Purpose Our goal was to evaluate the five-year follow-up results of the Scorpio single radius total knee arthroplasty. Method We performed a retrospective study based upon a multicentre database to evaluate the minimum five-year follow-up clinical and radiological results of 747 patients (831 knees) who underwent primary Scorpio single radius total knee arthroplasty. Results The mean age of the patients was 71.9 years. At a minimal five-year follow-up, 141 patients were lost to follow-up, 83 patients had died, eight patients had undergone revision of a component, and the remaining 589 patients (602 knees) had a complete clinical and radiological evaluation after a median of six years (range, 5-8). The mean clinical component of the knee score was 92.2 points, and the mean functional component of the knee score was 76.9 points. At last follow-up, 530 of the 602 knees were rated as excellent or good. Only four knees developed patellar complications requiring revision. The survival rate at six years was 95.2%±1.9% and 98.3%±0.6 with revision for any reason and revision for mechanical failure as the end point, respectively. Conclusion This medium-term study indicates favourable clinical and radiological results for this single flexionextension radius design arthroplasty, with a low complication rate on the patellar side.

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