INTRODUCTION
Oxinium femoral, hardness
The occurrence of wear and corrosion at the trunnion‐head interface (trunnionosis) has gained wider recognition as an important clinical matter in metal‐on‐metalOxidized zirconium (Oxinium™) femoral heads were introduced with the prospects of combining the strength of a metal head with the smoothness and hardness of ceramic.In this randomized clinical study, we wanted to evaluate the blood metal ion levels of Oxinium modular femoral heads at 10 years postoperatively and compare this with patients with the CoCrMo modular femoral head counterpart, and the monoblock stainless steel Charnley prosthesis. The null hypothesis was that blood metal ion levels with Oxinium femoral heads were equal to that of the metal heads.