Thirty-one posterior fracture-dislocations of hip with fracture of acetabulum were followed from 6 months to 84 months(average, 23.3 months). The patientsages ranged from 19 to 58 years(average, 35.4 years). All had primary attempt at closed reduction with subsequent open reduction. Satisfactory results were obtained in 87% of all patients. Complications included partial sciatic nerve palsy(1 case), myositis ossificans(2 cases), osteoarthritis(3 case), recurrent dislocation(1 case) and infections(2 cases).