Developmental hip dislocation is one of the more common congenital malformations in pediatric patients. It is more common in posterior dislocation and exists at birth, more in females than males, about 6:1, twice as many on the left side than on the right side, and less in bilateral cases. It is mainly due to congenital dysplasia or abnormalities of the acetabulum, femoral head, joint capsule, ligaments and nearby muscles, resulting in joint laxity, subluxation or dislocation. In addition, the abnormal position of the fetus in the womb and excessive flexion of the hip joint also predispose to the disease, and genetic factors are also more obvious. Developmental hip dislocation is one of the more common congenital anomalies in children. It is more common in later dislocation and exists at birth, more in females than males, about 6:1, more on the left than on the right, and less in bilateral cases. It is mainly due to congenital dysplasia or abnormalities of the acetabulum, femoral head, joint capsule, ligaments and nearby muscles, resulting in joint laxity, subluxation or dislocation. In addition, the abnormal position of the fetus in the womb and hyperflexion of the hip joint also predispose to the disease, and genetic factors are also more obvious. Early treatment is emphasized, and treatment is best in infancy and early childhood; the older the age, the worse the effect. It is generally believed that surgery is needed more often after 2-3 years of age, so the emphasis is on neonatal screening and timely diagnosis and treatment to obtain a cure. The key to the prognosis of this disease is early diagnosis. The earlier the treatment, the better the results. As the age increases, the more severe the pathological changes, the worse the treatment effect. In addition, hip dysplasia without dislocation should be treated promptly. Epidemiological studies have shown that about 40-60% of acetabular dysplasia develop hip pain in middle age and ultimate lesions such as hip osteoarthritis and femoral head necrosis occur and the joint is replaced. Up to 6 months, the PEVLIK sling method is used. At 8-9 weeks after birth, the hip joint is found to be subluxed or dislocated, and a sling with stirrups may be used for 6-9 months. Only the extension activity of the hip joint is restricted, and all other activities are unrestricted. The majority of children can be treated with repositioning and no aseptic necrosis of the femoral head occurs, except for a few cases where there are factors in the hip joint that prevent repositioning. The dressing sleeve method and the abduction as a swaddling support method are also used to maintain the hip for more than 4 months. 6-18 months: For some children with mild disease, they can still be treated with a sling support. If it cannot be repositioned after 4-6 weeks of use, it can be repositioned by manipulation or open cast fixation method. Method of revision: Under general anesthesia, the child is placed in the supine position with the hip and knee joint on the affected side flexed by 90° each, and traction is applied in the direction of the long axis of the thigh, while the greater trochanter is compressed so that the femoral head is incorporated into the acetabulum. After reaching the correction, because the frog cast tends to affect the development of the femoral head and produce ischemic changes, the frog cast is no longer used in domestic and foreign pediatric surgery and is replaced by the “herringbone cast”, which means that the hip joint is only abducted about 80°, the knee joint is slightly flexed, and the child is allowed to step on the ground with the cast after it is put on. More than 18 months: At this time, the degree of dislocation is aggravated, and the secondary changes of bone and soft tissue are more serious, so it is difficult to succeed in manual rehabilitation, and surgery should be used. Surgery can be done simply by open repositioning, intracapsular cleaning and release, and joint capsule tightening. For abnormal acetabular index, a SALTER pelvic osteotomy is feasible, and for children over 5 years of age or if the acetabular index is greater than 45°, a PEMBERTON osteotomy should be performed. Depending on the angle of anterior tilt and the degree of dislocation, a rotational inversion shortening osteotomy of the femur is performed. Adolescents over 14 years of age and adults: PAO surgery is an excellent surgical option, and CHIARI surgery can be used as a salvage procedure in units where PAO surgery cannot be performed.