The success of the expected bone development depends on the reliability of the hydroxyapatite (HAp) coating during fixation and the first postoperative phase. The loosening of hip implants in the early stages is mainly attributed to the fretting between the stem and bone. Fretting between the contacting surfaces is caused by the micromotion between the implant and the bone resulting from patient movements. While possessing numerous benefits, HAp is a brittle ceramic material susceptible to cracking when used in highly stressed areas, and therefore titania-added HAp coatings with improved strength are preferred. Bone integration and coating strength depend on the Titania/HAp composition and functionally graded (FG) coatings to meet both requirements from surface to bulk are attempted in the current study. Numerical simulations of the bone-stem interface in actual geometries with different possible loads are carried out to estimate the expected relative displacement in the different regions and identify the critical locations. The composition of the coating was varied as a weight percentage of HAp/Titania (80:20) (Type 1) and HAp/Titania (50:50) (Type 2) in both composite and FG methods. The fretting damage assessment was carried out based on the estimated relative displacements and contact stresses using laboratory-developed test equipment with a ball-on-flat configuration. Reliability of the coatings and damage micro mechanisms are reported based on microscopic observations. The composition of the HAp/Titania graded structure modifies the mechanical bonding and damage mechanisms. ​