髋臼假体移位至盆腔（The acetabular prosthesis was displaced to the pelvic cavity）

患者老年女性，类风湿性关节炎，骨质疏松，双侧全髋术后，髋臼假体移位至盆腔多年，不能行走。（The patient is an elderly female with rheumatoid arthritis and osteoporosis. After bilateral total hip surgery, the acetabular prosthesis has been displaced into the pelvic cavity for many years and she is unable to walk.）