Patient: Recently, I had pain at the roots of my thighs on both sides, and I had a radiograph at the hospital saying that it was acetabular dysplasia. Please help me to see if the film is acetabular dysplasia, and if so, how should I treat it. Thank you. The main purpose is to increase the coverage of the acetabulum on the femoral head. For your age, if you have hip pain and the MR shows that the femoral head is not necrotic, you can also consider rotational osteotomy of the acetabulum. If the femoral head is already necrotic, you can only have an artificial hip joint replacement. Patient: Hello, I was previously found to have ankylosing spondylitis, can I have this acetabular rotational osteotomy. Can you postpone the surgery for 1 year on my film? Thank you. Sun Jitong, Department of Orthopedics, 309th PLA Hospital: Ankylosing spondylitis is an autoimmune disease with a mid-axis pathogenesis. In the spine, the damage to the articular cartilage can cause a bamboo waist, or sacroiliac joint damage, and in the large joints, it is mainly the erosion of the articular cartilage, so hip dysplasia and ankylosing spondylitis can both cause hip symptoms, but the mechanisms are different, so, as mentioned above, it is recommended to Check the MRI of the hip joint to understand the condition of the hip cartilage, if the cartilage damage is serious, acetabular osteotomy does not make sense. Patient: Hello, I was previously diagnosed with ankylosing spondylitis, can I have this rotational acetabular osteotomy? Thank you. The symptoms caused by acetabular dysplasia are mainly osteoarthritis of the hip joint and osteonecrosis of the femoral head caused by the abnormal stress between the acetabular roof and the upper limit of the femoral head caused by incomplete coverage of the femoral head by the acetabulum, which appears early after transitional exertion, and then progresses to pain and progressive hip movement disorder after standing and walking. The premise is to check the MRI to see the condition of the femoral head, as mentioned earlier, if the femoral head has been necrotic, the acetabular rotational osteotomy has lost its meaning, and only joint replacement can be chosen.