Interesting, does your patella tendon get hot/inflammed(sp)?
I had surgery on mine from soccer. I can possibly help you with any excercises/strengthening stuff.
http://www.sportsinjurybulletin.com/...ar-tendon.html
Edit: Check this out also dude.
http://www.medicinenet.com/patellofe...me/article.htm
Your probably having problems becasue your muscle is cause a strain on that tendon cause the muscle isnt strong enough. Happened to me, over time caused my patella tendon to partially tear.