Boys X-shaped legs can be improved by exercising local muscle groups, elastic band correction, surgical treatment. X-shaped legs in medicine is called knee valgus, refers to the standing, the knee can be together, but the inside of the ankle joint can not be together, and the distance between the phenomenon of more than 9cm, if you improve the femur internal rotation, exercise the thigh contraction muscle groups, you can improve the leg shape to a certain extent. 1. Exercise local muscle groups: you can improve the leg shape by exercising the thigh contraction muscle groups, get down with the arm support, one leg straight, one leg bent so that the inner thigh pressure on the foam roller, rolling to relax the thigh contraction muscle groups, improve the leg shape. 2. Elastic band correction: the use of elastic band to pull the external rotation of the hip joint, to improve the problem of internal rotation of the femur, and then improve the leg shape. 3. Surgical treatment: If the leg shape is extremely incorrect and affects the patient’s normal life, the X-shaped leg can be corrected by temporarily blocking the epiphysis with a figure-of-eight steel plate. If you feel severe pain during the correction process, you should stop the correction immediately. Boys with X-shaped legs are advised to go to the hospital for examination and take corrective treatment measures according to the doctor’s advice.