@cobweb: I thought I remembered you mentioning PRP at some point, and I’m glad it worked for you. As I mentioned, not that my second knee is about to go bad - based on time progression between shoulder surgeries (right-left),
I have about 3 years left - but I’m with you to not want another TKR, even though mine was average in pain, above average in mobility. And compared to permanent limited artificial knee functions, the money seems worth it if one can keep the old knee in working order without too much pain.