Adolescent acetabular dysplasia is often an important causative factor for secondary hip arthritis in adults. The main lesions are shallow flat acetabulum, tilt, poor anterolateral and lateral flap of the femoral head, and external upward displacement of the center of rotation of the femoral head, which results in subluxation or total dislocation of the femoral head; This method is suitable for young patients, who are young, indicating that often their onset will not be too long. Moreover, the regenerative capacity of articular cartilage is better in young patients, and cartilage wear is not severe (good joint gaps) recovery is faster. The femoral head and acetabulum were well matched after surgery. The patient’s posterior pelvic ring is intact, none of the physiological structures are changed, the pelvis is stable, and it does not affect female pregnancy as well as childbirth. And the joint is still its own joint, and the hip joint also regains its original function quickly on the basis of the reset. In conclusion, the Bernese periacetabular osteotomy can prevent and delay the occurrence of osteoarthritis and avoid or delay the possibility of joint replacement because it can effectively improve the acetabular coverage and increase the weight-bearing joint surface, while shifting the center of rotation of the hip joint inward and reducing the cartilage stress.