4 Stage Hip Osteoarthritis Anatomical ModelAnatomical Hip 4 Stage Osteoarthritis Model with Display Stand & Education Card. Four different hip socket models demonstrate the stages of the Arthritic Hip from normal presentation through to advanced degeneration of the joint. The models include illustrations of degenerative joint disease such as: Osteoarthritis Osteoporosis Fractures Damage to joint cartilage Formation of osteophytes or bone spurs.