O-shaped leg, i.e. knee inversion, is externally rotated and can be caused by genetics, early standing, malnutrition and lack of exercise, etc. Usually the younger the age, the better the result of intervention. 1. The treatment plan of surgical correction is to carry out external fixator correction after osteotomy, such as external fixator plus tibial tuberosity inverted U-shaped osteotomy, this method has better effect, which can make the bone healing angle accurate, easy to adjust the angle and so on in time, and it can carry out the postoperative activities in time, and can carry out the functional exercise in time. 2. The equipment correction has the correction program of splinting and leg binding, which is simple and easy to carry out, does not need to perform surgery and is inexpensive, without surgical risk, but it needs to persist in the treatment for a long time in order to achieve the effect, and can be combined with orthopedic insoles to prevent poor posture and aggravation of the condition. When you find O-shaped legs, please consult a doctor in time to avoid delaying your condition.