Hydroxyapatite is a calcium phosphate mineral that closely resembles the inorganic component of natural bone and teeth. At the nanoscale, hydroxyapatite exhibits high surface reactivity, excellent biocompatibility, and strong osteoconductive properties. Hydroxyapatite nanoparticles are extensively used in biomedical applications such as bone regeneration, dental implants, coatings for orthopedic devices, and as carriers for drug delivery and tissue engineering scaffolds.