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Acromioclavicular Joint (Left)
Connective Tissue

Acromioclavicular Joint (Left)

Articulatio acromioclavicularis

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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

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Like the acromioclavicular joint, the sternoclavicular joint contains an intraarticular fibrous disk that allows rotation of the clavicle during abduction and elevation.

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