Computed tomography (CT) is helpful in delineating the extent and configuration of fractures of the acetabulum. These injuries are frequently complex, and the precise pathological anatomy is not easily demonstrated by conventional radiographs. In some cases CT will reveal a fracture which may not be seen on the radiograph. In addition, the extent of soft-tissue damage and joint involvement is precisely demonstrated with CT. Five [human] cases are presented to illustrate the value of CT in acetabular fractures.