Applies to all kinds of ligament injury, and can inhibit the front of the tibia to shake the symptoms, to assist in the reconstruction of ligaments, and to reduce the weight of the joint load. Commonly used in the rehabilitation of knee joint surgery. On the side of the side of the knee hinge shaft and the inner side of the supporting high quality sponge cushion, effectively reduce the friction and collision of the event. Special joint positioning design, according to the doctor's prescription, each with 10 degrees of curvature or increase, so that the knee joint in the range of 0 degrees -120 degrees of freedom of movement or fixed at a specific angle of bending.