Every NFL star got to where they are by working hard and by having the talent to get them there. Some had in in their blood, Peyton Manning is proof of that. Some had to outwork their peers, James Harrison is proof of that. Some landed in the right place at the right time, Tom Brady is proof of that.
But how do you go from being one of the most feared, most respected players in the game to someone barely hanging on in the NFL. Why did it work for Matt Ryan but not Matt Leinart? Why is Terrell Owens hopping from team to team and Albert Haynesworth can't be a starter?
Sure athletes screw up their careers all the time due to injury but that is part of the game. Here are the way that the top 50 players in the NFL could see their careers go off the tracks.