Stated I must really work the knee through pain- if not I will lose the knee,
also she say if it don't straighten soon it will never do. Signed me off stating cannot help me no more
Surgeon not sure why knee will not bend just states it stiffness and my lose the knee. so now worse state than I started
Both your surgeon and your PT therapist have told you something that isn't correct.
It makes me angry when I hear how they frighten you with dire predictions.
You are in no danger of losing your knee.
It's probably their insistence on you pushing through the pain that has prevented your knee from increasing ROM, both bending and straightening.
Myth busting: no pain, no gain
All that tough treatment has kept your knee swollen and upset. It needs time and gentle treatment, so it can calm down and its swelling will decrease.
It's only 4 months since your surgery and complete recovery takes a full year. You still have plenty of time.
There's no need to rush to get ROM (Range of Motion) because it can continue to improve for a year, or even much longer, after a knee replacement. There isn't any deadline you have to meet:
Myth busting: the "window of opportunity" in TKR
It's not exercising that gets you your ROM - it's time. Time to recover, time for swelling and pain to settle, and time to heal. Your ROM is there right from the start, and it will gradually increase as your knee heals.