Bent legs are most commonly seen in inversion of the knee and can be corrected through exercise, physical therapy, and surgery. Bent legs can be caused by congenital or acquired factors, congenital factors such as dysplasia, etc., and acquired factors such as malnutrition in early childhood. If the deformity is mild, it can be evaluated under the guidance of a doctor, and the lower limb force line can be corrected through exercise, or plaster immobilization and orthopedic shoes, etc., and the earlier the treatment is corrected the better the recovery effect. If it is difficult to correct the deformity because of the age or the seriousness of the deformity, it can be treated by surgery, such as osteotomy. It is recommended to consult a regular hospital and follow the doctor’s instructions.