In Lewis v. Workmen's Compensation Appeal Board (Pittsburgh Board of Education), 508 Pa. 360, 498 A.2d 800 (1985), the medical witness was found equivocal in part because he assumed that the injury was caused by a work incident. In that case, the claimant had pre-existing neck problems from a football injury. He alleged that he incurred a work-related injury while moving furniture. He did not go to the hospital until nine days after the injury and then underwent surgery. To establish that the injury was work-related, the claimant's doctor testified that the work incident could have been directly or indirectly the cause of claimant's condition. He then read from a report he prepared in which he stated that the claimant's symptoms could have been aggravated simply through the normal aging process or through repeated trauma to the neck incurred in football coaching.