Validating Knee Varus Alignment Measurements Using Markerless Motion Capture

Kensuke Todoriki; Yoshihiro Kai; Shogo Mukai; Shin Murata

doi:10.3390/geriatrics8060109

Validating Knee Varus Alignment Measurements Using Markerless Motion Capture

Geriatrics (Basel). 2023 Nov 3;8(6):109. doi: 10.3390/geriatrics8060109.

Authors

Kensuke Todoriki¹, Yoshihiro Kai², Shogo Mukai³, Shin Murata²

Affiliations

¹ Graduate School of Health Sciences, Kyoto Tachibana University, Kyoto 607-8175, Japan.
² Department of Physical Therapy, Faculty of Health Sciences, Kyoto Tachibana University, Kyoto 607-8175, Japan.
³ Department of Orthopedic Surgery, National Hospital Organization Kyoto Medical Center, Kyoto 612-0861, Japan.

Abstract

This study aimed to determine the validity of specific knee varus alignment measurement methods. We measured the femorotibial angle (FTA) using radiography and optical motion capture and validated the FTA measurement using markerless motion capture. The subjects included 34 legs of 19 patients with knee osteoarthritis (OA). One-way analysis of variance and multiple comparison tests were used to compare the FTA values between the Kellgren-Lawrence classification (KL) and Pearson's correlation coefficient for validity. The analysis showed that the FTA measured by markerless motion capture had a significant correlation to the FTA measured by radiography (r = 0.869, p < 0.01) and significantly increased with increasing KL (p < 0.05). These results indicate that markerless motion capture is a valid outcome measure for varus alignment in patients with knee OA.

Keywords: femorotibial angle; markerless motion capture; validity.

Grants and funding

This research received no external funding.