I tried treating my knee for arthritis and other fun stuff. None of it worked. I finally talked to my chiropractor about it and he told me my IT bands were tight. They were pulling the patella out of alignment. So, he has me stretching.

A friend of mine is a massage therapist. She checked out my legs as well and noticed the same thing my chiro did. She also has me doing stuff. It's working. So, it may not be joint-related, but muscled-related.

Also, check that your seat is the right height. (You can have knee pain if it's too low.)