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In this study,nano-sized HA powder was employed to fabricate nanocrystalline ceramic by a three-step sintering process.The phase composition,microstructure,crystal dimension and crystal shape of the sintered ceramic were examined by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The phase of the sintered ceramic was pure HA,and the crystal size was about 200 nm.The good fatigue strength overcame brittleness of traditional sintered HA ceramics.Cell attachment experiment also demonstrated the ceramics had a good cytocompatibility.