Acromioclavicular subluxation is usually caused by a fall on the shoulder which tears the acromioclavicular ligaments. There is upward subluxation of the clavicle. In severe injuries the coracoclavicular ligaments may also be torn and there may be complete dislocation of the joint.
Note that if there is tenderness but no deformity, the injury is likely to be subluxation rather than dislocations.
This injury does not require any special treatment. The arm is rested in a sling until the pain subsides. Usually the arm is taken out of the sling after about a week and then shoulder exercises are begun.
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