The acromioclavicular joint disc is a fibrocartilaginous intraarticular disc in the AC joint, typically partial (meniscoid) rather than complete, separating the clavicular and acromial articular surfaces.
Reduces congruence mismatch between the clavicular and acromial surfaces, distributes contact forces across the AC joint, and may degenerate with age contributing to AC joint arthropathy.
AC joint disc degeneration is the primary pathological finding in AC joint osteoarthritis producing superior shoulder pain on cross-body adduction. Distal clavicle resection (Mumford procedure) removes the degenerate joint surfaces including the disc remnant.
Progressive fibrocartilaginous disc degeneration producing AC joint osteoarthritis with superior shoulder pain and cross-body adduction tenderness, treated by distal clavicle excision.
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