Knee joint model articulated and made for easy medical teaching understanding and presentations of the anatomy of the knee joint. The ligaments, cartilage and muscles are made of durable flexible material to insure many years of use. Demonstrating flexion / extension, external / internal rotation. Shows the relationship of the articular cartilage to the meniscus. This Articulated Deluxe Knee Model is used by medical schools to aid students learning anatomy. Also used in legal presentations and by doctors for office demonstrations. Extensive research has been done into production of this Knee Model. Made in USA