2-Year Radiostereometric Analysis Evaluation of a Short, Proximally Coated, Triple-Taper Blade Femoral Stem Versus a Quadrangular-Taper Stem With Reinforced Proximal Body: A Randomized Controlled Trial.

研究概要

Sixty patients undergoing a total hip arthroplasty were randomized to receive a cementless femoral stem implant using a proximally coated, triple-taper short blade stem (T-stem; n=30) or a quadrangular-taper femoral stem with a reinforced proximal body (POLARSTEM; n=30). The outcomes of interest included migration measured via radiostereometric analysis (RSA), Oxford Hip Scores (OHS), Harris Hip Scores (HHS), EuroQol-5D (EQ-5D) quality of life scores, and the incidence of adverse events. Whilst the total migration was less in the POLARSTEM group, no significant differences in migration on each of the 3 axes were observed between the two groups, and all patient-reported outcomes were similar. 1 case of dislocation and heterotopic ossification were reported in the POLARSTEM group, 1 case of transfusion was reported in the T-stem group. The results of this study suggest that the POLARSTEM and T-stems provide comparable levels of implant migration and clinical outcomes at 2 years.