Acromioclavicular joint sprains

[Luis Fok]

Acromioclavicular joint sprains are common, usually resulting from a fall on the shoulder or, less often, an outstretched arm.
(See also Overview of Sprains and Other Soft-Tissue Injuries.)
Several ligaments surround this joint, and depending on the severity of the injury, one or all of the ligaments may be torn. Severe sprains tear the acromioclavicular and coracoclavicular ligaments.
The acromioclavicular joint is commonly injured when the clavicle is fractured.
Patients have pain and tenderness at the acromioclavicular joint.