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Posterior acromioclavicular dislocation



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Abstract

Posterior dislocation of the acromioclavicular joint with the lateral end of the clavicle locked behind the acromion has only rarely been described. This paper present such a case diagnosed two weeks after the shoulder was injured in an accident. The clavicle was locked behind the articular surface of the acromion, restricting the movement of the shoulder and causing considerable pain. Anteroposterior radiographs showed a high-riding clavicle but no gap in the joint, but the axial view showed the dislocation. At operation the coracoclavicular ligaments were found overstretched but not ruptured. As reduction of the acromioclavicular joint was not possible, the lateral end of the clavicle was resected. Although the result was perfect, we consider the correct treatment should be early closed or open reduction of the acromioclavicular joint.

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