I'm sorry, apparently I'm not enuff of a kneegeek to be able to reply to messages. Can u recall what studies I posted? I've posted a few things on here, mostly in response to people freaking out about arthritis and running.
FYI I do run, definitely (although this week i did something weird to my FOOT! arrgh). I don't run long distances though. My knees are fine with 15-20 miles per week so far. I try as much as possible to run on grass or dirt, although most of my running is on roads. I *never* run on concrete. I do a lot of core work, and a lot of stuff like pushups and crunches, and I'm starting to do pullups but I can only really manage one pullup and one chinup so far. I think the upper body stuff helps me a lot to run lighter on my feet. Since hurting my foot I've been pool running and I think I'll incorporate it into my running schedule, it is a really good workout (boring, and hard, but i think it helps a lot with strength). I've had about 7 prolotherapy sessions and 4 PRP. Last one was in March 2010. My knees feel pretty good. Of course I'm probably still athritic, but I seem to be somewhat asymptomatic. You should check out some runner boards, there are a few of us around....
Hope this helps.