What do you do at PT? Have you been going to PT since your surgery?
It might be worth getting a second opinion about your knee, someone in a different practice, that has no association with your surgeon, to get an unbiased opinion.
Sometimes it just really takes a long time for some of us to heal. I had a very tough first year, but I did continue to improve. My partial is still not great, but it’s better than it was at 11 months post op. In my second year my ROM continued to improve as I continued to heal and my whole leg relaxed more.
I‘ve had 2 second opinions, one at 15 months and one at 2 years post op, and neither doctor looked past my “good” X-ray, to find a reason for my poor outcome. But, as I said, I’m better then I was, so I’m living with it, because, as you mentioned earlier, more surgery makes me feel sick.