Extraordinarily Normal. The Kinterra™ Foot/Ankle System combines hydraulics and carbon fiber technology to provide low to moderate impact K3 ambulators an exceptionally normal walking gait regardless of surface angle or speed. The result is rock solid stability and the confidence for users to choose a new path. Kinterras articulating ankle delivers Increased ground contact and a more symmetrical gait Improved stability and safety, especially on slopes and varied terrain Reduced socket pressures for healthier residual limbs Enhanced comfort while sitting and squatting