The external eight legs, also known as knee valgus, X-shaped legs, different age correction methods are different, as follows: 1, children stage: because the bones have not yet developed, ligament flexibility, generally can be leg binding action to correct the external eight, can also be carried out around the knee ligament massage, and then the force of the method to break the correction method, the younger the age, the better the effect of correction; 2, adults: the bones The younger the person, the better the result; 2. Adults: the bones have matured and the ligaments have stiffened, so osteotomy orthopedics should be performed to correct the force line of the lower limb by osteotomy of the distal femur or osteotomy of the proximal tibia to correct the valgus knee; 3. Elderly people: the valgus knee is mostly caused by joint degeneration, so total knee replacement surgery can be performed to correct the valgus leg.