Since july 2011 i been having right knee issues. it first happened when i was dancing. .., all i did was a simply jump, like i was trying to Reach something on the ceiling... when i landed, i.felt a wierd feeling. But i kept dancing for the rest of the tonight, maybe 4 plus hours. Then i woke up the next day with a swollen knee. And ever since then, if i sprint, or run, that causes it to sometimes to go into inflammation. But yesterday i did a backflip.. around 3pm .. i didnt ice it.til 940pm an now its locked up?... an i cant extend it or bend it. Its stuck at a slightly bend angle.? What.do you think?