If the patient has deformation of the leg, it may be caused by the following reasons: 1. Due to the existence of some epiphyseal destruction. For example, if the patient has damage near the joints, it may lead to epiphyseal destruction. At this time, it will lead to unbalanced development of the lower limb bones, which will cause deformation of the lower limbs.2. It may be caused by serious lower limb injuries. For example, in the lower limb there are some serious joint dislocation or fracture, in the process of its recovery, may be complicated by some lower limb bone deformity.3, this situation may be due to congenital hereditary factors. For example, due to genetic reasons, patients may produce some X-shaped legs, O-shaped legs and other changes in appearance. 4, may also be due to excessive exercise, or often carry out large weight bearing.