I'm currently using a walker, can't stand but for a minute, take Naproxen and tylenol athritis in order to get from bed to my chair, and to the loo. If I have to go out, I'm on hillbilly heroin (oxy). I'm 45. I have had neovisc injections about every 3 months in each knee for about 4 years. I stopped doing that 16 months ago because the cost was tremendous ($500/set). I've had one set of corisone shots but the ortho didn't recommend me continuing them because it destroys the soft tissue in the joint if you do it more than once a year. (And even then, for someone bone on bone ... why bother.)
I've been to see several ortho specialists. I've only found one that will do my knees. However, he won't do anything until I am at or under 250 pds. His approach is that he will try to do a half knee replacement, if he can.
All the other doctors have said no because of age and weight. When I query the ones that said no because of weight, they say they still wouldn't operate because of my age. They say it would be a dis-service. They cannot understand why a doctor WOULD operate.
As you probably already know, there are risks involved with the surgery. It's not a 100% effective. I forget the actual percentages .. but something like 80% of the first knee surgeries are ok. They currently anticpate that a replaced knee joint will last approx. 10 years or so. A second knee operation goes down to a success rate of like 50% ok. There is more liklihood of issues with ligaments and other soft tissue that are required to support the joint. Or, you have the "joy" of a fused knee.
So, even taking that all into account, I still desperately want a knee operation and am doing what I can to loose the weight. It just takes so darn long if you want to do it healthy and you can't move! I'm seriously looking at WLS to help me get the weight down quicker.
I hope you find your doctor. Check out sports doctors. He's the guy that will do my knees. The regular guys wouldn't.