I had arthroscopic surgery 8 weeks ago for a medial meniscus tear. The OS removed small piece and said everything else looked great - no arthritis, no further damage. He said to wait 2 weeks before starting any kind of weight resistance or impact-type of rehab. but after that, I could use my own comfort level to judge my progression through rehab., and he didn't discourage me from running. I started my rehab. very carefully with the elliptical - beginning with low resistance and increasing when I felt I could. I then started a slow walk/run routine and, although I felt some weakness and had some minor swelling afterward, I didn't feel like I was overdoing it. Last week, I completed the Disney HM; however, I didn't run for the entire 13 miles. I started with a run/walk and then walked the last 5 miles. My knee was in terrible pain at the end. Now, a week later, that "terrible pain" is gone, but I have definite weakness and, with certain movements (side to side), there's a sharp twinge of pain at the exact site of my original injury. What do you think? Could I have retorn my meniscus? What else could be causing this pain? Can you tear the meniscus in the same spot - even though it's been removed from that spot? Could I have done other damage?