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The clinical characteristics of an injury of external iliac artery branches in blunt pelvic trauma have not yet been sufficiently studied. We evaluated the relationship between injury characteristics and the presence of an injury to external iliac artery branches in blunt pelvic trauma.A retrospective review of patients admitted with blunt pelvic trauma was conducted over an 11-year period. Charts were reviewed for age, gender, injury characteristics, injury severity score, length of stay in the intensive care unit, transfusion requirements, and fracture pattern.Of 286 blunt pelvic trauma patients, 90 patients (31%) underwent pelvic angiography. Of those patients, 10 (11%) had the injuries of the branches of external iliac artery and 88 (97%) had the injuries of the branches of internal iliac artery. Those patients with external iliac artery branch injuries were significantly associated with hemodynamic instability, when compared to those without external iliac artery branch injuries. There were no significant differences between the patients with and without external iliac artery branch injury with regard to the anatomical characteristics of pelvic trauma.Blunt pelvic trauma with hemodynamic instability may be associated with concomitant external iliac artery branch injury.