Vikings running back Adrian Peterson hopes to be on the field for Week 1 of the 2012 season. Peterson will have left knee surgery following a pair of torn ligaments suffered in Minnesota's Week 16 win over Washington. "We expect most people to recover from this injury in eight to nine months and instead of comparing Adrian to any other player at any level that's had an anterior cruciate ligament, and they happen every day, I would really like Adrian to stand on his own merit because Adrian, I feel, is very unique," Vikings head trainer Eric Sugarman said Monday. "Adrian has a great work ethic. Adrian has the DNA to heal quickly, which he has shown in the past. He certainly will have the desire and the mental toughness to be able to get through the rehab process, which will take months and months, as you know. So, I think if anyone can get better quickly and safely in that time period, it would be Adrian Peterson."