Figures 14-16. (14) Pelvic fracture in a 15-year-old boy who was struck by an automobile. Volume-rendered spiral CT image (superior view of left anterior oblique projection) shows the extent of an acetabular fracture (arrow), which was surgically repaired. (15a) Volume-rendered spiral CT image (angled inlet view) shows the extent of a right acetabular fracture (arrows). (15b) Edited right posterior oblique volume-rendered spiral CT image best shows the orientation of the fracture lines and the acetabulum. (16) Pelvic fracture with an intraar-ticular fragment in a 15-year-old boy who was struck by a bus. Inferior volume-rendered spiral CT image shows a posterior acetabular fracture (curved arrow). An intraarticular bone fragment is seen (straight arrow); this fragment was a result of the initial injury, which was a posterior fracture with dislocation.