I had TKR two years ago. My doctor would not operate if I had a metal allergy unless I went for metal allergy testing. I knew that I had some sensitivity to metal because if I bought cheap earrings, my ears would itch and swell. When I told him this, he sent me for metal allergy testing in Framingham MA (forget the name of the allergist)! I came out very high with an allergy to nickel, along with a few other metals. My orthopedic surgeon’s name is Dr James Bono and he is at the New England Baptist Hospital in Boston MA. He used a knee replacement for me made by “Smith and Nephew”. MaryAnn from MA