X-shaped legs at different ages are corrected in different ways, as follows: 1. Conservative treatment: Children less than one year old can be corrected by conservative treatment techniques because of the flexibility and plasticity of the ligaments. By applying daily inward turning force to the knee joint, the lateral spastic support band can be pulled, which makes the lateral collateral ligament relaxed, and then can be well corrected. 2, brace correction: In children over one year old, brace correction of the lower limbs should be performed. 3, osteotomy orthopedic: In the case of young adults with closed epiphysis, osteotomy orthopedic method can be used, through the distal femur osteotomy and proximal tibia 4.Total knee replacement: X-shaped legs caused by degenerative osteoarthritis in the elderly can be corrected by total knee replacement.