I have learned that I am allergic to Nickel, and Cobalt. Surgical Stainless is 18 to 30% nickel, and 3 or 4 % cobalt. That's what my artificial knee is made of..... Going in for "Revision Surgery" November 18th to replace perfectly good components, with parts made of Zirconium and Ceramic. Third time for this surgery in 22 months.... Ay Carumba! Will be going through the same therapy again for 3 to 4 months. We're real confident that the metal allergy has been the culprit keeping me in pain and inflamed all this time, so this is supposed to "FIX" the problem. Look up Smith and Nephew total knee replacement to see what Oxinium is all about, if interested...