David, in this retirement area where I live knee and hip replacements and heart stints are common. In recent years the advancement in both the replacement hardware and operating techniques have advanced incredibly. You may be walking in the hospital the same day as the surgery and back to near normal in weeks. A friend had it done recently and was beaming with joy at his new found freedom, no more cane, crutches or limp. If you are hesitant, don't do it now. Your knee will tell you when it should be done. Good luck.
"Folks is funny critters."
Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire