This high-quality functional knee joint model of a naturally-sized right knee joint with ligaments shows the anatomy and possible physiological movements (e.g. abductions, anteversion, retroversion, internal and external rotation) in exceptional detail. This knee joint model also clearly defines the ACL and PCL. The color of the natural-cast bones of the knee joint is extremely realistic. The cartilage on the knee joint surfaces is marked blue. Knee joint model consists of thigh stump, shinbone stump and calf bone stump, menisci and patella. Functional Knee joint mounted on a base. Now included with all 3B Scientific Anatomy models is the 3B Smart Anatomy app. This app allows users to register their 3B item to extend the warranty from 3 to 5 years plus free 1 year access to the 3B Smart Anatomy app which includes 23 Anatomy lectures, 117 interactive models and 39 quizzes.