Adrian Peterson prepares to return to Washington 9 months after knee injury Filed under: frazier rehab center Peterson's optimism was met with a skeptical eye, but the determined runner threw himself into a rehab program that allowed him to return for the 2012 opener. Glimpses of the old Peterson have steadily started to reappear over the last few weeks … Read more on Washington Post   Get the 1500 ESPN SportsWire delivered to your inbox daily, and keep up with … Filed under: frazier rehab center Read more... ...