The regeneration and repair of damaged load-bearing segmental bone requires considerable mechanical strength for the artificial implants. The ideal biomaterials should also facilitate the production of porous implants with high bioactivity desirable for stimulating new bone growth. Here we developed a new mechanically strong, highly bioactive, dilute magnesium-doped wollastonite (CaSiO3-Mg; CSi-Mg) porous scaffold by the robocasting technique. The sintered scaffolds had interconnected pores of 350 μm in size and over 50% porosity with appreciable compressive strength (>110 MPa), 5−10 times higher than those of pure CSi and β-TCP porous ceramics. ...