If you can manage transportation and have insurance for possibly having to go out of your coverage area (I had to switch insurance policies), I suggest
1) Hospital For Special Surgery in NYC. They are #1 worldwide in Orthopedics. A downside is that HSS does not accept Medicare.
2). The Mayo Clinic in Rochester, Mn., #2 Worldwide in Orthopedics. Mayo accepts Medicare.
I had a second opinion for a condition that sounds a lot like yours. Arthrofibrosis, excessive scarring. HSS recommended that I have the replaced knee replaced with a “Rotating Hinge” knee. With this complex surgery, they remove the knee tendons, as they are a place that excessive scarring often develops with can cause pain and severely limit your range of motion. The hinge then takes the place of your tendons. If Mayo concurs with HSS, I expect to have the surgery in mid 2025. I hope this helps. Best of luck. ☮️