PURPOSE: To review the clinical and radiographic results of operative treatment of acetabular fractures for which there were minimum five-year follow-up. MATERIALS AND METHODS: We reviewed 22 acetabular fracture cases that had been treated operatively from March 1993 to July 1996. Each of the patients had been followed for a minimum five-year. The radiographic results were classified by Matta 's criteria and the clinical results were analyzed according to d 'Aubigne and Postel 's criteria. RESULTS: Satisfactory reduction were obtained in 18 hips (81.8%), 14 and 13 hips of which were included in good or excellent categories of roentgenographic and clinical results respectively. Overall radiographic results for 17 hips (77.3%) at the one-year follow-up and 14 hips (63.6%) at the minimum five-year follow-up were excellent or good. According to clinical criteria, 16 hips (72.7%) at the one-year follow-up and 13 hips (59.1%) at the minimum five-year follow-up were classified as excellent or good. CONCLUSION: Folow-up roentgenographic and clinical results were good or excellent in satisfactory reduction group. Threrefore the accuracy of reduction is an important prognostic factor in acetabular fracture. The results were worse at the minimum five-year follow-up than at the one-year follow-up. Late-postoperative complication is expected to increase as time passes.