12/15/2023 0 Comments Ziptite 2 fit systemThese five cases were all voluntary, i.e., not atraumatic. If no step can be palpated on the superior aspect of the acromioclavicular joint, it is likely that the patient has only suffered a sprain.Ītraumatic ACJ is a very rare condition, with only five cases described in the literature previously. described another asymptomatic dislocation in a patient previously diagnosed with cerebral palsy, causing hemiparesis and associated hyperlaxity.Īfter an injury, the patient has pain and swelling in the shoulder region and increased tenderness over the ACJ. Janecki was the first to describe a patient with voluntary dislocation of the ACJ although not confirmed, the patient had features compatible with a connective tissue disorder. have pointed to hyperlaxity as the main cause of these situations. The mechanism of injury has been suggested to be forced depression of the acromion due to a fall onto the point of the shoulder. have suggested that obliquity of the articular surface may predispose one to traumatic disruption. , patients with severe instability are at risk of developing anatomical changes in scapular alignment and kinematics that may lead to impaired rotator cuff function. However, the main movement that takes place in the joint is rotation in the long axis of the clavicle. The ACJ is involved in flexion, extension, and sliding where the space between the acromion and clavicle increases or decreases. This ACJ dislocation involves an injury to the acromioclavicular ligament with or without rupture of the coracoclavicular ligament. The stability of the ACJ joint therefore depends primarily on the coracoclavicular and acromioclavicular ligaments. These ligaments are primarily responsible for restricting (stabilizing) the posterior displacement of the outer end of the clavicle. Its capsule is reinforced by the superior and inferior acromioclavicular ligaments, of which the first is the strongest structure. ![]() ![]() The acromioclavicular joint is a flat joint. Dislocation of the acromioclavicular joint (ACJ) accounts for about 9% of shoulder injuries in the general population and increases to 40% among athletes participating in highly competitive impact sports.
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