Well, my wife and I traveled over the holidays, so i was out of commission for about 2.5 weeks. Finally, when I got back, I had a day off and decided to do a half-marathon. I was running 17 miles or so prior to the 2 weeks off. Stretched and everything, and around mile 10 I started feeling a slight pain above my left knee. Slowed and began to walk home, pain got worse. Relaxed for a day, went cycling for 30 miles and was pretty fine. then went jogging the next day for 5 miles and the pain began gradual and began to really hurt. when not exercising, I feel fine. As far as diagnosis, I went to a gathering of residents and two attending doctors. Both of the attendings said that it was more than likely a stress fracture if it does't hurt all of the time (muscle pull). My wife, a resident, is doubtful of the diagnosis, but I want to play it safe. I have an appointment with my primary care physician this week, so we will see.