In this design, which includes several parts, and in the clip, we are talking about how to assemble all the parts. The mechanism of this knee brace depends only on the central gears and brass buttons that adjust the opening and closing angles of this knee brace. Each of the buttons is set for a type of angle that helps patients who have undergone knee surgery by adjusting the movement angles of their knee and the doctor's order to relieve pain and correct the knee closing angle.