the effect of insoles on preventing ankle sprains

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K19533
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 59020:Sports sciences-related
• Research Institution: Hirosaki University
• Principal Investigator: Ishikawa Takaaki 弘前大学, 保健学研究科, 助教 (00782806)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 足関節捻挫 / 慢性足関節不安定症 / インソール / 予防

Outline of Final Research Achievements

We investigated the effect of insole therapy on chronic ankle instability after ankle sprain. No significant kinematic changes due to the use of insoles were observed in any of the walking, landing, and trapdoor drop tests, but a decrease in the maximum hip adduction moment was observed in the landing motion. Although the insole does not change the joint motion immediately, it is considered that the effect of changing the ground contact surface was recognized. In walking, we also examined the coordinated movements of pronation and laterality of the hindfoot and internal and external rotation of the lower leg. As a result, the use of insoles resulted in an increase in the proportion of coordinated movements. We believe that this means that the insole can change the timing of pronation and supination of the hindfoot.

Free Research Field

スポーツ科学関連

Academic Significance and Societal Importance of the Research Achievements

足関節捻挫は最も発生頻度が高い下肢の外傷であり、再発率の高さ、後遺症の残存が生じるため、治療法の開発、予防方法の確立が重要である。本研究ではインソール療法の即時効果の検討を行った。インソールは即時的には足部運動を変化させないが、接地面を変化させ股関節への負荷を変化させること、運動のタイミングを変化させることで協調的な運動を促す効果が認められた。この結果は足関節捻挫後の異常運動を改善させ、長期使用によって足関節捻挫の予防効果が生じる可能性を示唆しており、足関節捻挫の再発予防の一助になると考えられる。