• K Knobloch, S Wagner, C Haasper, C Probst, C Krettek, P M Vogt, D Otte, and M Richter.
• Trauma Department, Medical School Hannover, Germany. kknobi@yahoo.com
• Injury. 2008 Jan 1; 39 (1): 36-43.

IntroductionSternal fractures are a rare entity. We hypothesised that a sternal fracture is an indicator of injury severity following traffic accidents.MethodsAnalysis of technical indicators of the collision, preclinical and clinical data of patients with sternal fractures from 1985 to 2004 among 42,055 injured patients assessed by an Accident Research Unit.ResultsOnly 267/42,055 patients (0.64%) suffered a sternal fracture within the 20-year period. Soft tissue bruises are most often concomitant injuries (55%), followed by cervical spine injuries (23%), multiple rib fractures (14%) and lung injuries (12%). Eighteen percent of patients were polytraumatised, with 11.2% dying at the scene, 2.3% in hospital. Deceleration velocity (DeltaV) was significantly correlated with injury severity score (ISS, r2=0.92, y=0.408x-4.1573) as with maximal abbreviated injury scale (MAIS, r2=0.81). Patients suffering a sternal fracture being polytraumatised had significantly higher deceleration velocity (60+/-17km/h versus 37+/-16km/h [37.3+/-10.6mph versus 23+/-9.9mph], p=0.0001). Patients dying with a sternal fracture had a significant higher deceleration velocity (61km/h, 37.9mph) versus those surviving (38km/h, 23.6mph, p=0.0001). Regarding the vehicle type, the majority occurred after car accidents in 0.81% (251/31,183 patients), followed by 0.19% (5/2633 patients) driving motorbikes, and 0.11% (4/3258 patients) driving a truck. Only 13% of all passengers suffering a sternal fracture had an airbag on board (33/255 car/trucks), with an airbag malfunction in 18%. 22% were not admitted to hospital, 28% were admitted to a trauma ICU with a sternal fracture.ConclusionIn 1/5 of cases sternal fractures encountered in polytraumatised patients following significantly higher deceleration velocities during the crash. Typically car drivers without a functioning airbag suffer a sternal fracture.

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