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Articular Disc of Acromioclavicular Joint (Left)
Connective Tissue

Articular Disc of Acromioclavicular Joint (Left)

Discus articulationis acrominoclavicularis

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Anatomical Relations

The articular disc of the acromioclavicular joint is located within the fibrous capsule of the acromioclavicular joint. It sits between the opposing acromion of the scapula and clavicle. Its margin attaches to the acromioclavicular ligament which surrounds the joint.

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Structure

During the first two years of life, the acromioclavicular joint is a fibrocartilaginous union. Due to increased usage of the upper limb, a joint space develops at each articulating surface that leaves behind a fibrocartilaginous meniscus, the articular disc, which separates the acromioclavicular joint into lateral and medial compartments (Levangie and Norkin, 2005). Over time, the disc perforates (in adults) and may become incomplete inferiorly.

Function

Like other articular discs, the articular disc of the acromioclavicular joint acts as a cushion that absorbs shock and friction.

References

Levangie, P. K. and Norkin, C. C. (2005) Joint Structure and Function: A Comprehensive Analysis. F.A. Davis Company.

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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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