The treatment of hip dysplasia is divided into two main categories: non-surgical and surgical treatment. The choice of treatment method is related to various factors such as the age of the child, pathology and whether the child is walking and weight-bearing. I. Non-surgical treatment: mostly for children younger than 18 months of age. 1, Pavlik sling (Figure 3-1) or Tübingen hip flexion orthosis: Pavlik sling or Tübingen hip flexion orthosis treatment is the most widely used method in conservative treatment. This method is mainly suitable for the treatment of DDH under 6 months of age. It usually takes 3-6 months. 2.Traction repositioning: suitable for cases under 6 months, T?nnis III or above dislocation and heavy contracture of the adductor muscle. 3.Manipulative repositioning: suitable for the treatment of infants and children aged 6 months to 18 months. The classical treatment plan includes adequate preoperative traction, release of the adductor muscle and closed resetting. Second, surgical treatment Surgical treatment of hip dysplasia usually involves two aspects: first, incision and repositioning to remove soft tissue structures that prevent repositioning and achieve central repositioning of the femoral head; second, correction of deformity of the acetabulum and proximal femur by means of pelvic and femoral osteotomy.