Sorry to hear that man, I have Patellar Tracking Syndrome, or one of the varied names it's called and it *****. I had a Lateral Release done to fix the off-line knee cap
, and it failed as well. All of my cartilege was gone, and my pain is just as bad, although different.
My other option was literally sawing through the bone and resetting it, but like you wish you hadn't done it, that's what I'm afraid of. What if it fails and is even worse?