Redskins backup running back Ladell Betts has been diagnosed with two torn ligaments in the knee he injured Sunday and will miss the rest of the season, a team source told ESPN NFL Insider Adam Schefter.
An MRI exam revealed Betts tore the anterior cruciate ligament and medial cruciate ligament of his left knee when he was injured midway through the first quarter of Washington's 7-6 loss to the host Cowboys, the source said.
The MCL injury was orginally reported to be a tear of the posterior cruciate ligament.
The Redskins had already lost Clinton Portis for the Dallas game and next week against the Philadelphia Eagles with concussion-related symptoms.
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Redskins right guard Chad Rinehart, who broke his right leg early in the third quarter, was having surgery Monday morning and will be out for the year.
"It's just one of those things where someone else gets an opportunity," linebacker London Fletcher said. "They aren't going to cancel the game in Philadelphia because the Redskins aren't healthy."
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