Analysis of the shear strength of a hydroxyapatite (HA)-coated commercially pure titanium (cp-Ti) implant: A in vivo study in pigs

We assess the shear strength of a commercially pure titanium (cp-Ti) implant coated with hydroxyapatite (HA) in the intramedullary canal of miniature pigs' femur. The research involved the utilization of cylinders coated with cpTi-HA, which had an average diameter of 9 mm and a length of 10 mm. The interfacial strength between the bone and the implant reached an ultimate value of 11.32 MPa. The procedure of implantation was performed on three miniature pigs, and the process of osteointegration was assessed using three-dimensional images and histomorphology. In order to examine any detachment, scanning electron microscopy (SEM) was utilized to inspect the complete interface between the implant and the bone. Our discoveries revealed a failure mode that resembled the removal of the femoral stem in a hip revision procedure at the bone-to-bone interface.