TKR 13 months extreme swelling

My TKR was done over a year ago. The swelling has never went down. Knee was drained several times after it was healed. I just had a bone scan. Nothing is loose and it seems to look fine. The surgeon has scheduled me to have the inner lining replaced called a poly exchange. Or if needed once in there possibly a revision. Has anyone had this? I’m super nervous about a 2nd surgery with the healing process then possibly another fail!