I've had both knees replaced and so I've been there and done that. For you however I would have the doc give you a knee evaluation (X-rays) and if the knees are not bone on bone, perhaps the doc can give you cortisone shots to buy you some time for awhile. That what I did until one knee got so bad it had to be replaced, and the other one was replaced three years later. I have had the operations done in January so I can recover during the winter months and then enjoy the spring and summer with my new knee. I realize that everyone is not the same and neither are their needs or conditions. Go from there, and good luck.