Continued swelling after double total replacement in 2004 and single repacement in 2007

Have had double replacement in 2004, single replacement of left knee in 2007. Five weeks of vancimician while waiting for relplacement in 07.   Right knee quit swelling untill this year,now both are swelling again. My Doc took new x-rays compaired to last time, everything looks good with hardware, sugested getting another opinion. Has anyone ever had this and who could we contact to get it fixed? Have been tested for alergic to metal plastic. Nothing.