Maybe this will help. This is one of the TKR range of motion charts and what those ranges mean in terms of functionality. Replacements are not meant to move more than 135 degrees according to my surgeon. A normal knee may go to 155 (your heel can touch your butt).

I had less than 105 before the lysis. It’s at 132 now when the PT measures it - BUT that is a passive measurement - meaning I have to hold it there with a strap or the PT holds it. It’s painful. On my own active - I’m somewhere between 120 and 125 - meaning no holding. For me the goal is 130 active with no pain since that is my passive maximum.