EDEN PRAIRIE, Minn. -- Receiver Greg Childs just couldn't make it all the way back in time to start the regular season for the Minnesota Vikings. Childs, who suffered tears to the patellar tendon in both of his knees in training camp last year, was placed on the regular-season physically unable to perform list by Minnesota on Tuesday, meaning he will miss at least the first six games of the season. The move gets the Vikings to the 75-man roster limit before Tuesday's 3 p.m. Central time deadline. Childs has been working to recover from the devastating injury. He hasn't returned to practice, but he has been working out with the teams athletic trainers and strength staff on the side fields at practice. Childs is running and ran the hills at the team's facility at Winter Park last week during the team's practice. Childs said he has been running since February and he said during the team's offseason program that he had caught passes, done cutting and running routes at less than full speed and jumped on his two surgically-repaired knees. Childs, who had torn the patellar tendon in his right knee during his junior season at Arkansas, never doubted he would return from the potentially career-ending injury. "I'm doing all the things I was doing before," Childs said in May. "I'm pretty much able to do all my drills, all the wide receiver drills as of right now." Childs said he's returning quicker this time around with the two tears than he did from one and credited the team's medical staff with the surgery to strengthen his knees. "Basically, I just have to keep getting my quad strong," Childs said in May. "And also when (Dr. Joel Boyd) went in, he did a great job. He went in and repaired both my knees for me. So basically he did something a little different than I had done the first time, which basically tightens it up and strengthens my knee. So I'm not really worried about it." Childs was drafted in the fourth round of the 2012 draft and has yet to appear in a game for the Vikings.
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