PITTSBURGH -- With the Pittsburgh Steelers fast running out of games and his left knee still not healed, star safety Troy Polamalu isn't certain if he will be back this season.

Polamalu is hopeful of playing again, but he said Tuesday there is no definitive date for his return.

Polamalu's latest injury, to his posterior cruciate ligament, was initially expected to be less severe than the medial cruciate ligament injury that kept him out of the Steelers' second through fifth ...

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