G1800 4-STAGE OSTEOARTHRITIS SHOULDER JOINT: Set of four shoulder models, reduced size,
illustrating degenerative joint disease (osteoarthritis) of glenohumeral joint: 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.