Minnesota Vikings running back Adrian Peterson (28) is helped off the field after an injury during the second half against Washington Redskins in Landover, Md., Saturday, Dec. 24, 2011. (AP Photo/Evan Vucci)
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Minnesota Vikings running back Adrian Peterson (28) is helped off the field after an injury during the second half against Washington Redskins in Landover, Md., Saturday, Dec. 24, 2011. (AP Photo/Evan Vucci)
