Which fracture has the greatest potential for internal blood loss and shock?

• A. Skull fracture
• B. Pelvis fracture
• C. Clavicle fracture
• D. Femur fracture

Answer: (B)

Massive internal blood loss and shock are most likely with injuries that involve a large, richly vascular compartment. The pelvis houses major arteries and venous networks, and when the pelvic ring is disrupted, blood can be released into the retroperitoneal and pelvic spaces. This bleeding is often hidden from view and can be enormous, rapidly reducing circulating blood volume and perfusion, which leads to hemorrhagic shock.

In comparison, bleeding from a skull fracture tends to stay within the skull, which is dangerous but doesn’t usually cause as rapid a drop in systemic blood volume. A clavicle fracture may bleed, but typically not enough to produce shock. A femur fracture can cause significant blood loss due to the marrow and surrounding vessels, but the pelvis has a larger potential reservoir for blood loss, making it the highest risk for rapid internal hemorrhage and shock.