Model Size (4 each) 2” x 3-1/2” x 7” Card Size 8-1/4” x 6-1/4” Base Size 10-5/8” x 6-1/4” Set of four life-size models illustrate degenerative joint disease (osteoarthritis). Disease-free (normal) knee also includes additional important structures including ligaments, tendons and patella. The other three models demonstrate articular surface degeneration and the development of osteophytes (bone spurs).