The acromioclavicular joint is a diarthrodial joint that, together with the sternoclavicular joint, connects the upper extremity to the axial skeleton. The support of the acromioclavicular joint is through the acromioclavicular and coracoclavicular ligaments and the strong attachment of the trapezius and deltoid muscles ( Fig...i263:3). The acromioclavicular joint is surrounded by a thin capsule, which is reinforced by the acromioclavicular ligaments. The superior fibers of this ligament blend with the fascia of the trapezius and deltoid, which attach to the clavicle and acromion. The acromioclavicular ligaments provide horizontal stability to the joint. The tough coracoclavicular ligaments consist of two parts, the more lateral trapezoid and the medial conoid. They attach the distal inferior clavicle to the coracoid process of the scapula. The coracoclavicular ligament is the major suspensory ligament of the upper extremity and provides vertical stability to the acromioclavicular joint.
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