NFL downplays 49ers electrical substation injury link

A theory has emerged in recent weeks regarding the perceived uptick in 49ers' injuries and the proximity of their practice field to an electrical substation. The issue was raised on Friday morning, through a question presented during an NFL player health and safety media briefing.The topic was addressed by Dr. Allen Sills, the NFL's Chief Medical Officer."Obviously, we're aware of those reports," Dr. Sills said. "Listen, I would say we look at injury causation across the board. We consult with experts throughout sports medicine and other industries to try to understand and gain as comprehensive an understanding of injury causation as we can. "I would tell you that I'm not familiar with anything in the sports medicine literature that supports those associations, but I would also tell you that injury causation is really complex. If you think about biology and medicine, you don't have usually one single factor that drives biological systems. And so when we think about injury causation, whether it's lower extremity strains or ACL or concussion . . . it's equipment, it's training, it's prior injury history, its exposure, it's play type. There's so many things that...