@heyjoe415 : Yes. I agree. How the knee works trumps all. I noticed you said “knees”. 2 of them? Really? I did one after limiting pain (torn meniscus, bone spurs, etc.) hobbled me and after repair surgery did not help even with extended PT, cortisone, hyaluronic injections, I bit the bullet. Without doing enough research (robot-assisted, conformis knee, etc.) - time pressure, trust in Ortho, babe-in-woods - I got your basic knee replacement surgery.
… . Same hypothetical situation today: first, PRP. Then stem cell. Then custom surgery for TKR. Anyway, I ended up with a superior outcome, but average recovery and quite a lot of pain, due to nomo opioids after about day 8 (I was going nuts being stuck at home, and wanted to go out and drive somewhere / anywhere to take mind of things). My admiration for having both knees replaced, and both of them working well. It does help if one is in good shape before the surgery, which I also was, very much, so. Still, I do miss the easy dropping to my knees to look for something under a couch, or having to dust a low bookshelf. Not a good feeling, even with only one fake knee. But - I dust less often now.