I am in a similar situation in that I have had both knees scoped for meniscus damage and now have constant discomfort in both. I will be going to the doctor in two weeks and am going, in part, to ask for a referral to an orthopedic specialist.
Not to disagree with 'Turtle Jack', but there are some alternative treatments that claim to offer help. I am not recommending these folks but I am going to try to hang onto my own knees as long as I can. Once you have parts replaced there is no going back, and if knee replacements are like hip replacements, they may have to be re-done in about 15 years.
Remember, I know only what the websites claim, and nothing more.
Since your doctor didn't mention anything like this to you alternative treatments may not be an option.......or the doctor may not be be aware of other treatments.
For anything short of replacement I will be looking for a doctor that works on the knees of the local football team, but I don't know who I will turn to if I need total knee replacements.
Good luck and don't hesitate to ask over in the 50+ forum, since we are all wearing out over there.