I had a fall today -tripped over a baby gate and fell directly on my knee cap of my right leg. I can walk with only a little pain and feel I am slightly weak in the right knee when full weight baring but if I bend it any more than about 30 degrees or if I twist it just slightly I get significant shooting pain through my knee. I had staged split stellar tendon transfer about 9 years and 10 years ago to correct patellar tracking/lateral valgus deformity problem and have very mild osteoarthritis changes in my knees. I am 44years old and active/muscular but a little overweight. I am concerned but not sure how worried should be about true joint injury vs bruising. I have taken naproxen and kept ice on knee intermittently since I fell but feels the same anytime I try to bend. Tried putting pillow under knee to elevate but uncomfortable because makes my knee bend. Any thoughts appreciated.