Steelers' Polamalu hurts knee vs. Bengals
Pittsburgh Steelers safety Troy Polamalu has gone to the locker room with a left knee injury following Cincinnati's opening drive. The team said his return to the game was doubtful.
It was not immediately certain when Polamalu was injured. He was on the field throughout the Bengals' first possession, which ended with Shayne Graham's missed 51-yard field goal attempt.