The clinical observation was performed on 27 patients of acetabular fracture, who had been admitted and treated at Department of Orthopedic Surgery, Choong-ahng Gil Hospital from January 1983 to December 1986. The results obtained were as follows. 1. The prevalent age ranged from 20 to 50 years, and the ratio between males and females was 2.4:1. 2. The most common cause of injury was traffic accident. 3. According to Letournel's classification, 8 cases were posterior wall fractures, 4 cases were pure transverse fractures, 3 cases were “T” shaped fractures, and 3 cases were fractures of both column. 4. The most common associated injury of the another part of the body was pelvic bone fracture and the most common associated soft tissue injury was cerebral contusion. 5. The satisfactory result of conservative treatment was 84.6% and surgical treatment was 78.6%. 6. The complications were degenerative arthritis(66.7%), bed sore(13.3%), ectopic ossification(6.7%), sciatic nerve palsy(6.7%), pin tract infection(6.7%) respectively. 7. The accurate anatomical reduction & rigid fixation was an important factor for intraarticular fracture.