Just read in one of the post that you are an ortho. So glad to hear it - now I need some free medical advice. I posted this prob a long time ago and Lobo told me to see a specialist. Can't get into one here without first going thru your MD and the MD won't refer me. Here is the deal, I was obese 200+# for years. As long as I don't workout my knees are fine, two days of cardio and they are sore as hell - don't know how to describe it other than soreness. Lunges and squats make it unbearable. Running or two or three weeks of lunges and squats in the workout causes a searing burning pain when I try to sit down, kind of at the half way point of the sit if that makes any sense. My MD said it was just a little arthritis and to "take motrin, don't run, don't lunge, don't squat" That is not an acceptable solution for me. It is at a point where it is miserable but I can put up with it as long as long as the exercises aren't going to make it worse. If I need to see another MD I can - just invovles alot of driving (we live where there are far far more cows than people) and docs are scarce.