Quarterback Brett Favre recently opened up about some memory lapses, which be a sign of chronic traumatic encephalopathy. Find out more about this disease and some of the professional athletes who have suffered from it.
The NFL Players Association initially refused to pay Mackey a disability income due to there not being a proven link between brain injury and playing football. The league and the NFL Players Association have responded with the "88 plan" – named after Mackey's number.
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