Humeral shaft fractures as predictors of intra-abdominal injury in motor vehicle collision victims.

To assess the utility of humeral shaft fractures as predictors of organ injuries and skeletal injuries in multiply injured patients involved in motor vehicle collisions (MVCs). A prospectively collected database of multiply injured motor vehicle occupants with an Injury Severity Score (ISS) greater than 12 admitted to a level I regional trauma centre during a 102-month period (January 1992 to June 2000) was reviewed to assess skeletal and organ injuries associated with a humeral shaft fracture. The effect of occupant location within the vehicle, the point of collision, and the use of a seat belt restraint was also examined to identify trends in injury patterns. Data from 1070 motor vehicle occupants - 65 with concomitant humeral shaft fractures and 1005 without humeral shaft fractures - revealed that 63% of motor vehicle occupants who sustained humeral fractures were drivers, compared with 77% in the non-humeral fracture group. Those patients who sustained a humeral shaft fracture had a significantly greater number of liver injuries (p = 0.022), forearm/hand fractures (p < 0.001), tibial fractures (p < 0.01) and femoral fractures (p < 0.01) compared with controls. A lateral collision impact showed a trend towards increased splenic and hepatic injuries within the humeral shaft fracture group. The presence of a humeral shaft fracture in a multiply injured patient involved in a MVC is significantly associated with an increased incidence of both upper and lower extremity fractures and liver injury. Moreover, humeral shaft fractures may serve as a predictor of potential intra-abdominal pathology in multiply injured trauma patients involved in MVCs.