the Dr. said patients are at 100 ROM by now, you're behind.
These doctors and PTs who set timetables for their patients make me want to scream! There's no way the ROM at 3 weeks should be taken as an ultimate, much less threatening with an MUA because of it! You are perfectly correct when you say the swelling is blocking your ROM and there is NO way you can get more until the swelling goes down.
And I echo the advice and comments from others about the MUA.
Read this post and see that you DO have control over this.
So I'd like to ask you some questions if you don't mind, and it would be very helpful if you would answer each one individually - numbered as I have done - in as much detail as you can then I'll come back as see where you are ....
1. what are your pain levels right now?
(remember the 1-10 scale: 1 = no pain and 10 = the worst you can imagine)
2. what pain medications have you been prescribed, how much are you taking (in mg please) and how often?
3. how swollen is your leg compared to these?
4. what is your ROM - that's flexion (bend) and extension (straightness)
5. are you icing your knee at all? If so, how often and for how long?
6. are you elevating your leg. If so how often and for how long?
7. what is your activity level? What do you do in the way of housework, cooking, cleaning, shopping, etc., and
8. what kind of PT exercises and exercises at home are you doing? How much and how often?
This is the most crucial question so please help me by using the format I have left as an example
(which means please make a list and not an essay!)
Exercises done at home and how many sessions you do each day
enter exercise by name then number of repetitions of each
etc., etc.
At PT (how many times a week)
enter exercise by name then number of repetitions of each
etc., etc.