Papers - TERAMOTO Atsushi

High Tibial Osteotomy Alone Does Not Decrease Medial Meniscus Extrusion in the Setting of Medial Meniscus Posterior Root Tear: A Cadaveric Study

Kazushi Horita, Yohei Okada, Kousuke Shiwaku, Satoshi Yamakawa, Yuta Mori, Tomoaki Kamiya, Makoto Emori, Kota Watanabe, Hiromichi Fujie, Atsushi Teramoto

Arthroscopy: The Journal of Arthroscopic & Related Surgery    2025.05

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The In Situ Force and Contribution of Each Ligamentous Band of the Deltoid Ligament in Ankle Joint Stability: A Cadaveric Biomechanical Study

Katsunori Takahashi, Atsushi Teramoto, Yasutaka Murahashi, Kousuke Shiwaku, Tomoaki Kamiya, Makoto Emori, Kota Watanabe, Hiromichi Fujie

Orthopaedic Journal of Sports Medicine    2025.04

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Biomechanical effects of fascial hydrorelease: a cadaveric study

Kousuke Shiwaku, Hidenori Otsubo, Daisuke Suzuki, Calmero Pirri, Taiki Kodesyo, Tomoaki Kamiya, Keigo Taniguchi, Hirofumi Ohnishi, Atsushi Teramoto, Carla Stecco

BMC Musculoskeletal Disorders ( Springer Science and Business Media LLC )  26 ( 1 )  2025.03

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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]

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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

All-Inside Arthroscopic Anatomic Anterior Talofibular Ligament Repair for Chronic Lateral Ankle Instability and Injury at the Talar Attachment: Surgical Technique

Nanami Ueda, Yasutaka Murahashi, Katsunori Takahashi, Yuta Mori, Kota Watanabe, Makoto Emori, Atsushi Teramoto

Arthroscopy Techniques    2024.11

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Intravenous Infusion of Autologous Mesenchymal Stem Cells Expanded in Auto Serum for Chronic Spinal Cord Injury Patients: A Case Series

Ryosuke Hirota, Masanori Sasaki, Satoshi Iyama, Kota Kurihara, Ryunosuke Fukushi, Hisashi Obara, Tsutomu Oshigiri, Tomonori Morita, MASAHITO NAKAZAKI, Takahiro Namioka, Ai Namioka, Rie Onodera, Yuko Kataoka-Sasaki, Shinichi Oka, Mitsuhiro Takemura, Ryo Ukai, Takahiro Yokoyama, Yuichi Sasaki, Tatsuro Yamashita, Masato Kobayashi, Yusuke Okuma, Reiko Kondo, Ryo Aichi, Satoko Ohmatsu, Noritaka Kawashima, Yoichi M. Ito, Masayoshi Kobune, Kohichi Takada, Sumio Ishiai, Toru Ogata, Atsushi Teramoto, Toshihiko Yamashita, Jeffery Kocsis, Osamu Honmou

Journal of Clinical Medicine    2024.10

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Supra over the top ACL再建術の生体力学的解析 Single versus double tibial tunnels

塩泡 孝介, 鈴木 智之, 史野 根生, 大坪 英則, 山川 学志, 興村 慎一郎, 鈴木 大輔, 鍋城 尚伍, 神谷 智昭, 藤江 裕道, 寺本 篤史

日本整形外科学会雑誌 ( (公社)日本整形外科学会 )  98 ( 8 ) S1789 - S1789  2024.09

Remission of hypersensitivity by simple weight load stimuli in a complex regional pain syndrome mouse model

Kenta Kiyomoto, Makoto Emori, Megumi Hanaka, Atsushi Teramoto, Hikaru Hayakawa, Kenichi Takashima, Toshihiko Yamashita, Kousuke Iba

Journal of Orthopaedic Research    2024.05

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The Accuracy of Cup Placement in Total Hip Arthroplasty (THA) Using an Augmented Reality-Based Navigation System.

Junya Shimizu, Satoshi Nagoya, Ima Kosukegawa, Arata Kanaizumi, Naoya Nakahashi, Atsushi Teramoto

Cureus   16 ( 4 ) e59423  2024.04  [International journal]

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Background AR HIP Navigation System® (AR-navi; Zimmer-Biomet, Warsaw, IN) is a portable navigation system employing augmented reality via a smartphone app, which was developed in Japan. We retrospectively analyzed the accuracy of cup placement in total hip arthroplasty (THA) using AR-navi, to investigate whether obesity is associated with an absolute value error in cup placement angle. Methods We retrospectively analyzed 45 hips in 43 patients who underwent THA using AR-navi (AR-navi group) and compared them with 45 hips in 45 patients who underwent THA using alignment rods (conventional group). Results The mean absolute error of cup placement (AR-navi group vs. conventional group) was found to be 2.60° (±2.11) in radiographic inclination (RI) for the AR-navi group and 4.61° (±3.28) for the conventional group, which indicates significant difference in the AR-navi group compared to that in the conventional group (p = 0.0036). The mean absolute error of radiographic anteversion (RA) was 3.57° (±3.36) for the AR-navi group and 3.87° (±2.97) for the conventional group (p = 0.4732). The mean absolute error of RI was 2.36° (±2.24) in the obese group and 3.16° (±2.03) in the nonobese group, and the mean absolute error of RA was 4.08° (±4.51) and 3.16° (±2.05) in the obese and nonobese groups, respectively. Conclusions Cup placement accuracy for THA using AR-navi was 2.60 ± 2.11° for RI and 3.87 ± 2.97° for RA. Compared to THA using the conventional method, the RI installation error was significantly improved with AR Navi. There was no significant difference in the mean absolute error of RI and RA among the obese and nonobese groups.

DOI PubMed

Characteristics of Nonunion After Arthroscopic Ankle Arthrodesis: A Multicenter Retrospective Cohort Study

Katsunori Takahashi, Atsushi Teramoto, Satoshi Yamaguchi, Kentaro Amaha, Kenta Saiga, Koji Noguchi, Kota Watanabe

The Journal of Foot and Ankle Surgery    2024.03

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ハムストリングスの局所的な力学特性 Thiel法固定献体を用いた検討

中尾 学人, 谷口 圭吾, 小出所 大樹, 山形 一真, 渡邉 耕太, 大崎 雄樹, 片寄 正樹, 寺本 篤史

日本整形外科学会雑誌 ( (公社)日本整形外科学会 )  98 ( 3 ) S1379 - S1379  2024.03

せん断波イメージングを用いた筋の粘弾性評価 静的ストレッチングの効果検証と関節可動性との関係

小出所 大樹, 谷口 圭吾, 中尾 学人, 山形 一真, 渡邉 耕太, 片寄 正樹, 寺本 篤史

日本整形外科学会雑誌 ( (公社)日本整形外科学会 )  98 ( 3 ) S1359 - S1359  2024.03

内側半月後角損傷の膝関節前方安定性への影響 未固定凍結遺体とロボットシステムを用いて

塩泡 孝介, 神谷 智昭, 鈴木 大輔, 山川 学志, 大坪 英則, 鈴木 智之, 高橋 克典, 岡田 葉平, 藤江 裕道, 寺本 篤史

日本整形外科学会雑誌 ( (公社)日本整形外科学会 )  98 ( 3 ) S1298 - S1298  2024.03

Comparison by ultrasound shear wave elastography of toe flexor muscle contraction during MTP flexion exercise and short-foot exercise

Kento Hirota, Kota Watanabe, Hiroki Miyamoto, Keisuke Negishi, Mako Watase, Atsushi Teramoto

Journal of Back and Musculoskeletal Rehabilitation ( IOS Press )    1 - 7  2024.02

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BACKGROUND: The intrinsic foot muscles play an important role in medial longitudinal arch support, as well as several extrinsic foot muscles. While various strength training methods specific to intrinsic foot muscles have been conducted, these exercises are associated with certain concerns regarding their effectiveness and difficulty. We developed a new exercise for the intrinsic muscles (MTP flexion exercise). OBJECTIVE: The aim was to compare the shear modulus of the toe flexors as the muscle contraction activity during MTP flexion and short-foot exercises using ultrasound shear wave elastography. METHODS: Eleven healthy participants were included in this study. The shear modulus of the toe flexor muscles was measured during MTP flexion and short-foot exercises using ultrasound shear wave elastography. The muscle shear modulus was statistically compared between the resting phase, and during the two exercises. RESULTS: The shear modulus during MTP flexion exercise was significantly greater than in the resting phase in the abductor hallucis, flexor hallucis brevis, flexor digitorum brevis, quadratus plantae, and flexor digitorum longus. The flexor digitorum longus showed greater shear modulus during MTP flexion exercise than during short-foot exercise. CONCLUSION: MTP flexion exercise showed equivalent or greater contraction activity in certain intrinsic and extrinsic foot muscles when compared with short-foot exercise. This exercise is considered one of the training options for strengthening the intrinsic muscles of the foot.

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Platelet-rich plasma does not accelerate the healing of damaged muscle following muscle strain.

Hiroyori Fusagawa, Takashi Yamada, Tatsuya Sato, Yuki Ashida, Atsushi Teramoto, Hiroyuki Takashima, Azuma Naito, Nao Tokuda, Nao Yamauchi, Nobutoshi Ichise, Izaya Ogon, Toshihiko Yamashita, Noritsugu Tohse

Journal of orthopaedic research : official publication of the Orthopaedic Research Society    2024.01  [International journal]

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Although platelet-rich plasma (PRP) has been widely used regardless of the severity of muscle strain, there have been very few basic studies in which its effects on muscle injury were examined by using models that accurately mimic the clinical muscle strain injury process. Therefore, the aim of this study was to confirm by physiological and structural analyses whether PRP purified by a general preparation method has a muscle healing effect on muscle damage caused by eccentric contraction (ECC). Male Wistar rats were subjected to muscle injury induced by ECC in bilateral plantar flexor muscles using electrical stimulation and an automatically dorsiflexing footplate. The rats were randomly assigned to three groups by type of injection: phosphate-buffered saline (PBS), leukocyte-poor PRP (LP-PRP), or leukocyte-rich PRP (LR-PRP) injection into gastrocnemius muscles three times at weekly intervals. The platelet concentrations of the LP-PRP and LR-PRP were three to five times higher than that of whole blood. The recovery process of torque strength in the plantar flexor muscle, signal changes in MRI images, and histological evaluation 3 weeks after injury showed no obvious differences among the three groups, and every muscle recovered well from the injury without marked fibrosis. The results that neither LP-PRP nor LR-PRP was found to accelerate healing of muscle injuries suggested that conventional preparation and use of PRP for simple muscle injuries caused by muscle strain should be carefully considered, and further basic research using models that accurately mimic clinical practice should be carried out to determine the optimal use of PRP.

DOI PubMed

Minimizing the risk of injury to the popliteal artery during pullout repair of medial meniscus posterior root tears: A cadaveric study

Yuta Mori, Tomoaki Kamiya, Shinichiro Okimura, Kousuke Shiwaku, Yohei Okada, Atsushi Teramoto, Toshihiko Yamashita

Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology    2024.01

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ハイドロリリースにより筋膜間の滑走抵抗は低下する 未固定凍結遺体を用いた生体力学試験

塩泡 孝介, 大坪 英則, 鈴木 大輔, 神谷 智昭, 寺本 篤史, 小出所 大樹, 谷口 圭吾, Stecco Carla

北海道整形災害外科学会雑誌 ( 北海道整形災害外科学会 )  66 ( 143rd suppl ) 51 - 51  2024

High-intensity interval training using electrical stimulation ameliorates muscle fatigue in chronic kidney disease-related cachexia by restoring mitochondrial respiratory dysfunction.

Hiroyori Fusagawa, Tatsuya Sato, Takashi Yamada, Azuma Naito, Nao Tokuda, Nao Yamauchi, Nobutoshi Ichise, Toshifumi Ogawa, Takuro Karaushi, Atsushi Teramoto, Noritsugu Tohse

Frontiers in physiology   15   1423504 - 1423504  2024  [International journal]

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BACKGROUND: Exercise, especially high-intensity interval training (HIIT), can increase mitochondrial respiratory capacity and enhance muscular endurance, but its systemic burden makes it difficult to safely and continuously prescribe for patients with chronic kidney disease (CKD)-related cachexia who are in poor general condition. In this study, we examined whether HIIT using electrical stimulation (ES), which does not require whole-body exercise, improves muscle endurance in the skeletal muscle of 5/6 nephrectomized rats, a widely used animal model for CKD-related cachexia. METHODS: Male Wistar rats (10 weeks old) were randomly assigned to a group of sham-operated (Sham) rats and a group of 5/6 nephrectomy (Nx) rats. HIIT was performed on plantar flexor muscles in vivo with supramaximal ES every other day for 4 weeks to assess muscle endurance, myosin heavy-chain isoforms, and mitochondrial respiratory function in Nx rats. A single session was also performed to identify upstream signaling pathways altered by HIIT using ES. RESULTS: In the non-trained plantar flexor muscles from Nx rats, the muscle endurance was significantly lower than that in plantar flexor muscles from Sham rats. The proportion of myosin heavy chain IIa/x, mitochondrial content, mitochondrial respiratory capacity, and formation of mitochondrial respiratory supercomplexes in the plantaris muscle were also significantly decreased in the non-trained plantar flexor muscles from Nx rats than compared to those in plantar flexor muscles from Sham rats. Treatment with HIIT using ES for Nx rats significantly improved these molecular and functional changes to the same degrees as those in Sham rats. Furthermore, a single session of HIIT with ES significantly increased the phosphorylation levels of AMP-activated protein kinase (AMPK) and p38 mitogen-activated protein kinase (MAPK), pathways that are essential for mitochondrial activation signaling by exercise, in the plantar muscles of both Nx and Sham rats. CONCLUSION: The findings suggest that HIIT using ES ameliorates muscle fatigue in Nx rats via restoration of mitochondrial respiratory dysfunction with activation of AMPK and p38 MAPK signaling. Our ES-based HIIT protocol can be performed without placing a burden on the whole body and be a promising intervention that is implemented even in conditions of reduced general performance status such as CKD-related cachexia.

DOI PubMed

Relationships between flexion strength and dexterity of the toes and physical performance.

Kota Watanabe, Yuzo Ashida, Kento Hirota, Tatsuya Taniguchi, Hiroki Miyamoto, Atsushi Teramoto

Journal of back and musculoskeletal rehabilitation    2023.12  [International journal]

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BACKGROUND: Toe function is characterised by the strength and dexterity of toe motion. However, previous studies have mostly focused on the importance of toe strength. OBJECTIVE: This study aimed to investigate the relationships between flexion strength and dexterity of the toes and physical performance. METHODS: Twenty healthy participants were included in this study. The flexion force of each toe was measured using a digital force gauge, and the toe dexterity was evaluated using the marble pick-up and rock-paper-scissors tests. These parameters were statistically analysed in relation to physical performance, including repeated side step and balance ability, which was evaluated using centre of pressure (COP) data during single-leg standing, tiptoe standing, and single-leg drop-jumping. RESULTS: A significant correlation was found between the first toe flexion force and the total trajectory length of the COP during one-leg standing and between the time required for marble pick-up and the rock-paper-scissors score and the COP during single-leg drop-jumping. CONCLUSION: The results underscore the importance of flexion strength and dexterity of the toes in human physical performance and the necessity for the evaluation and improvement of both functions.

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Quantitative assessment of anterior talofibular ligament quality in chronic lateral ankle instability using magnetic resonance imaging T2* value.

Yoshihiro Akatsuka, Atsushi Teramoto, Yasutaka Murahashi, Katsunori Takahashi, Rui Imamura, Hiroyuki Takashima, Kota Watanabe, Toshihiko Yamashita

Skeletal radiology    2023.10  [International journal]

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OBJECTIVE: To determine T2* normal reference values for anterior talofibular ligament (ATFL) and to investigate the feasibility of the quantitative ATFL quality evaluation in chronic lateral ankle instability (CLAI) using T2* values. MATERIALS AND METHODS: This study enrolled 15 patients with CLAI and 30 healthy volunteers. The entire ATFL T2* values from the MRI T2* mapping were measured. The prediction equation (variables: age, height, and weight) in a multiple linear regression model was used to calculate the T2* normal reference value in the healthy group. T2* ratio was defined as the ratio of the actual T2* value of the patient's ATFL to the normal reference value for each patient. A Telos device was used to measure the talar tilt angle (TTA) from the stress radiograph. RESULTS: T2* values of ATFL in the healthy and CLAI groups were 10.82 ± 1.84 ms and 14.36 ± 4.30 ms, respectively, which are significantly higher in the CLAI group (P < 0.05). The prediction equation of the normal reference T2* value was [14.9 + 0.14 × age (years) - 4.7 × height (m) - 0.03 × weight (kg)] (R2 = 0.65, P < 0.0001). A significant positive correlation was found between the T2* ratio and TTA (r = 0.66, P = 0.007). CONCLUSION: MRI T2* values in patients with CLAI were higher than those in healthy participants, and the T2* ratio correlated with TTA, suggesting that T2* values are promising for quantitative assessment of ATFL quality preoperatively.

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