The Pittsburgh Steelers have several defensive heroes, but Troy Polamalu might be the most famous of them all. Unfortunately with his history of concussions, the injury he suffered early in the first quarter of tonight's game against the Kansas City Chiefs has to be taken very seriously. In trying to tackle Steve Maneri, Polamalu had another possible concussion -- or at least got shaken up -- and will have to be checked out on the sidelines. Here's the video below:
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