I have a similar situation. 8 years post op for TKR on right knee. No symptoms the
Knee was great did everything. Skied, bikes you name it. I was working( officiating a college baseball game, worked 1st game no issues. 2nd game off swelling started. 3 rd game. It blew up. Finished game sat down and after that couldn’t walk on it. No open wounds, no dental work. Mind boggling. Had the same surgery. Clean out pellets picc line for 6 weeks but anti biotics for 4 months not lifetime. Wondering how long your rehab was? I had the new surgery on Memorial Day weekend working it well got flexibility back but still swells and very weak still.