HA coating significantly increased ER of cells as compared with uncoated (p b 0.001) and HA/ZrO2-coated SiC ceramics (p b 0.01). The presence of HA/ZrO2 coating increased the ER values of 3T3 cells as compared with uncoated SiC ceramics, however the values were not statistically significant significantly (p = 0.47).