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Acromial-clavicular joint.
Last reviewed: 07.07.2025
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The acromioclavicular joint (art. аromio-clavicularis) is flat in shape, formed by the acromial end of the clavicle and the articular surface of the acromion. In 30% of cases, the joint has an articular disc (discus articularis). The capsule is attached along the edges of the articular surfaces. From above, it is reinforced by the acromioclavicular ligament (lig. acromio-claviculare). Medially from the joint, below the clavicle, there is a powerful coracoclavicular ligament (lig. coraco-claviculare), consisting of two parts. The first part, located laterally, is attached to the trapezoid line of the clavicle and is called the trapezoid ligament (lig. trapezoideum). The second part of the acromioclavicular ligament, located medial to the trapezoid ligament, is attached to the cone-shaped tubercle - this is the conical ligament (lig. conoideum).
The acromioclavicular joint allows movements relative to three axes. The amplitude of these movements is insignificant, since the ligaments, especially the coracoclavicular ligament, significantly limit mobility in this joint.
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