
Events that lead to injuries have traditionally been thought of as "accidents" and this term is still commonly used.
A paradigm shift occurred in the 1940’s when researchers started to think of injury as a disease that occurs in a susceptible host within a permissive environment, similar to the model for infectious diseases.
The three factors at play are linked through the injury triangle:

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2. Hargarten, J.W.R.a.S.W. (2002). Principles of the Disease of Injury. Rosen's Emergency Medicine. J.A. Marx. St. Louis, Missouri, Mosby Inc. 1:821-828.