The Circleg Polycentric Knee’s unique design provides the high stability required by low-mobility users and meets the demands of active users. It provides a high level of stability at heel strike and additional ground clearance during the swing phase. It includes an extension assist spring and a flexion damper to optimize energy consumption and gait cycle. The knee allows for flexion of up to 150°. The mechanism is protected from dust and dirt by a knee cap, which also creates an aesthetic natural shape when in a sitting position.