Displaced acetabular fractures are serious injures which require prolonged treatment and often result in some degree of permanent disability. In the past, because of the complicated anatomy of the region, frequent associated injuries and difficulties of the exposure and reduction, the treatment of complex fractures of the acetabulum remained controversial. The aim of treatment must be the restoration of hip function which require accurate anatomical reduction and firm fixation followed by early exercise. Therefore, surgical management is often required to achieve the accurate anatomical reduction of fractured acetabulum. The open reduction and internal fixation was performed on 20 patients with acetabular fractures who had been admitted and treated at Department of Orthopedic Surgery, College of Medicine, Dong-A University from March 1990 to December 1991. The clinical results of 14 patients who were followed by 1 year period were as follows. 1. According to Letournel's classification, the most common type of elementary fractures was posterior wall(42.9%) and among the 5 cases of associated fractures, both column fractures were 14.3% and transverse fracture and posterior wall fractures were 14.3%. 2. All 5 cases of the osteotomy of the trochanter healed uneventfully, with no evidence o'f migration of the trochanter. 3. According to Goodwin assessment, excellent to good results were obtained in 78.9%. 4. Postoperative complications were traumatic arthritis (2 cases), deep soft tissue infection (1 cases), ectopic ossification (1 cases), sciatic nerve palsy (1 case) and metal failure (1 case). 5. Surgical treatment in acetabular fractures, with an anatomical reduction and rigid fixation followed by early joint motion improved the results and decreased the rate of complications such as traumatic arthritis.