I have this also, I shattered my patella 6/08 and have been in therapy three times a week since. I am six weeks post op of my second surgery to remove the hardware. The lump developed on the lateral side of the quad about two months before the second surgery. It feels a little funky but doesnt really hurt. Asked my os about it and he said it could be scar tissue....doesn't sound right to me. Pt doesnt know what it is either. I dont think it could be a ruptured tendon or even a torn tendon because there would be serious pain with that.... did you do anything to your knee, does it hurt? Please post if you find out more about your problem.