On the same day quarterback Ben Roethlisberger returned to the field after missing four games, the Steelers lost their most dynamic playmaker, running back Le'Veon Bell, midway through the second quarter after his right knee was twisted badly while getting tackled near the Steelers sidelines.

According to CBS Sports sideline reporter Evan Washburn, Bell couldn't put weight on his leg as he stood on the sidelines being evaluated, and took a cart to the locker room.

The Steelers announced that Bell was being evaluated outside the stadium and won't return to the game. After the game, CBS Sports NFL Insider Jason La Canfora tweeted this:

Bell, who missed the first two games of the season while serving a suspension, injured his knee against the Bengals during Week 17 of the 2014 season, causing him to miss the Steelers' playoff game against the Ravens.

You can follow all the action in the Bengals-Steelers game with CBSSports.com's GameTracker.

Le'Veon Bell was injured midway through the 2nd quarter. (CBS)
Le'Veon Bell was injured midway through the 2nd quarter. (CBS)