Erratum to “Clinical and radiological results of a stemmed medial pivot revision implant in aseptic total knee revision arthroplasty” [The Knee 27 (2020) 1190–1196]

Background: Constraint choice in revision total knee arthroplasty depends on the stability of the collateral ligaments and on the severity of bone loss, but the least degree of constraint nec- essary is recommended. The purpose of this retrospective matched-paired study was to com- pare clinical results, radiographic outcome and the survival of a stemmed medial pivot revision implant in aseptic revision TKA vs. medial pivot implant in primary TKA. Methods: Records were reviewed for 69 cases of aseptic revision TKA using Advance® Medial Pivot Stemmed Revision Knee system between 2002 and 2016. These patients were then matched in a 1:2 ratio control group of patients who received a primary TKA with Advance® Medial Pivot system. American Knee Society Score and Visual Analogue Scale pain score were recorded. Alignment, loosening, and incidence of radiolucent lines were evaluated on X-rays. Implant survival was assessed by Kaplan–Meier survival analysis. Results: The primary TKA group had significant superior AKSS clinical and functional score at baseline (52.3 and 68.2 points, respectively) and at last follow up (84.6 and 68.6 points) com- pared with the revision TKA group (47.9 and 40.9 points; 78.4 and 59.9 points; P b 0.05). No significant difference was observed in the mean change from baseline to last follow up of AKSS score between the two groups (P N 0.05). Radiographical outcome and implant survival were similar in the two groups (P N 0.05). Conclusion: The authors support the use of this revision system in knees with collateral liga- ments competence and mild-to-moderate bone defect. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY- NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).