PURPOSE: We reviewed 47 cases of acetabular fractures which was treated operatively, to review the clinical results of operative treatment of acetabular fractures considering the experience of a surgeon, to assess the relationship between the quality of the operative reduction and the clinical results. MATERIALS AND METHODS: We reviewed 47 cases of acetabular fractures which was treated operatively from September 1993 to December 1999 and follow up more than 1 year. And we analyzed retrospectively the data in the aspect of the relationships between the radiologic evaluation of the reduction and the clinical results, and we reviewed the initial 20 cases as a group I and the later 27 cases as a group II to compare the differences of clinical results of the two groups. RESULTS: In the accuracy of reduction, anatomical reductions were 4 hips in the group I and 13 in the group II, satisfactory 7 hips in the group I and 9 hips in the group II, unsatisfactory 9 hips in the group I and 5 hips in the group II. We assess the over-all clinical result with the criteria of Merle d'Aubigne and Postel. In the group I, 20 hips, the clinical result was excellent for 3 hips(15%), good for 6 hips(30%), fair for 5 hips(25%), and poor for 6(30%) hips. In the group II, 27 hips, the clinical result was excellent for 11 hips(41%), good for 8 hips(30%), fair for 5 hips(18%), and poor for 3(11%). CONCLUSION: The accuracy of reduction was closely related to the clinical results. And the more a surgeon getting experienced, the better accurate reduction and clinical results were possible.