The biocompatibility is necessary for the Co-Cr alloy used as an artificial femoral head material. Then, the ELID (Electrolytic In-Process Dressing) grinding is paid to attention as a method of the surface modification and the processing. We focus on the grinding fluid as a factor to control the biocompatibility, and considered the influence that the grinding liquid element exerted on the cell bonding on the surface of the material. As a result, the biocompatibility on the surface of the material has improved when processing it with the grinding fluid with high electric conducitivity.
