It really amazes me how some are so paranoid about their ROM. I have been thru this ordeal way too many times. Your ROM will come back just by doing everyday normal activities. If you want to allow therapists to cause you lots of pain with increased swelling just so they can say you improved by a few degrees it's your knee go for it. If you hate pain, (I know I do), do not worry about it, ROM will come back it just takes time could be months, could be longer and for those that think the harder I try the faster I will heal. Good luck with that line of thinking.
Bottom Line no one heals the same we are all different. Just because a Dr., a nurse, or a therapist claims that at a certain period after surgery you should be at a certain degree, sorry to inform you that is false. If the therapist you currently have is causing you too much pain get a different one. He/she is not paying you, you are paying them. Not trying to upset anyone but really, as much info and suggestions on how to proceed after surgery are on this site and then the advice is not followed, go figure on your progress.