Help the knee joint to restore the original function or functional exercise during the rehabilitation period; the high-strength military aluminum alloy bracket has good extensibility and can be adjusted according to personal needs; the four-point principle can fix the knee joint instability caused by osteoarthritis, thereby stabilizing the knee Joints; the adjustable chucks on both sides can be moved freely from 0°-120°, adjust and fix the angle within the range of 0°-90°.