AC Joint Separation (Shoulder Separation)

A shoulder separation involves the AC joint (the small joint where the clavicle meets the shoulder blade at the top). A shoulder dislocation involves the main glenohumeral joint (the ball-and-socket where the arm bone meets the glenoid). They are entirely different injuries at different parts of the shoulder, treated differently, and often confused because both cause shoulder pain after trauma.

This remains one of orthopaedic surgery's most debated questions. Grade III involves complete rupture of the primary ligaments, with the clavicle elevated moderately. Most studies show equivalent long-term outcomes between operative and non-operative treatment for the average patient. Surgery is more commonly recommended for throwing athletes, overhead laborers, young patients with high physical demands, or those with significant clavicle displacement. A specialist consultation helps determine the best approach.

In Grade III and higher injuries, a permanent bump from the elevated clavicle is common even after full healing. The bump is visible but usually asymptomatic once the acute injury heals. Most patients are not bothered by the cosmetic change. For patients with significant ongoing pain or cosmetic concern, revision surgery can address the prominence, though this is rarely necessary for pure cosmetic reasons.