… it is a long-standing principle of both tort law and workers’ compensation law that the test for causation does not require a single or dominant cause. As long as the work-related cause materially contributed to the injury then it will be compensable: see Athey v. Leonati, 1996 CanLII 183 (SCC), [1996] 3 S.C.R. 458 at paragraph 17; Ison, supra at 58. Thus in cases like this one, the question is whether it is more likely than not (standard of proof) that the physical demands of the job played a role in triggering the aggravation (test for causation).
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