The metal implant fixation with bone tissues is an important factor for excellent clinical outcomes in total joint arthroplasty. Various porous surfaces produced by additive manufacturing have been developed to enhance bone-implant fixation, and clinically used. However, in some cases, poor fixation of the additively manufactured implants has been reported, because they are not bioactive. In the present study, we focused on the nano-hydroxyapatite as a promising coating material for additively manufactured metal implants. Regardless of surface topographies, nano-hydroxyapatite could be coated on additively manufactured metal surfaces, and nano-hydroxyapatite coated Ti-6Al-4V alloys had high bioactivity.
