My .02 .......had my right knee done three years ago this coming Feb. I was 55, really bad knee from an early accident, two bad surgeries, one with a superbug infection, almost killed me...
That being said, I am so glad I had it done.....found the best Doc, did exactly what he said, worked my legs out hard at the gym for two months before surgery, two days in the hospital, within two weeks I was walking(slowly) without a cane or a limp. It did take a full year for it to be really healed, flexible and such but now I can squat down and up, no pain. Riding my bikes was very painful with my leg bent, caused me to sell a couple of them, now, no sweat. My butt hurts long before my knee. If you do it, do it right, and hopefully only once.......good luck....