I think you'd be wasting your time trying to discuss it with the PT. Just tell him/her at your first appointment that you will be co-operative, but you will not allow any exercises that take you beyond discomfort into pain, that you do not want the PT to push or pull on your knee, and that you will not exercise to what you consider to be excess. If the PT can't follow your wishes, there's no need to argue. Just leave. You can do exercises at home, or look for another clinic, where they will respect your wishes. Your knee can recover, even if you do no formal PT. Your normal activities of daily living will be enough exercise for it. It's your knee and you have the absolute right to say what you will allow to happen to it. You don't have to please your PT. She/he has to please you. Saying no to therapy - am I allowed to?