Hydroxyapatite (HA) coating on titanium based implants has been shown to significantly enhance early wound healing, level of bone apposition and osteoconduction. Direct bonding of bone to the metal substrate is envisioned after resorptIon of HA and bone remodeling. This is expected due to the chemical similarity of synthetic HA to bone mineral. A variety of HA-coated implant designs incorporating surface macrostructure (topography, roughness, etc.) and microstructure (crystallinity, porosity and microroughness) level are available commercially. The objective of this study was to characterize the macro and microstructure of three-plasma spray coated commercial three implant designs. Material and method Three HA-coated implants, 3I implant (3I, Implant Innovation Inc.), Calcitek (Sulzer Calcitek Inc.) and Steri-Oss (Steri-Oss Inc.) were evaluated. Scanning electron microscope (JEOL, Model JSM 5400) was used to observe surface and cross sectional macro and microstructure and recorded. Coating thickness from various locations was measured from micrographs. Hardness measurements were performed on sectioned samples, using a hardness testing machine (Tukon hardness tester). Geometry relating to implant design was measured using a Nikon Profile Projector (Nikon, V12 Projector). Result: SEM observation revealed significant differences in macro and microstructures. Significant differences in thickness of plasma sprayed HA coating were noted both as a function of implant type and location in the non-symmetrical geometry of the thread regions. There was a morphological difference in the microstructure of the metal. Conclusion: Plasma sprayed HA on threaded implant shows significant difference in coating thickness. Macrostructure has an effect on the coating thickness. Qualitative differences due to difference in processing parameters were also identified in the HA coating.