The objective of this study is to evaluate the effect of earlier placement of Circumferential Pelvic Compression (CPC) on resuscitative measures required for life-threatening pelvic ring injuries and to guide the development of future efficacy trials of three advanced resuscitation techniques (surgical pelvic packing, angioembolization, REBOA).

Inclusion Criteria:

• Patient age between 18 and 64 years, inclusive;
• Severe blunt or blast traumatic injury;
• Young-Burgess APC-2 and 3, LC-3, vertical shear, and combined mechanism of injury (CMI) (Tile B and C patterns; OTA codes 61-B and 61-C);
• Circumferential pelvic compression (CPC) device used at any time within 24 hours of injury.
• Patient must speak either English or Spanish

Exclusion Criteria:

• Arrival to hospital of definitive care more than 6 hours after injury;
• Ballistic pelvic injury, other than from a blast mechanism;
• Time of CPC placement not recorded;
• Time of injury and time of EMS dispatch unknown;
• Use of medical anti-shock trousers (MAST);
• Confirmed dead on arrival to hospital

Patients with severe pelvic ring disruptions