How can acetabular dysplasia be treated early in adulthood? Acetabular dysplasia is a deformity of the hip that occurs when the acetabulum does not develop well. It is also known as acetabular subluxation. The main pathological change is that the acetabulum becomes shallow, resulting in insufficient accommodation and coverage of the femoral head by the acetabulum. As a result of these pathological changes, the mechanical conduction of the hip joint becomes abnormal, which gradually causes damage and degeneration of the articular cartilage and eventually leads to the occurrence of osteoarthritis of the hip joint. Therefore, acetabular dysplasia is a disease with a high disability rate. Since there are no obvious symptoms in the early stage of acetabular dysplasia, it is not easy to diagnose early. However, as time goes on, symptoms will develop around the age of 20 to 40. It is more common in females and initially manifests as soreness and swelling of the hip, which is aggravated after prolonged standing or walking and gets better after rest. Afterwards, hip pain gradually appears, mainly in the root of the thigh and groin area, sometimes accompanied by knee pain. There are also some patients who show mainly knee pain, but knee examination is often normal. There is no significant impairment of hip joint movement in the early stage. The severity of hip pain is somewhat related to the degree and extent of articular cartilage damage. As the disease progresses, hip pain further worsens and hip movement is affected. If the symptoms appear at a younger age, it indicates that the degree of acetabular dysplasia is more severe and the prognosis is worse. If detected early and operated early, it can effectively relieve or even eliminate hip pain, preserve joint function, stop or delay the occurrence and development of osteoarthritis, and can eliminate or postpone the time of artificial joint replacement surgery. There are several surgical methods that can be used for the early treatment of acetabular dysplasia. Our department adopts the method of acetabular rotational osteotomy. The technical principle of this procedure is to correct the deformity of the hip joint, increase the coverage of the femoral head, and change the force load on the hip joint by rotational movement of the entire acetabular joint surface.