I might help (or not help) by sharing one or two things about my knee stiffness. I had very aggressive arthrofibrosis rather soon after my TKA. I didn't realize it at the time, but looking back, I knew something was wrong very early on. I had MUA at 10 weeks, and within a couple of weeks my ROM was going backward again. My surgeon ended up removing most of the scar tissue arthroscopically. In particular, there was a 1/4" in wide band that looked like a ligament tethering my quad to bone. No amount of PT will get rid of such thing. Even after that procedure, it was a month before I passed 90 degrees flexion (through very gentle efforts not involving a PT). Ever since I have had an effusion and a rather fibrotic knee, but it bends well and I can actually kneel on it. It does have laxity (meaning the knee is loose and the lower leg moves unacceptably side to side, but the metal components were well done and still very stable), for which I wear a brace. I don't have a perfect knee, I have an acceptable knee. No pain, and I can do what I want. I think studies are beginning to show that there is some fibrosis with all TKAs, and if I ever I have another knee surgery, I certainly would be strategizing how to avoid the perils of arthrofibrosis. Key is the kind of approach recommended on Bonesmart. I wish you luck on your endeavor. These are tough decisions.