The corrosion and hydrogen evolution rates of Mg/HA/TiO2 bionanocomposite were decreased by increasing TiO2 content. Nanoflakes of MgTiO3 were synthesized on the sintered-Mg/HA/TiO2 bionanocomposites by MSR mechanism. The compressive failure strain of Mg/HA/TiO2 bionanocomposites increased as wt% HA decreased. Cell viability was decreased by decrease in HA content of Mg/HA/TiO2 bionanocomposites.