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Knee Surg Relat Res. 2018 Mar;30(1):23-27. English. Original Article. https://doi.org/10.5792/ksrr.17.042
Cho KY , Kim KI , Song SJ , Kim KJ .
Department of Medicine, Graduate School, Kyung Hee University, Seoul, Korea.
Department of Orthopaedic Surgery, Center for Joint Diseases and Rheumatism, Kyung Hee University Hospital at Gangdong, Seoul, Korea. drkim@khu.ac.kr
Department of Orthopaedic Surgery, Kyung Hee University College of Medicine, Seoul, Korea.
Abstract

Purpose

The purpose of this study was to determine the results of mobile bearing unicompartmental knee arthroplasty (UKA) with an intentionally increased flexion angle of the femoral component in patients requiring high flexion.

Materials and Methods

We investigated 45 knees treated by UKA. Clinically, we measured the range of motion (ROM) and the American Knee Society (AKS) score preoperatively and at final follow-up and investigated complications. Radiologically, we measured the flexion angle of the femoral component, the posterior slope angle of the tibial component, the femorotibial angle and mechanical axis of the limb postoperatively.

Results

The ROM was increased from 123° preoperatively to 139° at the final follow-up. The AKS knee and function scores increased from 59 and 68, respectively, preoperatively to 94 and 96, respectively, at the final follow-up. The flexion angle of the femoral component was 9.1°, and the posterior slope angle of the tibial component was 8.6°. There was one case of bearing dislocation in the largest femoral flexion angle case.

Conclusions

The results might reflect the positive effect of an increased flexion angle of the femoral component up to 10° on ROM in mobile bearing UKA, which would contribute to better quality of life after UKA especially in populations requiring deep knee flexion.

Copyright © 2019. Korean Association of Medical Journal Editors.