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Validation of posturography analysis in patients undergoing surgery for chronic ankle instability
Arthrosc Orthop Sports Med 2022;9:41-48
Published online November 1, 2022;  https://doi.org/10.14517/aosm22015
© 2022 Korean Arthroscopy Society and Korean Orthopedic Society for Sports Medicine.

Byung Min Yoo, I Sac Kim, Sung Hyun Lee

Department of Orthopedic Surgery, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan, Korea
Correspondence to: Sung Hyun Lee, https://orcid.org/0000-0001-6468-1456
Department of Orthopedic Surgery, Wonkwang University Hospital, Wonkwang University School of Medicine, 895 Muwang-ro, Iksan 54538, Korea. Tel: +82-63-859-1360, Fax: +82-63-852-9329, E-mail: kensin06@hanmanil.net
Received July 11, 0222; Revised October 7, 2022; Accepted October 12, 2022.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: Evaluation of the function of patients with chronic ankle instability (CAI) in clinical settings is important not only to identify the damage severity but also to evaluate the treatment effectiveness and prevent recurrence. However, objective diagnostic indicators for evaluating the functional stability of CAI are uncommon. This study aimed to determine the validity of the posturography test as an objective indicator of functional instability in relation to the Foot and Ankle Outcome Score (FAOS) and modified Star Excursion Balance Test (mSEBT) following the modified Broström procedure for CAI.
Methods: A retrospective study was conducted on patients who underwent CAI surgery and posturography before and 1 year after surgery. The FAOS was measured as subjective result and the mSEBT as objective result. Posturography analysis using Tetrax devices was conducted to measure fall risk and general stability index. The difference between the measured fall risk and general stability index before and after surgery was compared with that between FAOS and mSEBT before and after surgery.
Results: A total of 87 patients were evaluated. Their average age was 32.2 years, and the average follow-up period was 29.6 months. The differences in the fall risk before and after surgery, measured via posturography, were associated with FAOS pain, sports activities, daily life activities, quality of life, and mSEBT. In addition, the differences in the general stability index before and after surgery, measured via posturography, were associated with mSEBT.
Conclusion: In the posturography, the fall risk and general stability index exhibited a weak negative correlation with mSEBT. In addition, the fall risk demonstrated a weak negative correlation with the FAOS, which is a subjective result. These findings indicate that posturography using Tetrax devices is a useful and reliable tool for the objective evaluation of the functional stability of patients with CAI.
Keywords : Ankle; Joint instability
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