Fig. 1

51-year-old male with Tile type B2 pelvic fracture. A: Lateral radiograph shows the nail placement point at the posterior edge of the spinal canal; B: transverse CT shows that the nail placement point was displaced from the anterior to the posterior edge of the spinal canal and was tilted forward by about 35°. C: Coronal CT shows that the screw was oriented perpendicular to the sacral fracture line and located anteriorly about 0.5 cm from the anterior edge of the S1 vertebral body