Background: Purpose of the presented study is to answer the following questions: Are knee injuries associated\r\nwith trauma mechanisms or concomitant injuries? Do injuries of the knee region aggravate treatment costs or\r\nprolong hospital stay in polytraumatized patients?\r\nMethods: A retrospective analysis including 29.779 severely injured patients (Injury Severity Score [greater than or\r\nequal to] 16) from the Trauma Registry of the German Society for Trauma Surgery database (1993-2008) was\r\nconducted. Patients were subdivided into two groups; the \"Knee\" group (n=3.458, 11.6% of all patients) including all\r\nmultiple trauma patients with knee injuries, and the \"Non Knee\" group (n=26.321) including the remaining patients.\r\nPatients with knee injuries were slightly younger, less often male gender and had a significantly increased ISS.\r\nResults: Patients in the Knee group suffered significantly more traffic accidents compared to the Non Knee group\r\n(82% vs. 52%, p<0.001). These injuries were more often caused by car or motorbike accidents. Severe thoracic and\r\nlimb injuries (AIS[greater than or equal to]3) were more frequently found in the Knee group (p<0.001) while head\r\ninjury was distributed equally. The overall hospital stay, ICU stay, and treatment costs were significantly higher for\r\nthe Knee group (38.1 vs. 25.5 days, 15.2 vs. 11.4 days, 40,116 vs. 25,336 Euro, respectively; all p<0.001).\r\nConclusions: Traffic accidents are associated with an increased incidence of knee injuries than falls or attempted\r\nsuicides. Furthermore, severe injuries of the limbs and chest are more common in polytraumatized patients with\r\nknee injuries. At last, treatment of these patients is prolonged and consequently more expensive.
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