@gardeningjunkie I don’t blame you for canceling your surgery. If someone can’t give you a 100% guarantee about those metals, I wouldn’t take the chance either. When I was a teenager and had my ears pierced, my ears would always become red and swell from cheap earrings. My surgeon had a paper that you had to sign if you thought you had a metal allergy. I told him about the earrings and he sent me for “metal allergy testing”. They tested for a lot of different types of metals along with an alergy to the bone cement. The allergy to nickel came out *very* high and a few other metals came back with a small reaction but the allergist told me that the smaller reactions were nothing to worry about. I don’t know what the replacement is made from but the brand name is “Smith and Nephew”. That replaced knee still bothers me……..it’s not pain-free! Glad that you canceled your surgery because if you ever had a reaction, they would have to take the replacement out and start all over again!