Zhang Moumou, female, 57 years old, underwent left total hip surgery in 1974 for old fracture of the left femoral neck, still felt hip pain and shortening of the left lower limb after surgery, and underwent left hip revision surgery in 2000, suddenly developed left hip popping, severe pain and difficulty in movement when walking in April 2008. Diagnosis: post-operative loosening of the prosthesis and femoral bone defect in the left total artificial hip joint. He underwent another total hip replacement surgery with a special extension stem and resumed walking two weeks after the surgery. Pre-operative pelvic radiographs showed loose prosthesis and broken wire Pre-operative frontal and lateral radiographs of the hip joint showed loose prosthesis Post-operative, the revision prosthesis was in good position