At 63, I've had plenty of knee problems and my right knee is far from perfect. (meniscus tear among other things was diagnosed by my orthopedist. I would suggest going to an orthopedist (preferably an osteopath rather than a surgeon) and checking for actual damage, then having him/her refer you to a physical therapist with sports medicine experience. Assuming nothing seriously damaged requiring surgery, a good physical therapist will prescribe exercises to strengthen and stabilize the joint that can vastly improve knee function and reduce pain. If you belong to Kaiser, they even have "knee classes" that concentrate on knee rehabilitation.