Jon Kitna admitted after Sunday's game that he sprained his knee in the loss and that it "feels pretty bad right now."Coach Rod Marinelli wouldn't speculate on how much time he might miss, but Kitna has the upcoming bye week to recuperate. Still, he is in danger of being benched for Drew Stanton. Marinelli likely won't make a quarterback change official until the winless Lions resume practice leading up to Week 5. Calvin Johnson and Roy Williams owners should be concerned. Sep. 22 - 12:08 am et