Co-based alloys such as vitallium (CoCrMo) have attracted a lot of attentions among the typical biomaterials for bone and joint replacements. However, the main defects of vitallium alloys are their bio inactivity and higher mechanical properties compared with bone for under loading implants applications. The usage of porous materials is a method to solve mismatch between elastic modulus of this alloys and human bone tissue. elastic modulus can be decreased by increasing porosity. Co-based alloys like the other metallic biomaterials get catagorized into bioinert materials, on other hand bioglasses and bioceramics such as 58S bioglass (58%Si, 38% CaO and 4%in molar percentage) get catagorized as bioactive materials because they can directly interact to soft and hard tissues. These materials can solve the resultant problems of bioinert Co-based alloys by coating. The porosities of the fabricated Co-based porous alloys were 45%, and the sizes of open cellular pores were 25-470 ?m. The compression strength and elastic modulus of this samples are measured to 84.7 MPa and 0.6 GPa, respectively .The in vitro tests showed that hydroxyl carbonate apatite was precipitated on coating 21 days after immersed in a simulated body fluid. In vitro cytocompatibility of the sample was evaluated and cell growth was examined. SEM images revealed that cells grew on the surface and inside the pores.
