If possible, I would hold off on knee replacement until you can’t take the discomfort and pain. Go for cortisone shots as long as you can and do exercises to strengthen your upper quads. TKR is a very rough surgery. Although many people have success with it, I didn’t. The recouperation is long and difficult. My replaced knee still gives me trouble. I told this to the surgeon and his words to me were “Well, it will never be the knee that God gave you.” I am not doing my other knee. I will live with the bone on bone pain, keep exercising, use a knee brace, get a cortisone shot……..Anything but knee replacement surgery!!! Put it off until you can’t stand the discomfort any longer. Wishing you the very best with whatever decision you make.