An NFL source said late Saturday night that an MRI confirmed All-Pro halfback Adrian Peterson suffered a torn anterior cruciate ligament and medial collateral ligament when his left knee caved sideways on a direct hit from Redskins safety DeJon Gomes early in the third quarter.
Surgery to replace the ACL probably won't occur for at least a couple of weeks while Peterson regains his range of motion and the MCL heals. (Peterson's posterior cruciate ligament was not damaged, a source said. The lateral collateral ligament also is believed to be OK. The meniscus will be evaluated in the operating room and might need repair as well.)
An optimistic timetable would have Peterson returning to action no sooner than September. And recent research suggests even an athlete of Peterson's caliber may struggle to return to his previous performance level, especially one who relies so heavily on lower-body explosion.
The article doesn't paint a great picture about Peterson returning to the back we all know him to be, but time will tell. He will be a risk as we head into 2012 and those who were counting on keeping him will have to monitor his progress throughout the winter and summer months.