Rams backup defensive end Sean Moran will miss four to six weeks after suffering a cartilage tear in his knee. Moran will undergoe arthroscopic surgery to repair the damage. Moran has been playing with the first-team defensive line while starter Grant Wistrom recovers from offseason surgery. Moran was slated to be the team’s top reserve at defensive end. Gaylon Hyder or Lionel Barnes will start in Moran’s place against Tennessee Monday.