Hi,
I have a little problem that I hope I don't have to seek medical attention for nor de-rail my spring marathon plans.

Since the beginning of January I have felt a warm feeling behind both kneecaps. I started taking Glucosamine and Chondroitin Sulfate (naturally sourced) and noticed a difference within three weeks. Last week the feeling came back almost to the point where it was a burning sensation. I have no pain, but don't want to do anything that might invite pain. I also need to mention that I think the problem may have been caused by an old pair of running shoes that I have had a lengthy relationship with.

I work on my feet all day and have started a marathon training program. The 'warm feeling' comes and goes and only seems to be aggravated by running on hard surfaces. As running can be nasty to the joints I have wisely deceided that my long runs will be done indoors on an elliptical trainer.
Does anybody have any idea what my problem might be? (besides old shoes I shouldn't be wearing anymore?)

Thanks,
Joyce