Crooked leg growth is usually caused by long bone deformity or knee deformity, which can be treated by reset and fixation, knee arthroplasty and so on. 1. Long bone deformity: due to genetic factors, femur, tibia and fibula fracture, deformed healing after fracture, or bone tumors and other factors can lead to long bone deformity and crooked leg growth. The treatment can be restored through plaster external fixation, corrective osteotomy or cut and reposition internal fixation. 2. Knee deformity: due to maldevelopment or disease and other factors can cause knee deformity such as knee valgus, knee inversion and other knee deformities, resulting in leg curvature, less severe symptoms can be corrected through the fixed support, or use of knee replacement surgery and other treatment. Patients with obvious leg deformity need to go to the hospital for appropriate examination before they can get an effective treatment plan. If you need to use medication, please consult your doctor first.