An investigative study of single-limb hopping movement capability in athletes after anterior cruciate ligament reconstruction.

• Project/Area Number: 17K13050
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Rehabilitation science/Welfare engineering
• Research Institution: Tokyo Medical and Dental University
• Principal Investigator: Hirohata Kenji 東京医科歯科大学, 医学部附属病院, 理学療法士 (90747700)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 膝前十字靱帯再建 / 垂直連続ホッピング / Reactive strength index / 下肢対称性 / スポーツ復帰許可基準 / 膝前十字靱帯再建術 / 片脚垂直連続ホッピング / 下肢対称性指数 / 膝前十字靱帯 / 片脚連続垂直ホッピング / 伸張-短縮サイクル運動能力 / 片脚跳躍能力 / 片脚ホッピング / 敏捷性評価 / 前十字靭帯再建術 / 敏捷性 / Reactive Strength / 片脚ホッピング動作 / パフォーマンス

Outline of Final Research Achievements

The reaction strength index (RSI) is an index calculated from the ground contact time and jump height during jump task. It is one of the indicators of the ability to jump.In current study, RSI during single-limb vertical continuous hopping and the existing single-limb hop tests were measured in ACL reconstructed athletes and healthy athletes.The validity of RSI during single-limb vertical continuous hopping as an assessment of jumping ability on the reconstructed limb was investigated by comparing data from healthy athletes with those from ACL reconstructed athletes.
The results of this study suggested that assessment of RSI during single-limb vertical continuous hopping in ACL reconstructed athletes who are in the phase of considering the timing of return to sport could capture the deficit of jumping ability on reconstructed limb, which cannot be extracted by previous tests of jumping ability.

Academic Significance and Societal Importance of the Research Achievements

これまで，ACL再建術後選手のスポーツ復帰のタイミングを判断するテストとして，前方や側方へ跳ぶ様な跳躍テストは頻繁に取り上げられてきたが、垂直方向へ跳躍するテスト自体が用いられる事自体が少ない．ACL再建術後選手の片脚垂直連続ホッピング中のRSIに着目して調査した研究はない．本研究は、片脚垂直連続ホッピング中のRSIを，ACL再建術後選手のスポーツ復帰のタイミングを判断するための新たな指標に加えるための基盤となる研究である。

Research Products

• [Journal Article] 片脚垂直連続ホッピングにおけるReactive strength index計測の再現性 (2020)
  • Author(s): 廣幡健二、相澤純也、大見武弘、大路駿介、柳下和慶
  • Journal Title: 日本臨床スポーツ医学会誌 Volume: 28 Pages: 291-297
  • NAID: 40022253284
  • Peer Reviewed
• [Journal Article] The Japanese version of the anterior cruciate ligament - return to sport after injury (ACL-RSI) scale has acceptable validity and reliability. (2020)
  • Author(s): Kenji Hirohata,Junya Aizawa,Hidetaka Furuya,Sho Mitomo,Takehiro Ohmi,Shunsuke Ohji,Toshiyuki Ohara,Hideyuki Koga,Kazuyoshi Yagishita,Kate Webster
  • Journal Title: Knee Surgery, Sports Traumatology, Arthroscopy Volume: 未定
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 講座 運動器の理学療法-その常識は正しいか?･3 足関節内反捻挫はトレーニングによって再発予防が可能か? (2019)
  • Author(s): 廣幡 健二、相澤 純也
  • Journal Title: 理学療法ジャーナル Volume: 53 Issue: 11 Pages: 1115-1125
  • DOI: 10.11477/mf.1551201724
  • ISSN: 0915-0552, 1882-1359
  • Year and Date: 2019-11-15
• [Presentation] ACL再建術後選手と健常選手における片脚垂直連続ホッピング中の反応筋力指数の非対称性 ～片脚ホップテストとの比較を含めた分析～ (2019)
  • Author(s): 廣幡健二, 相澤純也, 大見武弘, 大路駿介, 柳下和慶
  • Organizer: 第6回スポーツ理学療法学会学術大会
• [Presentation] Asymmetry of reactive strength index during single-leg vertical hopping in anterior cruciate ligament reconstructed athletes. (2018)
  • Author(s): KENJI HIROHATA, Junya Aizawa, Takehiro Ohmi, Shunsuke Ohji, Toshiyuki Ohara, Kazuyoshi Yagishita
  • Organizer: 2018 AOACOE_APKASS
  • Int'l Joint Research
• [Presentation] Asymmetry in the reactive strength index during single-leg vertical hopping in anterior cruciate ligament-reconstructed athletes (2018)
  • Author(s): 廣幡健二
  • Organizer: AOA Continuing Orthopaedic Education and APKASS Congress
  • Int'l Joint Research