الفهرس 
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Abstract
Injuries of acromioclavicular (AC) joint are relatively common in young athletes. Male athletes are at greater risk than female athletes. The acromioclavicular joint provides a ‘keystone’ link between the scapula and the clavicle.
Applied Anatomy of the acromioclavicular (AC) joint:
The acromioclavicular (AC) joint is made up of two bones (the clavicle and the acromion), two sets of ligaments, and a meniscus inside the joint.
The presence of fibrocartilaginous disc puts the AC joint to develop degenerative changes more frequently than they do the sternoclavicular joint. Another point of concern that the surface area of the AC joint is small and there is high compressive loads transmitted from the humerus to the chest by muscles such as the pectoralis major and the stresses on the AC joint can be very high.
As a result, the distal clavicular articular surface is prone to compressive failure, as seen in osteolysis of the distal clavicle in weightlifters.
The acromioclavicular joint capsule and the capsular ligaments are the primary restraints of the distal clavicle to anterior to posterior translation. The superior AC ligament is more substantial and thicker than the inferior AC ligament. The superior AC ligament attaches to the clavicle and its fibers interdigitate with the musculotendinous aponeurosis of the deltotrapezial fascia. The joint is further strengthened by this deltotrapezius aponeurosis.