Multiple Trauma: Multiple physical insults or injuries occurring simultaneously.Injury Severity Score: An anatomic severity scale based on the Abbreviated Injury Scale (AIS) and developed specifically to score multiple traumatic injuries. It has been used as a predictor of mortality.Wounds, Nonpenetrating: Injuries caused by impact with a blunt object where there is no penetration of the skin.Hemoperitoneum: Accumulations of blood in the PERITONEAL CAVITY due to internal HEMORRHAGE.Thoracic Injuries: General or unspecified injuries to the chest area.Abdominal Injuries: General or unspecified injuries involving organs in the abdominal cavity.Equipment Safety: Freedom of equipment from actual or potential hazards.Femoral Fractures: Fractures of the femur.Multiple Organ Failure: A progressive condition usually characterized by combined failure of several organs such as the lungs, liver, kidney, along with some clotting mechanisms, usually postinjury or postoperative.Wounds and Injuries: Damage inflicted on the body as the direct or indirect result of an external force, with or without disruption of structural continuity.Vena Cava Filters: Mechanical devices inserted in the inferior vena cava that prevent the migration of blood clots from deep venous thrombosis of the leg.Critical Care: Health care provided to a critically ill patient during a medical emergency or crisis.Trauma Centers: Specialized hospital facilities which provide diagnostic and therapeutic services for trauma patients.Intensive Care Units: Hospital units providing continuous surveillance and care to acutely ill patients.Retrospective Studies: Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.Prospective Studies: Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.