Yeah, plateaus are normal. Do you have access to a recumbent bike or a Nustep so you can work on your flexibility on your own when you aren't in therapy? It's a very uncomfortable feeling flexing it; almost like there is a wedge in your knee and if you push too hard you'll break something. I would push my knee to flex as hard as I could until I got 1 extra degree and then "tap out". They even had to remind me to breath. I suppose my face was turning blood red. Right now I'm almost at full flexibility and am using a leg press and a modified prayer stretch for the last few degrees.
Today was the first day of "aggressive" PT. Very painful and overall not fun. My goal for this week had been to get 60 and I saw my OS Wednesday who decided on the spot I should be at 75, not 60. So the PT is going nuts expecting to get me to 75. I got to 63 supposedly during a wrestling match with the PT but left feeling like somewhat of a failure. Best take away was the fact that they had a nustep, which I liked because I could commit to a deeper step and control it but also come off of it quickly when the pain hit. Wish I had daily access to that.