Research Experience 【 display / non-display 】

Research Experience 【 display / non-display 】

• 2014

  　

  　

  Sapporo Medical University   Dept. of Physical Therapy   Professor

• 2009

  　

  　

  Sapporo Medical University   Dept. of Orthopaedic Surgery   講師

Research Areas 【 display / non-display 】

Research Areas 【 display / non-display 】

• Life sciences   Orthopedics  

• Life sciences   Sports science   Sports medicine

Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

• 運動器リハビリテーション

• 後脛骨筋腱

• 整形外科

• 後天性扁平足

• 繰り返し荷重

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Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Biomechanical Comparison of Inside-Out and All-Inside Meniscal Repair in Controlling the Peripheral Gap and Extrusion of the Lateral Meniscus With a Complete Radial Tear: A Cadaveric Study Using a Robotic Simulator.

  Kousuke Shiwaku, Hidenori Otsubo, Katsunori Takahashi, Daisuke Suzuki, Satoshi Yamakawa, Tomoaki Kamiya, Tomoyuki Suzuki, Yohei Okada, Shinichiro Okimura, Kota Watanabe, Hiromichi Fujie, Atsushi Teramoto

  Orthopaedic journal of sports medicine   13 ( 3 ) 23259671241308854 - 23259671241308854  2025.03  [International journal]

  　View Summary

  BACKGROUND: Although both the classical inside-out and all-inside techniques are performed for the repair of complete radial tears, which should be the standard technique is, to the authors' knowledge, controversial considering the clinical outcomes and biomechanical studies. There are no biomechanical studies of repairs of the lateral meniscus (LM) evaluating the peripheral side gap (peripheral gap) of the radial tear site and extrusion of the LM, which seems to be important in the treatment of radial tears. PURPOSE: To compare the inside-out and all-inside meniscal repair techniques by evaluating the peripheral gap and extrusion of the LM with complete radial tear using a 6 degrees of freedom robotic system and fresh-frozen cadavers. STUDY DESIGN: Controlled laboratory study. METHODS: This study was performed using 6 fresh-frozen cadaveric knee specimens, a robotic testing system, and ultrasound evaluation. Ultrasound evaluations were performed to measure peripheral gaps and extrusions. The first ultrasound evaluation under 5 N·m of valgus load was performed on the knee at 30° and 90° of flexion. After a complete radial tear at the midsegment of the LM was created, a second ultrasound evaluation under valgus load was performed. Finally, all-inside and inside-out meniscal repairs done with 1 horizontal suture were performed on the same knee in a randomized order. Subsequently, the third and fourth ultrasound evaluations under valgus load were performed. RESULTS: The peripheral gap of the inside-out meniscal repair technique was significantly smaller than that of all-inside meniscal repairs at knee flexion angles of 30° and 90° (6.0 vs 11.5 mm and 5.6 vs 10.9 mm [both P < .0167], respectively). The extrusion of inside-out meniscal repair was significantly smaller than that of all-inside meniscal repair at a knee flexion angle of 90° (2.6 vs 3.2 mm; P < .0083). CONCLUSION: The inside-out meniscal repair technique showed less peripheral gap and extrusion of the LM in a complete radial tear than the all-inside meniscal repair. Inside-out repair may be advantageous for radial tears over all-inside repair because only inside-out repair can tighten the peripheral side of the radial tear. CLINICAL RELEVANCE: The LM with a complete radial tear should be repaired using the inside-out technique.

  DOI PubMed

• Passive muscle tension changes in the biceps femoris long head after biceps femoris short head detachment: A human cadaver study.

  Gakuto Nakao, Kazuma Yamagata, Risa Adachi, Koki Ishiyama, Kazuyoshi Kozawa, Kota Watanabe, Yuki Ohsaki, Kousuke Shiwaku, Norio Hayashi, Masaki Katayose, Keigo Taniguchi

  Journal of biomechanics   179   112480 - 112480  2024.12  [International journal]

  　View Summary

  The functional role of the biceps femoris short head (BFsh) remains unclear. Clarifying the functional role of each biceps femoris head may provide useful insights into the reduction of biceps femoris long head (BFlh) injuries. This study aimed to clarify whether the passive tension in the BFlh would change with BFsh detachment using cadavers. The shear modulus of the BFlh and BFsh was measured using ultrasonic shear wave elastography as an index of passive tension in three tissue processing conditions (intact, removal of all tissues from skin to deep fascia, and BFsh detachment) in four limb positions, with hip [H0°, H90°] and knee [K0°, K90°] joint angles under each tissue processing condition. The measurement site was the distal 30 % of the line connecting the sciatic tuberosity (100 %) and fibular head (0 %). Three-way analysis of variance was conducted with muscles, tissue processing, and positions as factors, which revealed a significant interaction (P < 0.01). The post-test results indicated that the BFlh was significantly higher than the BFsh at H90° and K0° before tissue processing; however, no difference was observed between the muscles after skin and deep fascia removal. After BFsh detachment, the shear modulus of the BFsh decreased, whereas that of the BFlh significantly increased (P < 0.01), suggesting that the BFsh might be involved in the passive tension reduction of the BFlh in a lengthened position, as the shear modulus of the BFlh increased after detachment.

  DOI PubMed

• 大腿二頭筋短頭の剥離に伴う大腿二頭筋長頭の受動張力変化

  中尾 学人, 谷口 圭吾, 山形 一真, 足立 梨紗, 石山 輝希, 小澤 和祥, 渡邉 耕太, 大崎 雄樹, 林 典雄, 塩泡 孝介, 片寄 正樹, 金谷 耕平

  日本整形外科超音波学会学術集会プログラム・抄録集 ( (一社)日本整形外科超音波学会 )  35回   119 - 119  2024.10

• Validity of Elastic Imaging Evaluation of Hamstring Muscles With Knee Contracture Using Ultrasound Shear Wave Elastography.

  Gakuto Nakao, Taiki Kodesho, Kazuma Yamagata, Kota Watanabe, Yuki Ohsaki, Masaki Katayose, Keigo Taniguchi

  Cureus   16 ( 8 ) e68343  2024.08  [International journal]

  　View Summary

  PURPOSE: This study used ultrasound shear wave elastography (SWE) to evaluate the mechanical properties of hamstring muscles from cadaveric specimens with knee flexion contractures. METHODS: Hamstring muscles for tensile testing were harvested from Thiel soft-embalmed cadavers with and without knee flexion contracture. Muscle specimens were mounted on a testing machine. The initial load detected when a tensile load was applied to the distal end was used as the slack length. The cross-sectional areas of the muscle at slack length were measured at the proximal and distal sites using B-mode ultrasonography. Subsequently, the muscle specimen was elongated from the slack length to 8% strain, with the shear modulus measured using SWE. Young's modulus (stress/strain) was calculated based on the displacement and tensile force obtained from the tensile test. RESULTS: Regression analysis showed a significant positive linear relationship between the Young's and shear moduli for all specimens at all the sites (P < 0.01 and coefficient of determination: 0.95-0.99). The Young's and average shear moduli at the proximal and distal sites were higher in all hamstring muscles with contractures than in those without contractures. CONCLUSIONS: SWE can be used to estimate Young's moduli of hamstring muscles with contractures. Muscle specimens with contractures exhibited higher resistance to elongation, thereby indicating that their mechanical properties differed from those of muscles without contractures.

  DOI PubMed

• 大腿二頭筋長頭の力学的特性 弾性部位差と伸長速度間の応力差

  中尾 学人, 山形 一真, 足立 梨紗, 石山 輝希, 小澤 和祥, 小出所 大樹, 渡邉 耕太, 大崎 雄樹, 片寄 正樹, 谷口 圭吾

  体力科学 ( (一社)日本体力医学会 )  73 ( 4 ) 179 - 179  2024.08

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Misc 【 display / non-display 】

Misc 【 display / non-display 】

• Flexor Hallucis Longus Tendinous Slips and the Relationship to Toe Flexor Function in the Growing Children

  廣田健斗, 渡邉耕太, 宮本浩樹, 谷口達也, 寺本篤史

  日本足の外科学会雑誌   44 ( 1 )  2023

  J-GLOBAL

• Kinematic Alignment TKAにおけるCR型とCS型の術中ギャップの比較

  鍋城尚伍, 岡田葉平, 寺本篤史, 興村慎一郎, 口岩毅人, 堀田和志, 渡邉耕太, 山下敏彦

  日本人工関節学会プログラム・抄録集   52nd (Web)  2022

  J-GLOBAL

• Attune Revision Systemを用いた人工膝関節再置換術における設置位置評価と短期臨床成績

  岡田葉平, 寺本篤史, 鍋城尚伍, 興村慎一郎, 神谷智昭, 堀田和志, 口岩毅人, 渡邉耕太, 山下敏彦

  日本人工関節学会プログラム・抄録集   52nd (Web)  2022

  J-GLOBAL

• Kinematic Alignment TKA術後に膝蓋骨トラッキング不良を呈する術前後因子の検討

  口岩毅人, 岡田葉平, 寺本篤史, 興村慎一郎, 鍋城尚伍, 堀田和志, 渡邉耕太, 山下敏彦

  日本人工関節学会プログラム・抄録集   52nd (Web)  2022

  J-GLOBAL

• Conventional Jigを用いてKinematic Alignment法により両十字靱帯温存型TKAを行った3例

  岡田葉平, 寺本篤史, 鍋城尚伍, 堀田和志, 口岩毅人, 渡邉耕太, 山下敏彦

  日本人工関節学会プログラム・抄録集   52nd (Web)  2022

  J-GLOBAL

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Research Projects 【 display / non-display 】

Research Projects 【 display / non-display 】

• 足・足趾の各筋による3次元関節運動の定量化とそれを用いた新規トレーニング療法開発

  基盤研究(C)

  Project Year :

  2020.04

  -

  2025.03

   

  渡邉 耕太

  　View Summary

  実験を施行してデータ収集を進め、その解析を行った。 一部のデータについては論文化し、英語論文とすべくその作成・英文校正を業者に依頼した。 学会参加により当該研究に関する最新の情報や他施設での研究状況の確認、新たな情報の収集を行った。

• Biomechanical study of the subtalar joint using a three-dimensional robotic joint simulator

  Grant-in-Aid for Scientific Research (C)

  Project Year :

  2013.04

  -

  2017.03

   

  watanabe kota, FUJIE Hiromichi

  　View Summary

  The purposes of this study were to investigate biomechanical characteristics of the subtalar joint and to develop a new ligament reconstruction procedure reproducing normal joint stability and kinematics. A three-dimensional robotic joint simulator was used to repeat joint motion in cadaveric foot specimens. The calcaneofibular ligament has a role to stabilize the subtalar joint. We acquired the data of in situ force and stabilizing contribution of the ligament during joint motion. Using the data we investigated appropriate initial tension of the grafted ligament to achieve normal hindfoot function. As a result, condition of 30 N of the initial tension reproduced joint stability and kinematics closest to the normal condition. These results will contribute to acquire better outcome following treatment of ankle ligament injury by understanding biomechanical characteristics of the ligament and improving operative procedures.

• Biomechanical study of the ankle-hindfoot complex using robotic system

  Grant-in-Aid for Scientific Research (C)

  Project Year :

  2010

  -

  2012

   

  WATANABE Kota, OTSUBO Hidenori, SUZUKI Daisuke, UCHIYAMA Eiichi, KOBAYASHI Takuma

  　View Summary

  The purpose of this study was to evaluate mechanical property of the lateral ligament of the ankle and kinematics of the intact and ligament insufficient ankle model using cadaveric specimens. A 6-DOF robotic system consisting of a custom made 6-axis manipulator with a 6-DOF universal force/moment sensor was used. This study provided important baseline information such as injury mechanism or reconstruction surgeries of the ankle lateral ligament. This information is applicable for decision of the ankle position and tension of the graft during reconstructive surgeries, which will contribute improvement of outcome following surgical treatment of the lateral ligament injury of the ankle joint.

• Pathogenic Mechanism of Acquired Flatfoot-Influence of Obesity-

  Grant-in-Aid for Scientific Research (C)

  Project Year :

  2007

  -

  2008

   

  UCHIYAMA Eiichi, KAMIYA Tomoaki, SUZUKI Daisuke, WATANABE Kota

  　View Summary

  足部への繰り返し荷重システム,制御・解析アプリケーションの開発:万能試験機,LEDマーカとCCDカメラで構成する微小変位解析システム,反復荷重負荷システムと組み合わせによる荷重-変位解析システムの開発を行った. 反復荷重-変位計測システムを用いた実験:正常未固定凍結標本を用い,後脛骨筋力(+)群と後脛骨筋力(一)群(それぞれn=7)で10,000cyclesの負荷試験を行い,足アーチ高の変化を計測した. 結果:足アーチ高は後脛骨筋力(+)群では3,000cycles以降も維持され正常範囲に保たれたが,後脛骨筋力(-)群では低アーチとなり,その後も低下し続け7,000cycles以降は後脛骨筋力(+)群と比べ有為に低下した.足アーチの維持には,骨・靭帯の受動的な構造だけでは十分ではなく,後脛骨筋によるダイナミックなサポートが不可欠であることが分かった.