acromioclavicular dislocation

acromioclavicular dislocation

The joint between the acromium process of scapula and the distal end of the clavicle, the location of most shoulder separations, which are particularly common in collision sports—e.g., ice hockey, rugby, American football, and Aussie-rules football, but not uncommon in swimming, horseback riding, mountain biking, and snow skiing—due either to direct trauma to the shoulder or falling on outstretched hands.