Many patients are very concerned about the long-term results after periacetabular osteotomy, especially “whether joint replacement can be avoided”. There are many reasons why joint replacement is necessary, and a small percentage of normal people need joint replacement as they age and their joints wear out. In patients with hip dysplasia, the weight-bearing surface of the acetabulum is narrower, which results in higher local stress and faster wear during activity. Most patients already have hip pain at the time of consultation, and after careful examination, more obvious cartilage damage and glenoid labral damage are found. After periacetabular osteotomy, only the position of the weight-bearing surface can be adjusted, which cannot increase the development of the acetabulum or increase the area of good cartilage, nor can the already damaged cartilage be completely repaired. As a result, postoperative joint wear is still ongoing, but at a significantly slower rate. Therefore, there is no guarantee that the joint will still function well 30-40 years after the osteotomy. The available data show that after periacetabular osteotomy, 90% of patients can use the joint for more than 10 years, and more than 60% of patients can use it normally for more than 20 years. With the improvement of surgical techniques, the reduction of complications, the proper rehabilitation and exercise measures, and the availability of patient care and maintenance measures, it is certain that more and more postoperative patients do not need joint replacement.