@amytro I never ran into that, but my orthopedic surgeon advocates "gentle PT", meaning it should not be extremely painful. I had a different ortho for my first TKR and a different physical therapist. She would have me lie down on my back and forcefully bend my knee until I literally screamed in agony. None of that with my second knee, thankfully.
With the first, I did have pain after PT, with my second I did not.