From a research point of view, once injury occurs, the causes of that injury -personal involvement, environmental factors and chance -should be studied.Chance can be the one thing that makes life worth living.It is the root of all biological and physical evolution, the chance impacts of atomic and subatomic particles, the chance meeting of human beings, the chance of fertilisation in reproduction and the chance of injury.In any one week each of us has about a 1 in 8000 chance of being injured.It is still 8000 to 1 against for the following week, so that there is no immunity as far as chance is concerned.
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Vincent C. Thomas (1977) studied this question.