Good afternoon @rknee. You are having some unwanted issues with your "new" knee I see. At three months post-surgery, I would hope for things to have settled down a bit but I know that knees are transplanted into unique different folks with different experiences. I notice that you have had only one knee replaced. What about the other knee? Does the non-surgical knee have the same "pocket of fluid"? Did the surgery knee have a "pocket of fluid" prior to the replacement?

The reason I am asking is that what you described sounds a bit like "Baker's Cyst". It is the way our bodies try to protect us. However, it can become a nuisance. My first effort was to go back to my orthopedic surgeon who did the appropriate imaging and have the fluid extracted prior to the surgery. He told me that the surgery would predominantly take care of it.

Now...that felt pretty "A-OK". Only one problem.....the pocket fills up again as long as there is something to disturb that area of the knee. He did not want me to constantly have to have the pocket drained and so recommended the replacement.

But guess what.....now the other knee, which has had no surgery has a "Baker's Cyst". We are using the MFR to keep it under control as I am not interested in having another knee replacement at this time. Here is the link to the Mayo Clinic discussion of Baker's Cyst.
https://www.mayoclinic.org/diseases-conditions/bakers-cyst/symptoms-causes/syc-20369950
May you be safe and protected from inner and outer harm.
Chris