I joined this site 6 months before my replacement and visited it almost daily and read hundreds of posts and many articles in the library. The one thing that stood out was that aggressive therapy slows down recovery, increases pain and decreases ROM. Many therapists, for some reason, are still using the old way to rehab a replacement. They treat it like a sports injury. The is not a sport injury. Far from it! We have had extreme damage done to our knees to get these replacements in there. Watch a total knee replacement on YouTube in real time. You will see why the knee should be treated very gently for months, and why it would take a year or more to become totally healed.
Even before my tkr, I never took therapy after my 10 previous knee surgeries and did great. So, I knew I wouldn't take PT after my replacement. I haven't taken any and am doing wonderfully! Much, much better than I was before the replacement! But, I didn't lay around and do nothing, I used my knee in taking care of myself, my house, my yard and 13 cats. Using your knee as it is intended to be used is all the therapy you need. If and when you do take therapy, don't let them ever hurt you. Don't let them touch your leg or knee at all. If you are in pain after taking PT, then your knee isn't ready for it and is telling you to back off of the exercises. All you need to do is gentle movements and walking. Walking is an excellent way to rehab knees without all the terrible pain of PT! Happy healing!