Key Benefits Sulcus Design: New articular geometry provides increased tibio-talar stability Talar Fixation: Additional talar dome “pegs” provide additional fixation in the talus Comprehensive Sizing: Longer tibial tray sizing options to ensure optimum cortical coverage Refined Instrumentation: All-inclusive set of trial components to allow accurate size determination and anatomic component placement The human ankle is a joint that acts much like a hinge. The joint is formed by the union of three bones. The ankle bone is the talus. The top of the talus fits inside a socket that is formed by the lower end of the tibia, often called the shinbone, and the fibula, the small bone of the lower leg. The bottom of the talus sits on the heel bone, called the calcaneus. As one of the most flexible, free-moving joints in the body, the normal ankle can move forwards, from side-toside, and twist. Like other free-moving joints, the ankle contains cartilage which absorbs shock. It is held together with ligaments – straps of tough tissue, which help prevent the joint from dislocating. Full function of the ankle joint depends on the successful coordination of many interrelated parts including bones, muscles, tendons, ligaments, and nerves. In patients with arthritis, one of the most common reasons for ankle replacement surgery, the cartilage in the joint has worn down, resulting in bone-on-bone contact, causing pain and limited activity