I am curious to learn what your doctor recommends after seeing him if you wish to share because putting in a different size knee does not address your scar tissue build up. You will have new scar tissue from the new replacement and will require to start all over again with PT. If it's just scar tissue, there are a number of ways to break it up. You are past the time frame, I believe, for an MUA but there are other ways like the ones you've mentioned.