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mcirish.......I think you've done an excellent job psyching yourself up for this surgery. Please try to relax if you get to read this tonight. You may not sleep much tonight, but you'll be resting peacefully very soon. The neat thing about surgery is that, once you are up and on your way to the hospital, things just click along so fast. The next thing you know you're waking up in recovery!!! The waiting you've already been through is THE HARDEST part of the whole deal.
You will be so surprised at how stable your knee feels when you stand for the first time. It's amazing. Like you, I had a lot of instability in both my knees before surgery. In fact, with my first knee I had no idea what was going on. I would just be tricky-trotting along and .... boom....I'd fall flat on my face. I never knew when it was going to happen and there was never, ever any knee pain associated with it. Only my face hurt as it hit whatever I was walking on at the time! It took quite a while for me to realize I needed a new knee on the first one. And by that time ALL the cartilage was pretty much gone. With my second knee, I was a whole lot smarter. The minute I noticed that "giving way" feeling, I was at the surgeon's office and scheduling my TKR. It's been the best and I'm so glad it's done. You're going to feel that way too. Here's hoping that the PKR takes care of your arthritis for a long time!