I feel for you I have had two surgeries on same knee so far … it is exhausting….i still have pain and tightness …. I am going for Ltt blood test trying to find answers …. I was going to the gym 5 days a week had to stop was hurting my other knee and I am not doing this again …. I am now doing a lot of stretching …. I know you have failing parts how about myofascial release it might help with some of the pain , because I am sure the tissue around the implant is inflamed so it may help calm it down …. I do myofascial it does help …. My daughter is into a lot of the natural healing for my birthday she gave me castor oil ….. she told me to put this on a pad put on my knee wear it will get deep into the tissue break up the scar tissue….so this is what I am doing now just started so let you know …. Good luck let me know how it goes