Articular Disc of Acromioclavicular Joint (Left)
Discus articulationis acrominoclavicularis
Read moreAnatomical 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.
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
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.
