The Titans have lost starting linebackers Keith Bulluck and David Thornton for the remainder of the season. Bulluck tore his left anterior cruciate ligament on Sunday and Thornton will have season-ending shoulder surgery later this week. "David was playing very well this year when he was able to play and Keith, Keith is kind of the cornerstone of our defense, and he has been for so many years. I don't need to speak about the consecutive starts and production. He's gone from AFC defensive player of the week to gone for the remainder of the season," Tennessee coach Jeff Fisher said.