Which single projection is commonly used to screen the pelvis in trauma?

• A. Lateral pelvis
• B. AP pelvis
• C. Upright chest radiograph
• D. AP lumbar spine

Answer: (B)

In trauma imaging, the best single view to screen the pelvis is the AP pelvis projection because it provides the broadest overview of the entire pelvic ring, both acetabula, and proximal femora in one exposure. The supine AP view is quick, easy to perform, and requires minimal patient manipulation, which is crucial when time is critical and the patient may be unstable. This view reliably reveals many common pelvic fractures and dislocations, allowing rapid assessment and decision-making.

Other options don’t offer the same comprehensive single-view screening. A lateral pelvis focuses on posterior structures but doesn’t depict the entire ring as effectively in one image. An upright chest radiograph looks at the chest, not the pelvis. An AP lumbar spine image targets the lower spine rather than the pelvic ring. So the AP pelvis serves as the standard initial screen for pelvic trauma.