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How long will Adrian Peterson be out?

"Congratulations to all who took home the championship trophy in Week 16 and, frankly, to all who gutted out the season, regardless of how you ended up placing in your league(s). We appreciate those who play hard right up until the bitter end. Speaking of which, a number of fantasy leagues take their championship matches right through the bitter end, otherwise known as Week 17, seeking a challenge by playing in a week where teams may alter their rosters either because they have nothing to lose or everything to gain by fielding backups. If you're playing for glory this Sunday, then the injury news is of import, but be forewarned: The picture of who sits and who starts may be even cloudier with the playoffs looming next month.

One player we already know will not be present on Sunday has been a staple in virtually every fantasy football league for several years running. Unfortunately, the most dramatic -- and devastating -- injury of Week 16 was the one suffered by Minnesota Vikings running back Adrian Peterson, who took a blow to his left knee that left him visibly in pain and on the ground. The video, difficult as it was to watch, showed Peterson's knee moving into an awkward combination of valgus (bowing inward) and rotation, finally coming to rest at an odd angle underneath the weight of his body. Even in the absence of any specific knowledge of anatomy, the visceral reaction viewers collectively experienced while watching a knee bend in ways that it shouldn't told us something had gone terribly wrong. Peterson officially has a torn anterior cruciate ligament (ACL) and a torn medial collateral ligament (MCL) along with some damage to both the medial and lateral meniscus. He is expected to undergo reconstructive surgery in the next week to 10 days. The true extent of the damage within the joint may not be fully appreciated until that surgery takes place. For now, the Vikings remain hopeful that Peterson will be ready to contribute early next season, but understandably the timeline must remain fluid to allow for the many unpredictable variables that accompany this type of injury and subsequent rehabilitation.

Working in Peterson's favor are his youth (he is 26 years old with only five NFL seasons under his belt), his physical fitness and his work ethic. He has also shown resilience in responding to past injuries that were expected to either keep him down longer or potentially hint at future problems. While a junior in college at Oklahoma, Peterson broke his clavicle, which forced him to miss the last seven weeks of the season. He entered the NFL the following year with some concern about whether the collarbone would be a problem. It was not. In Peterson's first NFL season (2007), he did suffer a less common knee ligament sprain, a lateral collateral ligament (LCL) injury (incidentally, which was to his right knee). Not only was Peterson back on the field within three weeks, the knee healed well and did not prove to be a liability going forward. In fact, since that time, Peterson had missed only one game until suffering a left high ankle sprain just five weeks ago. Peterson returned in Week 15 after missing three games, but just one short week later, his world turned upside down with this latest injury."


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