Questions of causation relating to the degree of permanent impairment resulting from an injury, including whether the impairment was caused by the workplace incident, fall within the exclusive jurisdiction of approved medical specialists and Appeal Panels under Part 7 of Chapter 7 of the WIM Act, not arbitrators. A consent determination recording that a worker 'suffered injury' on a particular date does not, without more, constitute a determination that the injury involved an exacerbation of a pre-existing condition. Where there is a frank trauma injury that may also have aggravated a pre-existing disease, the aggravation is part of the pathology of the s 4(a) injury and s 16 does not apply.
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