Cortisone or nerve block injections might help.
glucosomaine is helpfull for pain relief, tablets and gel, (gel for within a couple of days relief) and tabs for long term, you have to take the tabs for at least three mths for them to start working though....it's suppose to replace the gunkey stuff behind the knee cap, i use it all the time (gel) for my discs in my back....hope this helps...