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Unhappy Triad

Running back Adrian Peterson #28 of the Minnesota Vikings is helped off the field after being injured in the third quarter against the Washington Redskins at FedEx Field on December 24, 2011 in Landover, Maryland. (Photo by Patrick Smith/Getty Images)

Injury Breakdown: Adrian Peterson And The Unhappy Triad

Adrian Peterson, 26-year-old Minnesota Vikings’ running back, went down last Saturday with what is sometimes called an “Unhappy Triad”. The “unhappy” part is obvious. The “triad” is, because the injury represents a triple threat.

12/29/2011