Patients who develop O-leg or X-leg can be clinically diagnosed with internal and external knee valgus. When a patient has an internal or external knee, the specific treatment depends on the age of the patient and the degree of internal and external knee. For example, in children with O-leg or X-leg, most of the treatment is conservative, using traditional Chinese medicine techniques to correct the problem and then wearing orthopedic braces for a long time to fix it. In adults with O-leg or X-leg with a large deformity, the treatment is surgical, which is performed under epidural anesthesia; for O-leg, a wedge osteotomy is performed on the proximal tibia, followed by fixation with an orthopedic brace; for X-leg, a wedge osteotomy is performed on the distal femur, which also requires an orthopedic brace.