Adrian Peterson's knee surgery is 'successful'

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EDEN PRAIRIE, Minn. (AP) -- Minnesota Vikings running back Adrian Peterson has had surgery to repair torn ligaments in his left knee.

Coach Leslie Frazier said the team was informed that Friday's operation by Dr. James Andrews was "successful" and that Peterson was "resting comfortably." In a statement distributed by the team, Frazier wished Peterson a "speedy recovery."

Peterson tore the anterior cruciate and medial collateral ligaments in the knee during last Sunday's game at Washington. He finished his fifth year in the NFL with 970 yards and 12 touchdowns rushing.

The Vikings have said they expect him to be ready in time for the start of the 2012 season.