The main cause of pain in the hip joint is inadequate coverage of the femoral head by the acetabulum, causing an imbalance within the hip joint pressure and wear of the articular cartilage. The periacetabular osteotomy is a procedure designed by Professor Ganz, former chairman of the European Orthopaedic Society’s Arthrology Group, to address this situation. As shown in the diagram, this procedure loosens the acetabulum through a periacetabular osteotomy. The acetabulum is then rotated outward and forward to loosen the acetabulum, changing its orientation and improving its coverage of the femoral head. The goal is to reduce wear and tear on the joint and to relieve pain. The procedure allows patients to use their own joints as much as possible with hip preservation therapy and postpone the replacement of artificial joints as much as possible. Since 1997, Professor Zhang Hong of our department has been the first to carry out periacetabular osteotomy for adult hip dysplasia in China. More than 1,000 surgeries have been completed, which has greatly improved the survival quality of patients and brought them good news. The picture below shows a patient with bilateral hip dysplasia, with the more symptomatic side done first. The same patient, whose symptoms improved significantly after surgery, had the nail removed from the operated side 1 year later and the opposite side was operated on. How to follow DDH Hip Deeply: WeChat add friend-look for public number-DDH or Hip Deeply.