Which musculoskeletal injury would pose the greatest threat to a patient's life?

• A. Nondisplaced long bone fractures
• B. Bilateral femur fractures
• C. Pelvic fracture with hypotension
• D. An amputated extremity

Answer: (C)

Massive internal hemorrhage driving shock is the greatest life threat among these injuries. A pelvic fracture with hypotension signals substantial bleeding into the retroperitoneal space and pelvic vessels, which can deteriorate rapidly and be difficult to control. The pelvis can hide a large volume of blood loss, so hypotension here means ongoing, life-threatening hemorrhage that requires urgent stabilization and rapid hemorrhage control.

By comparison, a nondisplaced long-bone fracture typically causes little bleeding and is usually not immediately life-threatening. Bilateral femur fractures can bleed substantially, but their blood loss is generally less catastrophic than pelvic bleeding. An amputated extremity can cause severe bleeding, but with prompt tourniquet use and hemorrhage control, it is less likely to cause rapid death than the hidden pelvic hemorrhage associated with a pelvic fracture and hypotension.