After endothelial cell attachment test at static and dynamic conditions, the cells were fixed on Non-coated, PCUU coated and PLGA coated alloys surfaces. Electuary distributions of Mg, C and O on surfaces were scanned using EDS. The light blue accumulation area is carbon rich area, indicating the cells or polymer. The red accumulation area is Mg rich area, indicating the corrosion product or bare Mg-alloys surfaces. This distribution of O is associated with Mg and/or C.