I caught a quick glimpse of the play on Sportscenter. It looked like his knee got pinned to the ground by a player falling on it. Could have been MUCH worse, and unless they come out with a suprise MRI result or something, I wouldn't worry too much about Ahman.
"Sometime during the Pats game last week, I decided that Tomlinson was the best overall running back of my lifetime. There's nothing he can't do: deadly receiver, tough inside runner, explosive to the outside, you name it." - ESPN's Bill Simmons