I have one knee that Doc wants to replace.The other isn't far behind.I have had enough friends with repalced knees that didn't turn out good.Screw that.

Present Doc is giving me a lubricant type stuff, Euflexxa, 3 shots,1 week apart,every 6 months. Helped a bunch.So does riding one of those stationary bicycles 10 minutes a day, but it took 4 months to see any difference. Basically strengthening the muscles around the knee. I went thru the steroid injections for a few years.Gradually they got shorter and shorter in duration for help.

I have rods and screws in my back and replaced right shoulder. Neither is fully functional.

Try some CBD cream on it or some Sombra Cold Therapy Gel.Amazing stuff. The Sombra can be had on Amazon

Try everything possible before surgery or replacement.

If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles