The effect of using sitting posture to correct O-leg is not particularly satisfactory. Sitting with a W-shaped leg can only assist in the treatment of patients with O-leg, preventing the development of osteoarthritis of the knee joint or damage to the lateral collateral ligaments of the knee joint that is too severe. This can improve the symptoms of knee pain and limited movement of O-leg patients, and can prevent such symptoms. However, the W-shaped sitting posture cannot correct O-leg, and to correct O-leg, it must be done before the person’s height stops growing, once the height development is completed and the body development is finished, it will be very difficult to correct O-leg. If you are an adolescent in the growth period, you need to use the method of external fixation of leg splint to correct the shape of the leg, so as to gradually correct the deformity of O-shaped leg.