“…One is that the rate of degradation of magnesium and its alloys in the physiological environment exceeds bone healing rate, and the other is their low biological activity. 4,5 Many strategies have been adopted to improve the biological activity and corrosion resistance of Mg-based alloys, such as development of Mg-Ca alloys, and exploration of new casting techniques and coatings. [6][7][8] Bioactive coatings, especially calcium-phosphorus (CaP) coatings, which are similar to the main mineral components of human bones, not only acts as a barrier layer, but also promote the growth of natural bone cells.…”