So, I last ran about 5 weeks ago. It was a nice 10 miler on a beach path about 15 min. from my house. Later that day, or the next, the inside of my left knee hurt. The same place that hurt after a Half Mary in Oct. I saw my P.T. (a friend) and he told me that I had a tear from a few years ago. I had forgotten. I have a GOOD FORGETTER. Well, I finally got in to see my Ortho dr, got the MRI, and was told that I would feel better if he fixed the tear. But, that is not what he's worried about. He told me that I have the beginning of an arthritic knee.