I have been experiencing some knee pains recently and I can't figure out what has happened or how to fix it. I haven't fallen oddly but one day I just stood up from being on the ground and a jolt of pain shot through my right knee. Now my knee hurts when I bend it past a ninety degree angle. I don't believe that it is my actual knee that is damaged but a ligament or muscle right above the kneecap itself. The pain is on the upper left corner of my knee...I don't see a fitness trainer until next monday, (week of break from tennis) so if anyone has some advice on what to do it would be greatly appreciated.