My knee doctor, who did a successful surgical "clean up" of my knee about then years ago, told me I presently have nothing wrong with my knee that would require surgery.
He told me I needed to work on my body mechanics and he sent me to a highly credentialed physical therapist.
It turns out my real problem, which causes real pain in my knee, has everything to do with my ankle, hip and back, and nothing to do with my knee.
When I do the things my physical therapist has taught me to do, the pain goes away.
When the pain comes back, I realize I have fallen back on old habits, on the old ways of organizing an using my body, and it reminds me to do what I have to do.
The techniques that work for me probably won't work for someone else, and so I won't even try to describe them.
However, I would suggest asking one's knee doctor for a referal to a physical therapist, and especially a physical therapist who specializes in sports medicine and/or who has additional training in the Feldenkrais method.