Hi,...So from there went to Kempo, and it wasn't too bad on the knees, tho I still wore heavy braces. then a funny thing happened. As I started doing these things called forms--which I hated, btw, cos they seemed to have nothing to do with fighting--my knees started to get stronger (actually, the muscle around the knees).
Good point... some people have knee problems because the muscles that support the knee, particularly the quadriceps, are weak. Stengthening them will help alleviate certain knee problems, and requires no medical intervention.
I'm not familiar with Kempo forms, but the low stances in certain styles of all of the Karate-based arts are very good for strengthening the legs.