Steelers safety Troy Polamalu left Sunday night's 13-9 win over Kansas City after his head banged into the knee of offensive tackle Steve Maneri. Maneri lined up in the backfield as an eligible receiver and hauled in a short pass from Tyler Palko. Polamalu came up to make the tackle and dove at Maneri's legs, his head banging into the big offensive tackle's knee. Polamalu, who had been dealing with some sore ribs, looked a bit wobbly as he got up. He was helped to the sideline by trainers and did not return on Pittsburgh's next defensive series.