You're correct ouch. I misread your original post and for that I apologize. I still wouldn't give up on PT, or better, find a trainer with a degree in kinesiology at a good gym. Preferably, do both. Please don't give up.

And for all of you who have had bad outcomes from TKR due to a bad surgeon, or a surgeon's mistake, or other considerations mostly out of your control, I am truly sorry.

For those considering a TKR, research and find a good surgeon who commits to follow-up visits. If you need to lose weight, hold off on the surgery until your weight is down to what your surgeon recommends. (I was about 20 lbs overweight at 5'11" when I had the TKRs and I managed fine. Now I am at normal weight, largely because the TKRs allowed me to get back to the gym. When I suggest losing weight, be reasonable with yourself.) If you smoke - quit (I did, a side benefit). And finally and most important, get your leg muscles in shape pre-surgery and do all of the post-op rehab.

Sorry again ouch. I wish you the best. Just please don't give up.