['We report the histological findings of a hydroxyapatite orbital implant 5.5 years after implantation.', 'The hydroxyapatite orbital implant was excised from the left orbit of a 17-year-old female, and it was decalcified and processed for routine light microscopic evaluation.', 'The implant showed complete fibrovascularization with nearly complete osteogenesis with hematopoiesis.'] Do osteogenesis in a human hydroxyapatite orbital implant 5.5 years after implantation?