The Act does not require that a compensable injury be the sole cause of a disability before compensation is payable. If a disability results from the interaction of multiple causes, it is improper to require that the compensable event or injury be the most significant factor. It is sufficient if the employment or injury was a significant contributing factor, or contributed to a material degree to the disablement (Professor Ison’s Workers’ Compensation in Canada (2nd Edition), at page 58; Athey v. Leonati, 1996 CanLII 183 (SCC), [1996] 3 S.C.R. 458).
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