Numbzee.....please don't allow the therapist to do things that cause you pain. Despite what these folks think, it is counterproductive to a good recovery from joint replacement surgery to push your knee like that. You should do movements that take you to the point of mild discomfort and then stop. You have the right to tell the therapist this is how you want to proceed.
You are more likely to get scar tissue with a knee that is inflamed, swollen and angry because of pushing too hard than you are from taking a more gentle approach. Actually, development of scar tissue that impedes your range of motion is not that common. Most people have the ROM but it does not show up for a while because of swelling in the knee. Even if you cannot see the swelling, it can be there....within the very compact knee compartment....and just a little can hinder that ROM.
There is no window of opportunity here either....something you might hear from a therapist or even a surgeon. We have members who gain ROM for a year or more very frequently. In fact, that's more the norm than anything else!
Was this the same therapist who was so good and gentle just last Thursday? If so, what happened?????
Don't be discouraged by the difference in ROM numbers from a CPM and a physical measurement. They are never the same and the machine settings will always be greater than what your actual ROM will measure. Don't know why that is, but it just is.