Description
The acromioclavicular joint is a synovial joint formed between the acromion of the scapula and the acromial end of the clavicle. It is a synovial plane joint, but either bone surface may be slightly convex and the other concave. The articular surfaces are covered in fibrocartilage and are surrounded by a fibrous joint capsule. The capsule is lined by a synovial membrane; strengthened superiorly by the acromioclavicular ligament, posteriorly by fibers of the trapezius muscle, and anteriorly by fibers of the deltoid muscle. The acromioclavicular ligaments strengthen the acromioclavicular joint and are complemented by the coracoclavicular ligament.
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Acromioclavicular Joint
The acromioclavicular joint is a synovial plane joint between the small, convex, oval facet on the lateral end of the clavicle and a concave area on the anterior part of the medial border of the acromion process of the scapula.
