The Cardinals may be without rookie running back Ryan Williams for the entire 2011 season. He was carted off the field with a right knee injury early in the third quarter during a preseason loss to the Packers Friday night. Cardinals coach Ken Whisenhunt said the team was "pretty certain" Williams ruptured his patella tendon. "If it is what we suspect, then, yes, it's a season-ender," Whisenhunt said.