Dr. James Andrews, the world?s foremost authority on sports injuries, said today in a statement provided to the Vikings that RB Adrian Peterson?s right knee injury should be evaluated on a ?week-to-week basis.? Andrews? evaluation jibes with the Vikings? original position that Peterson will recover in time to play again this season. The full text of the statement, which is addressed to the Vikings: ?I have reviewed Adrian?s MRI and agree with your assessment and diagnosis. I agree that you are taking the correct approach. He has an isolated injury to his lateral collateral ligament. He should be re-evaluated on a week-to-week basis and be allowed to progress as his symptoms allow.?