Since the use of the Charnley hip prosthesis, the component loosening has been the most cause of failure. The roentgenographic appearance of the bone cement junction in total hip arthroplasties has recevied frequent attention. The incidence of loosening as a mode of clinical failure is consistently much lower than the incidence of radiolucent lines. One study shows aseptic loosening of the acetabulum component necessitating revision occurred in 6 percent of all 322 acetabular component, while 2 percent of all 322 femoral component. The present investigation was an attempt to compare observations on plain radiographs with those made during the exchange operation in a series of total hip arthroplasties revised for various reasons. In a series of 29 patients, 30 cases who have admitted for revision at Seoul Paik Hospital from March 1992 to March 1994 by late loosening after being performed cemented total hip athropasty were studies about the radiographic analysis, correlation of the real and radiographic measurement of cement and bone contact. The Result as follows; 1. The mean age at revision was 56 years old and the average time to revision was 12.3 years.