Hip replacement for 45 days on the affected side of the buttocks, feel something may be the replacement of the hip joint and its own joint is not particularly compatible, postoperative adhesion of the surrounding tissues and so on. 1. Hip joints and their own joints do not match: Hip joint replacement is an artificial prosthesis to replace the diseased hip joint, so as to restore the normal function of the hip joint, hip replacement 45 days on the affected side of the buttocks feel something, it may be the replacement of the hip joint and their own joints do not particularly match. 2. Postoperative adhesion of surrounding tissues: Hip replacement surgery is a relatively large operation, in the process of surgery, the surrounding soft tissues will cause some damage, if there is postoperative adhesion of surrounding tissues, the original femoral head and neck-shoulder distance will change, so it will cause some discomfort. After hip replacement surgery, you should pay more attention to rest, and if the symptoms continue to be unrelieved, it is recommended to actively seek medical attention.