of place, or there may be a bump on top of the shoulder.

Treatment may include applying ice, keeping the shoulderstill (immobilized) with a sling or wrap, and taking medication to relievepain, inflammation, and swelling. After symptoms improve, physical therapymay help strengthen muscles in the shoulder region and prevent frozen shoulder(adhesive capsulitis). Occasionally surgery may be needed to repair torn ligaments.

Healing may take 2 to 10 weeks, depending on the severityof the injury.