Hey, I had ACL reconstruction back in 2003 and was really not much of a runner before my surgery. Since that time, I have completed 7 marathons and I have had no problems, check out www.michaelutt.com Before a long run I'll take a couple of Ibuprofens and it seems to do the trick, (one quack to another) no more complaints than anybody else I'm running with. If you are having pain problems you'll want to talk to your orthopaedic surgeon.