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The radiograph is underpenetrated, but one can still see widening of the symphysis pubis and of the left sacroiliac joint. This is compatible with a pelvic ring injury and CT of the pelvis is the next step to look for any other fractures that may not be visible on the radiograph. The CT revealed an additional right sacral fracture, difficult or impossible to see on the radiograph.
The CT is also useful to look for pelvic visceral or arterial injury (e.g. the left superior gluteal artery).