Objective To investigate the effects of different-diameter TiO2 nanotubes prepared by anodization on the adhesion,proliferation and osteogenic differentiation of Sprague-Dawley rat mesenchymal stem cells( rMSCs). Methods The isolated rMSCs were characterized by osteogenic differentiation and flow cytometry. TiO2 nanotubes having diameter of 30,70 and 100 nm were fabricated by anodization with different voltages. The topography and hydrophilicity of the nanotubes were accessed with scanning electron microsco...