The deterioration of bone cartilage in hip joints caused by osteoarthritis and rheumatoid arthritis is the most prevalent cause of total hip replacement. The femoral stem in the implant is fixed to the bone at the time of surgery. It is coated with biocompatible ceramics such as hydroxyapatite (HAp) to enable faster bone growth. The coating experiences relative motion during the initial period, before sufficient bone growth occurs, and loosens in many cases. Suspension plasma-sprayed hydroxyapatite (HAp)-based coatings such as HAp/Titania on titanium substrates have been proven suitable for both mechanical properties and biocompatibility. Slip occurs primarily at the coating and metallic implant interface (the bonded interface), accelerating the coating damage due to fretting. The current investigation is directed at understanding the influence of assembly load, coating property, and delamination length on the interface strength between coating and implant. A two-dimensional finite element model of a 170 mm-long femoral stem coated with HAp/Titania coating is analyzed using commercial software. The geometrical model is like the original joint condition of the human hip implant. The numerical analysis showed that the first contact edge is where the most stress and contact slip happen because that is where the stress is concentrated during an assembly loading condition. The variation in load and contact slip conditions will result in coating failure in the implant.