@yorkielover Hello and welcome to Connect. I don't have a knee replacement, but I believe I was allergic to titanium plates I had after an ankle fracture. I had them removed and the pain stopped. I also had hives for months, and that stopped too.

Here is a lab in Chicago where you can have testing for reactions to implants.
https://www.orthopedicanalysis.com/
You can also look at treatment information for implant reactions at this practice. It's founder started the field of environmental medicine. The Environmental Health Center Dallas https://www.ehcd.com/

There is a provider search at this website. https://www.aaemonline.org/