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The need to optimize adhesion between the femoral stem and surrounding tissue has led to the development of plasma-sprayed HA (PSHA) coatings as attachment facilitators for hip prostheses. The mechanisms underlying this facilitation are incompletely understood, and the long-term efficacy of HA coatings in maintaining bonding to bone remains largely unexplored. in this study, two in vivo models—canine and human—were employed for study by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to elucidate the sequence of early bone mineralization and the longer term fate of HA coatings. High-resolution SEM and TEM of whole bone and anorganic bone were employed to establish the structure of mature bone for comparison.Whole and Anorganic Bone.Anorganic bone derived from bovine trabecular bone was examined in low-voltage field-emission SEM(LV-FESEM) and high-resolution TEM to establish the morphology of the mineral component of bone [1,2]. Trabeculae were seen to comprise oriented fiber bundles (Fig. 1), each fiber comprising an array of oriented apatite platelets (Fig. 2) arranged like a sheared stack of dominoes with approximately the 64-nm stagger of collagen hole zones.