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 (ACJ) is a diarthrodial joint that connects the acromion to the distal clavicle and which is surrounded by ligaments and a capsule.
