i'm in the same boat you are, i was told my knee cap was out of place, shifted to the side about a quarter inch, and there is nothing that can really be done to fix it. There is surgery, but according to the doctor, it is only a temporary pain relief. He basically said that i have to live with it, and i'm only 20. I started riding a bike this summer and it helped a little to strengthen everything, but i still get sharp intense pains when i bowl more than two or three games. it really sucks...