I had a RTKR in April 2018. My the end of May, I had so much scar tissue that I couldn’t even get up from a seated position ir extend my leg without excruciating pain and crepitus. Scar tissue had frozen my patella, and the ROM was nearly non existent. Had an arthroscopic lysis of adhesions yesterday, and actually feel better despite the surgical pain and swelling. Now on a mission to find out what caused the problem and keep it from happening again!