High-energy pelvic trauma, with posterior pelvic disruption, produces high morbidity and mortality rates. Part of the initial resuscitation has included an anterior external fixator to close the pelvic ring, thereby decreasing blood loss and reducing mortality. However, this technique has been found to be less efficacious in certain situations. This has stimulated an interest in alternative methods of stabilization, which has led to the recent development of the emergency pelvic "C" clamp. We present one of the potential pitfalls of this new device, discuss pertinent clinical and biomechanical studies, and offer suggestions regarding its use.