The 4-Stage Osteoarthritis Shoulder Anatomy Model from GPI Anatomicals, Lake Bluff, Ill, is a set of four shoulder models of reduced size designed to illustrate osteoarthritis. The four stages the models illustrate include: erosion to joint articular cartilage, progression of degenerative disease, osteophyte (bone spur) formation at the articular surfaces, and humeral head flattening. Normal stage includes a full scapula. Advanced stage shows acromioclavicular joint osteoarthritis and ligaments.

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[Source: GPI Anatomicals]