Patellar resurfacing in total knee arthroplasty leads to better isokinetic performance

Abstract

Background: For decades there have been concerns about patellar resurfacing (PR) in total knee arthroplasty (TKA) and the individual preference of the surgeon is still the main determinant of whether or not resurfacing is applied. According to preference, surgeons can be categorized in 3 main groups of those who usually, selectively, or rarely resurface. The aim of this prospective, randomized, controlled study was to compare the isokinetic performance and clinical outcome of TKAs with PR and without PR. Methods: A total of 50 patients scheduled to undergo TKA for primary osteoarthritis of the knee were randomly assigned to either the PR or non-PR groups. There were no significant differences between the groups in respect of age, BMI, gender and preoperative Knee Society Score (KSS) and isokinetic perfor-mance. Patients were evaluated at postoperative 3, 6, and 12 months with KSS and at 6 months and 1 year with isokinetic measurements.Results: The PR group had a higher mean score, especially in the functional component of KSS, but the difference was not statistically significant. Knee extension peak torque was significantly higher in the PR group at 6 months (p = 0.029) and 1 year (p = 0.004) postoperatively. There were no significant dif-ferences between the groups in respect of knee flexion peak torque values following TKA. Conclusions: The results of this study demonstrated that PR during TKA is associated with better iso-kinetic performance and higher knee scores. These results support routine/usually resurfacing of the patella. For surgeons who selectively resurface the patella, the advantage of better isokinetic perfor-mance may be taking into consideration in favor of resurfacing the patella where they are undecided. Level of evidence: Level I, therapeutic study.& COPY; 2021 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.