David, like everyone else is saying, the people I know who have had their knees replaced wonder why they waited so long. I'm sure it's scary and the rehab will not be fun, but it won't last forever and then you'll be better than new! You have to keep focusing on that part and before you know it it will be all over. I know, easy for me to say).

Here's a link to some info on the first real bionic man. Yes, the series was based on a real guy. Quite interesting reading and I thought it might cheer you up a bit.