Histomorphometrical analysis of tissue-engineered bone-like structures formed by hMSC seeded on silk-RGD scaffolds with small (106–212 μm), medium (212–300 μm) or large (300–425 μm) pore diameters under osteogenic conditions in spinner flask bioreactors after 5 weeks of in vitro culture. Bone volume (A), bone surface per total volume (B), bone surface-to-volume ratio (C), trabecular thickness (D) and trabecular number (E). * Significant difference at p < 0.05, ** significant difference at p < 0.01.