The main danger of developmental hip dysplasia is that it can lead to subluxation or total dislocation of the hip joint, which can cause claudication and even osteoarthritis causing pain, and can seriously affect the quality of life of the patient. In order to avoid other adverse effects of hip dislocation, timely surgical intervention is recommended to improve the acetabular index of the hip joint, increase the coverage of the femoral head and avoid subluxation and dislocation of the femoral head.