Leading cause of death in pelvic injury is BLEEDING!
Venous haemorrhage is thought to account for nearly 90% of pelvic fractures and arterial haemorrhage only 10%5. True pelvic volume is about 1.5L but this volume increases with disruption of the pelvic ring. Haemorrhage from a pelvic fracture is essentially bleeding into a free space, which is capable of accommodating the patient’s entire blood volume without exerting a tamponade effect. Blood can escape into the peritoneum, thighs and retro-peritoneal space which can accumulate 5L in volume with only a pressure rise of 30mmHg5.
Learning bite
Nearly 90% of pelvic fracture bleeding is venous in origin.