1999: Industrial accident that involved myself, a laborer, and the 20" steel beam we were carrying, when the laborer dropped his end, resulting in the "destruction" of my left knee. I was told that, anything that can be torn/broken, or otherwise hurt, was. The pain was incredible. Destroyed was the doctor's word, not mine, and it was. 4 failed surgeries later they gave me a total knee replacement.
That was 21 years ago, and while I obviously retired from welding, I still work. Now, the other "good" knee is done, kaput, shot. It carried me for so long now it's time for surgery: I undergo total knee replacement on that knee in just under 6 weeks. I dread the recovery like you wouldn't believe, but the terrible everyday pain, plus not knowing if it's going to just give out on you, make the decision much easier.