Quantitative assessment of joint instability using a capacitive sensor for ankle sprains

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K09208
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 56020:Orthopedics-related
• Research Institution: Sapporo Medical University
• Principal Investigator: Teramoto Atsushi 札幌医科大学, 医学部, 教授 (20404642)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 足関節捻挫 / 足関節外側靭帯損傷 / 足関節不安定症 / 静電容量型センサ素子 / 定量的評価

Outline of Final Research Achievements

In a biomechanics study using cadavers, a capacitance-type sensor was attached to the ankle, and the amount of anterior drawer in an anterior drawer test was measured. Anterior talofibular ligament and calcaneofibular ligament injury models were created and the same measurements were performed. The intra-examiner correlation coefficient was 0.949-0.966, and the intraclass correlation coefficient between three examiners was 0.815.
Clinically, ankle instability was evaluated using capacitance-type sensor in patients. Stress X-rays were taken using the Telos device to apply anterior drawer stress. A Pearson correlation coefficient of 0.843 (p < 0.001, 95% CI 0.65-0.93) was obtained, proving a high correlation between stress X-rays and the capacitance sensor. After alateral ankle ligament repair, the anterior drawer amount measured by the capacitance sensor improved from 10.5 mm preoperatively to 4.6 mm postoperatively.

Free Research Field

整形外科、スポーツ医学

Academic Significance and Societal Importance of the Research Achievements

静電容量型センサ素子による足関節不安定症評価をThiel法固定人体標本を用いた基礎研究と、患者による臨床研究と同時に行った。その結果から、静電容量型センサ素子による足関節不安定性の定量評価の精度が高いことが学術的に証明され、英語論文掲載にいたった。臨床応用も開始され、静電容量型センサ素子が足関節不安定症評価として安全で容易かつ、正確な診断ツールとして期待できるようになった。