I'm sorry, I just saw your exercise question. I learned a lot when I lost the gains of my MUA and needed further intervention. Perhaps that would've happened anyhow. But what a miserable chapter and not one I would wish on anyone. If I had to do it over again, I would ditch the PT I had and I would've limited my physical therapy efforts. I was still under the false impression that I could PT my way out of the situation, or that I wasn't doing it right, or not doing enough. All of those were wrong. You have to work smart, not hard.
Number one: there are only two routines that are important to early progress. I think when you have slow ROM you have to dump all but the essential routines because any exercise at all rekindles inflammation, and inflammation is the source of adhesions and scar tissue, which are the great inhibitors of ROM.
Routine #1: straight leg lifts. 20 a day
Routine #2: ROM, both straightening and bending. Use your favorite method, 20 a day. These should be very slow, very gentle, to the point of discomfort but not pain and held 60 seconds. I've heard of doing 2 an hour all day, which if I'd known about it I would've preferred to what I did, which was two sets of 10 a day. Ice and elevate afterward.
Routine #3: you must get the swelling & inflammation down which means you have to minimize activity, plus ice & elevate.