Abstract: The special properties of bone play an important role in human body. Artificial bone material is very important for the treatment of bone defect. Hydroxyapatite is the main inorganic mineral component of human and animal bones. Chitosan is a na-tural biodegradable polysaccharide. Its degradation product is glucosamine, which is non-toxic and harmless to human tissue. Thus, the combination of hydroxyapatite and chitosan can realize their complementary advantages. Nano-hydroxyapatite/chitosan (n-HA/CS) composites have excellent biological activity, biocompatibility and mechanical properties which can be used as medical materials. In this paper, the main synthesis methods of n-HA/CS composites (such as blending method, co-precipitation method, in-situ preci-pitation method, alternate deposition method and simulated bodily fluid method) in recent years are introduced. On this basis, the research and development of multi-composite materials based on n-HA/CS are also introduced. Finally, the future development direction of n-HA/CS composites is prospected.
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