Oxinium Knee Replacement Oxinium is an oxidized Zirconium. The zirconium metal alloy is oxidized through a patented process, which then turns metal surface into the ceramic. Oxinium implants have ceramic-like surface and metal like structure. This metal alloy has a combination of hardness, smoothness and scratch resistance. The ceramic surface of Oxinium metal alloy is two times harder and twice scratch resistance than cobalt-chrome alloys. These additional properties produce less wear than cobalt-chrome alloy prosthesis. Facts about Oxinium: Surface hardness of Oxinium is double that of cobalt – chrome Research studies in labs have shown that prosthesis made from OXINIUM reduces wear by 50%. OXINIUM material is less brittle as compared with ceramic there by can reduce risk of brittle fractures. Nickle content in Oxinium is minimal there by reducing the problems of metal sensitivities in certain patients.