@roodog575 Ouch! This is a journey nobody wants after a joint replacement. You said the doctor tested for metal allergies. Did they also test for allergies to the polymer/plastic they are using, and any glue they might have used?

The only other things I can think of are possibly a temporary drain. Not even sure if it's a "thing" for knees, but it is sometimes done on hip replacements. Or further testing of you bloody drainage to see what it is composed of - that could give a clue to the cause.

Her's hoping your surgeon has someone knowledgeable to consult - there are a few ortho surgeones who specialize in complex cases.