Abstract
Acromioclavicular joint injury is a common contact sports-related injury in the upper extremity1. These injuries range from a simple sprain of the acromioclavicular ligament to a complete dislocation (complete separation) of the joint, which involves disruption of the acromioclavicular and coracoclavicular ligaments and varying degrees of injury to the deltoid and trapezius muscles and fascia. Rockwood et al.2 classified acromioclavicular joint injuries on the basis of the number of ligaments involved, the severity of injury, radiographic findings (including the position of the clavicle relative to the acromion), and reducibility of the acromioclavicular joint with shoulder shrugging (Table I). The Upper Extremity Committee of ISAKOS (International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine) recently proposed a subclassification of the original Rockwood type-III dislocation into …
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