First rib fracture: A harbinger of severe trauma?

Background: Prior to routine CT scanning, first rib fractures (FRFs) were considered a harbinger of great vessel injuries. We hypothesized FRFs identified on screening CXR have significant associated injuries, while those identified on CT alone do not.

Methods: We reviewed adult blunt thoracic trauma patients 2014-2015 to identify all FRFs and then tabulated demographics, injury characteristics, and outcomes.

Results: Of 429 patients with chest trauma, 56 had a FRF. CXR diagnosed 20% and CT 80%. Those diagnosed on CXR were older (61 vs 48 p = 0.03), had more severe chest trauma (45% vs 13% chest AIS>3, p = 0.029), longer ICU stays (10 vs 4 days, p = 0.046), and risk for intubation (73% vs 27%, p = 0.011). There was only one major vascular injury in each group. Most FRF patients had associated injuries, including 82% with pelvic fractures.

Conclusions: Widespread use of CT scanning has resulted in a 5-fold increase in FRF diagnoses. While vascular injuries are not common, especially when identified on initial CXR, FRFs correlate with morbidity and associated injuries.