Rams' running back Steven Jackson ran for three touchdowns against the Cowboys on Sunday but could miss the team's next game because of a thigh injury suffered in the fourth quarter. "We think it's just a bruise," Jackson said after the game. "We're going to get some more tests, an MRI in the morning, just to make sure. But it's just a little tight. I'm able to walk, and I'm able to bend it. So that's a good sign." He was walking with a visible limp after the game, and there was some concern that the injury could sideline Jackson for a week or two. Coach Jim Haslett said he had planned to take Jackson out of the game "on the next play" before the injury.