Originally written on Football Nation  |  Last updated 2/14/13

SAN FRANCISCO - NOVEMBER 12: Devin Hester #23 of the Chicago Bears in action against the San Francisco 49ers at Candlestick Park on November 12, 2009 in San Francisco, California. The 49ers won 10-6. (Photo by Jed Jacobsohn/Getty Images)
A few years ago, Devin Hester and Johnny Knox weren't only one of the most dynamic wide receiving cores in the league, but two of the better return men in the league also. Unfortunately, Knox suffered an apparent career-ending injury, as he is walking away from the game. Knox endured the injury when he was hit by Anthony Hargrove in 2011, which caused a serious Spinal Cord issue. Knox hasn't been the same sense, was cut by Chicago, and has decided his time was up in an NFL uniform. After he received the hit, he went under the knife and will never be the same as he once was. Back problems can be serious, and running and taking a hit is obviously brutal with such problems. When Knox was released by Chicago, you could probably assume he wasn't going to play in the NFL anymore. He might play in a lesser league, but he wouldn't be able to handle it anymore. He missed so much time because of his back injury, and that isn't something you just get over in a year. For the years he played inj...
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