1. State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment, Beijing, 100084, China
2. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
3. School of Aerospace Engineering, Tsinghua University, Beijing 10084, China
et al.
With the increase in the elderly population, the incidence of orthopedic diseases continues to rise, and there is a significantly increasing demand for bone implants. Traditional undegradable bone implants pose great limitations in bone defects treatment. Magnesium, as a degradable metal with excellent biocompatibility and mechanical properties, is recognized as a promising bone implant material. Customized magnesium alloy bone implants fabricated by additive manufacturing can accurately match the patients bone defect shape,and the internal porous structure facilitates new bone growth. However,the current additive manufacturing of magnesium alloy bone implants suffers from the mismatch between the degradation cycle and the bone healing cycle,constraining its application in the field of bone implants. This paper elucidates the additive manufacturing processes for magnesium alloy bone implants and the challenges faced, and outlines strategies for modulating their degradation behavior, mechanical characteristics and biological properties through three primary avenues: composition, structural design, and postprocessing. Finally, the potential research directions and future prospects of magnesium alloy bone implants are proposed.