O-shaped (type) leg calf ectropion can be corrected differently according to the age of the patient, and the common methods are wearing a brace, medication, surgery and so on. 1. Infancy and childhood: O-shaped leg is common in pediatric rickets, can wear orthopedic knee brace, supplement calcium and vitamin D, such as calcium carbonate D3 tablets, and more sunshine. 2. Adolescents: before the epiphysis is closed, the epiphysis around the knee joint is blocked and the corresponding internal fixation is carried out to slow down the growth and improve the O-shaped leg, and the deformity will be corrected in the later growth and development. 3. Serious condition or older age: surgical correction is needed. U-shaped osteotomy can be performed on the middle and upper end of the tibia, together with the corresponding internal fixation, to improve the O-shaped leg calf valgus, and joint replacement can also be performed. Diagnosed with O-shaped leg, it is recommended that early standardized treatment in order to reduce the adverse effects of the disease. The above medication is recommended under the guidance of a doctor.