hI @timb - Welcome to Connect! I am so sorry to hear of all the problems you have had with your knee replacement. I can imagine that it must be terribly discouraging and scary. I'm glad you are signed in on this thread. I know there have been a number of members who have commented on problems with scar tissue, difficulties with MUA's and other complications. I'm going to tag a few members to see if they can share any insight on the arthroscopic scar tissue removal: @JustinMcClanahan, @doodles418 and @babette . Also, here is an article that might help:
https://www.healthline.com/health/total-knee-replacement-surgery/arthrofibrosis#outlook
With that much swelling, it's interesting that you still have great ROM! How is your pain? and your mobility? I can imagine that it must be affecting your ability to go about your normal activities.