Hydroxyapatite is the main inorganic component of human and animal bones. It can achieve chemical bonding with body tissues at the interface, has certain solubility in the body, can release ions harmless to the body, can participate in metabolism in the body, can stimulate or induce bone hyperplasia, can promote the repair of defective tissues, and shows biological activity.

2. Hydroxyapatite is a new bone substitute. Its advantage is that it does not need to be prefabricated into various shapes like cancellous bone, calcium phosphate ceramics and other materials, but can be simply injected into the bone defect and solidified in situ to adapt to the bone defect. It is widely used because of its excellent biocompatibility, non-toxicity, non-irritation, non-rejection, non-aging, non-sensitization, non-carcinogenicity and chemical combination with bone tissue.