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Anatomic distortion caused by pelvic fracture displacement and hematoma formation may lessen the accuracy of hemoperitoneum detection by four-quadrant focused assessment with sonography in trauma (FAST). Researchers tested this hypothesis in a retrospective cohort of 87 blunt trauma patients (mean age, 42 years; 55% men) who presented to a single trauma center with any one of four major pelvic fracture Tile subtypes: A2, direct injury to innominate bone or anterior pelvic arch (9%); B, rotational unstable pelvic injury (72%); C, completely unstable pelvic ring injuries (16%); and C, acetabular fractures and associated bone column acetabular fractures (3%). All FAST exams were conducted by emergency physicians or surgeons, and the results we…