In my humble opinion (I am not a doctor), you need to give yourself more TIME.
How often do you go to PT? I think you have been pushing yourself way too hard, which increases swelling, which reduces ROM.
A MUA this early is too aggressive, which just increases swelling, which just reduces ROM. Give it more time...............
I have been through a lot of surgeries in my lifetime - my RTKR was one of the worst. A surgery that involves breaking bone is usually much more traumatic vs. a soft-tissue surgery. A surgery as traumatic as this one, will take a year plus to recover.
Skip PT for a week. What have you got to lose? You can always do (some) exercises at home, but I would advise just taking it easy. Your body has been: sawed, hammered, glued, maybe stitched, etc, etc. Your body considers this as trauma and it needs time to recover. Our bodies are not like flashlights: when the battery dies, just slide out the dead one and then put in a new one. Our bodies are not like that. You can't just take out one knee and slip in a new one, wake up and expect to go running around like nothing happened. You need to give your body time to heal.
Any PT that makes you scream to measure your ROM is way too aggressive. Forget ROM. Unless there is a big, major health problem going on, ROM is just a measurement for the PTs' personal job evaluation (usually). Just forget ROM - take time to heal. You can work on ROM later.
Everyone heals differently. Stop comparing yourself to everyone else.
It just takes time...............
Wishing you the best,