Just a little hint . . . the only routine you need now are s-l-o-w g-e-n-t-l-e bends that are held 60 seconds, 2 or more times a day. If you do a total of 20 a day, you could do 2 an hour or, what I did, which was 10 twice a day. If I had known about the 2/hour approach, I would've done that.
Why not other exercises? Any exercise or bending will stir up the inflammation. Is that bad? Well it does seem to go hand and hand with TKR, but the less there is, the less likely for your adhesions to cause you any further trouble. Inflammation is the setting where adhesions take hold. So the goal is to do the minimum routine needed to maintain our ROM progress; the rest of our efforts should focus on calming down inflammation and cooling those areas . . . at least until you're "out of the woods."
I really cannot fathom the "nerve" comment. You will be sore and swollen where adhesions were broken, and above the knee is the classic location for adhesions. Sounds totally normal, and takes time and vigilant efforts to quiet down.