Excellent Longterm Survival and Good to Excellent Functional Outcomes of a Fully HydroxyapatitCoated Cementless Stem: Results of a Prospectiv Study

Purpose: Although the reports of the National Joint Registries in the United Kingdom and Germany report excellent survivorship for the cementless Polarstem, no prospective longterm studies have been published focusing on both its efficacy and clinical performance.Therefore, the present study was designed to prospectively evaluate the functional and radiographic outcomes over 10 years.Methods: Seventy five patients were included prospectively.Anteroposterior and lateral radiographs were obtained at each followup (3 months, and 1, 3, 5 and 10 years).Survivorship, the Harris Hip Score (HHS) and Hip disability and Osteoartritis Outcome Score (HOOS) were calculated.Results: Subjects experienced statistically significant improvements from baseline in mean HHS and HOOS scores at all intervals.The stem survivorship was 100% at 10 years with stem revision due to any reason.There were no observed cases of mechanical failure of the stem or signs of radiographic loosening. Conclusion:A revision rate of the femoral stem for any reason of 0%, as well as good to excellent clinical results based on HHS and HOOS scores, were noted at 10-year follow-up.Therefore, safety and efficacy of the cementless Polarstem at longterm follow-up is confirmed.