The National Association of Emergency Medical Service Physicians reminds us that femur fractures rarely cause enough blood loss to cause hemodynamic instability (look for other sources), often have concomitant injuries in the pelvis or distal extremity, and can be effectively splinted either static or with traction (which has contraindications, complications, and technical hurdles).
References
John W. Lyng, Joshua G. Corsa, Philip S. Nawrocki, Brad D. Raetzke, Josh
