(St. Louis, MO)  --  The Rams will be without wide receiver Keenan Burton for the rest of the season.  Burton injured his right knee during Sunday's loss to the Saints and expected to undergo surgery.  Burton is the third Rams wide out to suffer a season-ending injury this year, joining Laurent Robinson and Brooks Foster.  The 1-and-8 Rams will host Kurt Warner and the NFC West-leading Arizona Cardinals this Sunday.