Papers - TAJIMA Takuya
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Imazato H, Takahashi N, Hirakawa Y, Yamaguchi Y, Hiyoshi M, Tajima T, Chosa E, Sawaguchi A
Scientific reports 13 ( 1 ) 6352 2023.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Scientific Reports
Recent physiological studies have shown that the deep fascia has received much attention concerning clinical medicine; however, histological examination of the deep fascia has not been well established. In this study, we aimed to clarify and visualize the structure of the deep fascia by taking advantage of cryofixation techniques and low-vacuum scanning electron microscopy. As a result, the ultrastructural observations revealed three-dimensional stratification of the deep fascia composed of three layers: the first superficial layer consisting of collagen fibers extending in various directions with blood vessels and peripheral nerves; the second intermediate layer formed by single straight and thick collagen fibers with flexibility; and the third deepest layer, consisting of relatively straight and thin collagen fibers. We explored the use of two hooks to hold a piece of deep fascia in place through the course of cryo-fixation. A comparative observation with or without the hook-holding procedure would indicate the morphological adaptation to physiological stretch and contraction of the deep fascia. The present morphological approach paves the way to visualize three-dimensional ultrastructures for future biomedical studies including clinical pathophysiology.
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Three‑dimensional fine structures in deep fascia revealed by combined use of cryo‑fixed histochemistry and low‑vacuum scanning microscopy Reviewed
Hiroyuki Imazato,NobuyasuTakahashi,Yusuke Hirakawa, Yoichiro Yamaguchi,Masaru Hiyoshi,Takuya Tajima, Etsuo Chosa, Akira Sawaguchi
Scientific reports 13 ( 1 ) 6352 2023.4
Language：English Publishing type：Research paper (bulletin of university, research institution) Publisher：Springer
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Yamako G, Punchihewa NG, Arakawa H, Tajima T, Chosa E
Sensors (Basel, Switzerland) 23 ( 7 ) 2023.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Sensors
Standing up from a chair is a mechanically demanding daily motion, and its biomechanics represent motor performance. In older adults with locomotive syndrome (LS), sit-to-stand (STS) movement with adequate postural control is essential to prevent falls. This study evaluated the characteristics of dynamic balance during STS movement on older adults with LS. A total of 116 participants aged ≥65 years were divided into Non-LS, LS stage 1, and LS stage 2 groups using the LS risk test. The participants were instructed to stand on the Nintendo Wii Balance Board as quickly as possible, and the STS movement was quantified using the vertical ground reaction force (VGRF) and center of pressure (CoP). The STS score, which represented dynamic balance, was significantly different among the groups (p < 0.001). The rate of VGRF development was significantly lower in the LS stages 1 and 2 than in the Non-LS group (p < 0.001). On the other hand, the total distance of the CoP path did not differ among the groups (p = 0.211). These findings indicated a reduction of postural control in older adults with LS. The STS score emphasized the importance of balance training to prevent falls in older adults with LS.
DOI： 10.3390/s23073368
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Risk factors of failure results after double-bundle reconstruction with autogenous hamstring grafts for isolated posterior cruciate ligament rupture cases Reviewed
Yudai Morita,Takuya Tajima,Nami Yamaguchi,Takuji Yokoe,Makoto Nagasawa,Tomomi Ota,Kouki Ouchi,Etsuo Chosa
Scientific reports 6192 2023.3
Language：English Publishing type：Research paper (bulletin of university, research institution)
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Risk factors of failure results after double-bundle reconstruction with autogenous hamstring grafts for isolated posterior cruciate ligament rupture cases Reviewed
Yudai Morita,Takuya Tajima,Nami Yamaguchi,Takuji Yokoe,Makoto Nagasawa,Tomomi Ota,Kouki Ouchi,Etsuo Chosa
Scientific reports 6192 2023.3
Language：English Publishing type：Research paper (bulletin of university, research institution) Publisher：nature portfolio
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Yokoe T, Ouchi K, Matsumoto T, Tajima T, Chosa E
The Knee 42 57 - 63 2023.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Knee
Background: Partial meniscectomy is commonly performed for symptomatic patients with discoid lateral meniscus (DLM) if conservative treatment fails. However, the development of knee osteoarthritis and osteochondral lesion are detrimental postoperative complications. This study aimed to evaluate the effect of the volume of resected DLM on the contact stress of the tibiofemoral joint using a finite element analysis. Methods: Subject-specific finite-element models of the knee joint of a patient with DLM were developed from computed tomographic and magnetic resonance images. To evaluate the effect of partial meniscectomy on the contact stress in the lateral tibiofemoral joint, six knee models were created in the study (the native DLM, and five partially meniscectomized DLMs (according to the preserved width of the meniscus: 12 mm, 10 mm, 8 mm, 6 mm, and 4 mm)). Results: As the volume of resected DLM increased, higher contact stress was applied to the lateral tibiofemoral joint. Greater contact stress was applied to the preserved lateral meniscus than to the native DLM. Conclusions: From a biomechanical viewpoint, the native DLM was the most protective against lateral tibiofemoral contact stress in comparison to partially meniscectomized DLMs.
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Effect of the volume of resected discoid lateral meniscus on the contact stress of the tibiofemoral joint: A finite element analysis Reviewed
Takuji Yokoe, Koki Ouchi, Taisei Matsumoto, Takuya Tajima, Etsuo Chosa
The Knee 57 - 63 2023.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier
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Insertion sites of the muscles attached to the clavicle: a cadaveric study of the clavicle.
Imazato H, Takahashi N, Sawaguchi A, Hirakawa Y, Yamaguchi Y, Hiyoshi M, Tajima T, Chosa E
BMC musculoskeletal disorders 24 ( 1 ) 160 2023.3
Language：English Publishing type：Research paper (scientific journal) Publisher：BMC Musculoskeletal Disorders
Background: Clavicle fractures are common injuries, especially in young, active individuals. Operative treatment is recommended for completely displaced clavicle shaft fractures, and plate fixation is stronger than the use of intramedullary nails. Few studies have reported on iatrogenic injuries to the muscle attached to the clavicle during fracture surgery. The aim of this study was to clarify the area of the insertion sites of muscles attached to the clavicle in Japanese cadavers using gross anatomy and three-dimensional (3D) analysis. We also aimed to compare the effects of anterior plate templating and superior plate templating on clavicle shaft fractures using 3D images. Methods: Thirty-eight clavicles from Japanese cadavers were analyzed. We removed all clavicles to identify the insertion sites and measured the size of the insertion area of each muscle. Three-dimensional templating was performed on both the superior and anterior plates of the clavicle using data obtained from computed tomography. The areas covered by these plates on the muscles attached to the clavicle were compared. Histological examination was performed on four randomly selected specimens. Results: The sternocleidomastoid muscle was attached proximally and superiorly; the trapezius muscle was attached posteriorly and partly superiorly; and the pectoralis major muscle and deltoid muscles were attached anteriorly and partially superiorly. The non-attachment area was located mainly in the posterosuperior part of the clavicle. It was difficult to distinguish the borders of the periosteum and pectoralis major muscles. The anterior plate covered a significantly broader area (mean 6.94 ± 1.36 cm2) of the muscles attached to the clavicle than did the superior plate (mean 4.11 ± 1.52 cm2) (p < 0.0001). On microscopy, these muscles were inserted directly into the periosteum. Conclusion: Most of the pectoralis major and deltoid muscles were attached anteriorly. The non-attachment area was located mainly from the superior to posterior part of the clavicle midshaft. Both macroscopically and microscopically, the boundaries between the periosteum and these muscles were difficult to demarcate. The anterior plate covered a significantly broader area of the muscles attached to the clavicle than that by the superior plate.
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Insertion sites of the muscles attached to the clavicle: a cadaveric study of the clavicle Reviewed
Hiroyuki Imazato, Nobuyasu Takahashi, Akira Sawaguchi, Yusuke Hirakawa, Yoichiro Yamaguchi, Masaru Hiyoshi, Takuya Tajima & Etsuo Chosa
BMC Musculoskeletal Disorders 2023.3
Language：English Publishing type：Research paper (scientific journal) Publisher：BMC
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Yokoe T, Tajima T, Yamaguchi N, Morita Y, Chosa E
Medicina (Kaunas, Lithuania) 59 ( 3 ) 2023.2
Language：English Publishing type：Research paper (scientific journal) Publisher：Medicina (Lithuania)
Muscle herniation of the lower extremity, such as tibialis anterior muscle herniation (TAMH), is not a rare cause of leg pain in athletes. However, a few studies have reported surgical treatment for TAMH, and the optimal surgical procedure remains controversial. Fasciotomy was reported to be effective for patients with TAMH. However, this procedure would be associated with a risk of intraoperative injury to the superficial peroneal nerve (SPN), although no previous literature has reported this complication. This case report aimed to report a case of bilateral TAMHs in which a traumatic neuroma of the SPN developed after fasciotomy. A 16-year-old baseball player presented with painful swelling lesions of the bilateral lower extremities (1 lesion on the right, 3 lesions on the left) after sports activities. An ultrasonographic evaluation showed swelling lesions of the anterolateral parts of the bilateral lower extremities in the standing position after dashing, while these lesions were not detected in the supine position. A fasciotomy of the crural fascia was performed after conservative treatment failed. Several days after surgery, the patient presented with weakened touch sensation over the dorsal area of the left foot. At the three-month follow-up examination, a swelling lesion with hard elasticity was identified. The palpation of this lesion caused a radiating sensation in the area supplied by the SPN. He was able to return to playing baseball six months after surgery. The patient was asymptomatic without palpation of the traumatic neuroma of the SPN at the latest follow-up examination. In conclusion, the present case report suggests that orthopedic surgeons need to consider the risk of iatrogenic injury to the SPN during fasciotomy for the treatment of TAMHs. However, there may be a risk of injuring the SPN because of the many variants of the course of the SPN within the compartment of the lower extremities.
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A Traumatic Neuroma Formation Following Fasciotomy for the Treatment of Tibialis Anterior Muscle Herniation:A Case Report Reviewed
Takuji Yokoe,Takuya Tajima,Nami Yamaguchi,Yudai Morita and Etsuo Chosa
medicina 2023.2
Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI
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Influence of the Tibial Tunnel Angle and Posterior Tibial Slope on "Killer Turn" during Posterior Cruciate Ligament Reconstruction: A Three-Dimensional Finite Element Analysis.
Yang F, Yokoe T, Ouchi K, Tajima T, Chosa E
Journal of clinical medicine 12 ( 3 ) 2023.1
Language：English Publishing type：Research paper (scientific journal)
DOI： 10.3390/jcm12030805
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Influence of the Tibial Tunnel Angle and Posterior Tibial Slope on "Killer Turn" during Posterior Cruciate Ligament Reconstruction: A Three-Dimensional Finite Element Analysis Reviewed
Fan Yang, Takuji Yokoe, Koki Ouchi, Takuya Tajima, Etsuo Chosa
Journal of Clinical Medicine 12 ( 3 ) 805 2023.1
Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI
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Okura T., Sekimoto T., Matsuoka T., Fukuda H., Hamada H., Tajima T., Chosa E.
Hand 18 ( 1_suppl ) 133S - 138S 2023.1
Language：English Publishing type：Research paper (scientific journal) Publisher：Hand
Background: The purpose of the present study was to evaluate the usefulness of the median nerve stenosis rate (MNSR) measured on sagittal sonographic images of the median nerve in the diagnosis of carpal tunnel syndrome (CTS). Methods: The study population consisted of 45 hands from 37 patients with idiopathic CTS (CTS group), and 60 hands from 35 asymptomatic healthy subjects (control group). Carpal tunnel syndrome was diagnosed by clinical findings and positive electrophysiological study results. All patients and control subjects underwent ultrasonographic examination. At the carpal tunnel level, the transducer was placed longitudinally to the median nerve, and an image of the longitudinal median nerve was obtained. The minimum median nerve diameter (MND) was measured at the middle part of the capitate level, while the maximum MND was measured at the distal radioulnar joint level. The MNSR was calculated as (1 – minimum MND/maximum MND) × 100 (%). The cross-sectional area of the median nerve was also measured at the level of the pisiform. Results: On longitudinal sonographic images, the MNSR was significantly larger in the CTS group than the control group. When the cut-off value of the MNSR was 26.73%, the sensitivity and specificity were 91.1% and 80%, respectively. The area under the receiver operating characteristic curve was larger for the MNSR than for the cross-sectional area. Conclusion: The results suggest that the MNSR proposed in the present study may be useful as an auxiliary method for CTS diagnosis on ultrasonographic examination.
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Efficacy of Diagnosing Carpal Tunnel Syndrome Using the Median Nerve Stenosis Rate Measured on Ultrasonographic Sagittal Imagery: Clinical Case-Control Study. Reviewed
Toshiyuki Okura, Tomohisa Sekimoto, Tomomi Matsuoka, Hajime Fukuda, Hiroaki Hamada, Takuya Tajima, Etsuo Chosa.
Hand (NY) 18 ( 1_suppl ) 133S - 138S 2023.1
Language：English Publishing type：Research paper (scientific journal) Publisher：SAGE Publishing
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Nakatake J., Arakawa H., Tajima T., Miyazaki S., Chosa E.
PeerJ 11 e16571 2023
Language：English Publishing type：Research paper (scientific journal) Publisher：PeerJ
Background: The objective kinematic assessments of activities of daily living are desired. However, the limited knowledge regarding age- and sex-related differences prevents the adaptation of these measurements to clinical settings and in-home exercises. Therefore, this study aimed to determine the effects of age and sex on joint and endpoint kinematics during a common activity of daily living, specifically, drinking from a glass. Methods: In total, 32 healthy adults (18 males and 14 females) aged 22–77 years performed a drinking task comprising reaching for a glass, bringing it forward and sipping, returning it, and placing the hand back to the starting position, which was recorded using a three-dimensional motion-capturing system. A two-way analysis of variance was used to statistically compare joint angles at five different time points and endpoint kinematic variables in the four drinking phases between older and younger age groups and sexes. Results: Wrist radial deviation was greater in older adults than in younger participants at all five different time points (F = 5.16–7.34, p ≤ 0.03, η2 = 0.14–0.21). Moreover, lesser shoulder abduction and greater shoulder internal rotation and forearm pronation when moving and returning the hand to the starting position were observed in the female group than in the male group (F = 4.21–20.03, p ≤ 0.0497, η2 = 0.13–0.41). Trunk flexion was lower in the female group than in the male group at all time points (F = 4.25–7.13, p ≤ 0.0485, η2 = 0.12–0.19). Regarding endpoint kinematics, the performance time in the reaching phase was longer in older adults than in younger individuals (F = 4.96, p = 0.03, η2 = 0.14). Furthermore, a shorter time while returning the hand to the starting position was observed in the female group than in the male group (F = 9.55, p < 0.01, η2 = 0.22). Conclusions: The joint kinematics of drinking were partially characterized by an age effect, whereas endpoint kinematics were scattered in all drinking phases. Sex-related effects in most upper-body motions and postures may cause rapid motions in females. Therefore, clinicians could use this knowledge for precise assessments and to suggest feasible in-home exercises.
DOI： 10.7717/peerj.16571
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Risk factors associated with throwing injuries in young baseball players
Nagasawa M., Tajima T., Kawagoe S., Yamaguchi N., Morita Y., Yokoe T., Ota T., Izumi T., Ishida Y., Chosa E.
Journal of Shoulder and Elbow Surgery 32 ( 8 ) 1673 - 1680 2023
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Shoulder and Elbow Surgery
Background: Few studies have retrospectively analyzed the relationship between joint range of motion (ROM) and muscle flexibility and shoulder and elbow throwing injuries in a large number of elementary school baseball players. The purpose of this study was to retrospectively identify the physical factors related to shoulder and elbow throwing injuries in younger baseball players. Methods: A total of 2466 younger baseball players belonging to our Prefecture Rubber Baseball Federation who participated in medical check-ups from 2016 to 2019 were analyzed. Players completed a questionnaire and had a medical check-up that included a physical examination and ultrasonography. ROM (internal rotation [IR] angle and external rotation angle) of the shoulder and hip and the finger-to-floor distance and heel-to-buttock distance were measured. The straight leg raise was also performed. The results of two groups (normal group and injury group) were compared using the χ2 test, Mann-Whitney U test, and Student t test. Stepwise forward logistic regression models were developed to identify risk factors. Results: On univariate analysis, nine of the 13 evaluated items showed significant decreases in ROM and muscle flexibility in the injury group. On multiple logistic regression analysis, grade, finger-to-floor distance, IR angle of the dominant side shoulder, and IR angle of the nondominant side hip were significantly associated with the occurrence of throwing injuries. Decreased total shoulder angle was observed not only on the dominant side but also on the nondominant side in the injury group. Conclusion: Decreased ROM and muscle flexibility were risk factors for baseball-related throwing injuries in elementary school baseball players. To prevent shoulder and elbow throwing injuries, players, coaches, medical staff, and parents need to be aware of these findings.
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Medical Support for Rugby Sevens in Tokyo2020+1 Olympic Games Reviewed
Tajima Takuya, Chosa Etsuo, Nakamura Akihiko
Japanese Journal of Orthopaedic Sports Medicine 43 ( 3 ) 105 - 110 2023
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Orthopaedic Socety for Sports Medicine
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Nishio M., Nonaka N., Fujihira R., Murakami H., Tajima T., Yamada M., Maeda A., Seita J.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 13859 LNAI 215 - 228 2023
Publishing type：Research paper (scientific journal) Publisher：Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
To provide suitable care for concussion, objective and timely detection of high-risk event is crucial. Currently it depends on monitoring by medical doctors, and there is a certain risk of missing high-risk events. A few attempts introducing video analysis have been reported, but those approaches require labeling by experts, which is skill-dependent, and time and cost consuming. To achieve objective detection of high-risk tackle without human intervention, we developed a method combining pose estimation by deep learning and pose evaluation by machine learning. From match videos of Japan Rugby Top League in 2016–2018 seasons, 238 low-risk tackles and 155 high-risk tackles were extracted. Poses of tackler and ball carrier were estimated by deep learning, then were evaluated by machine learning. The proposed method resulted AUC 0.85, and outperformed the previously reported rule-based method. Also, the features extracted by the machine learning model, such as upright positions of tackler/ball carrier, tackler’s arm dropped in extended position, were consistent with the known risk factors of concussion. This result indicates that our approach combining deep learning and machine learning opens the way for objective and timely detection of high-risk events in rugby and other contact sports.
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Ureter position and risk of ureteral injury during lateral lumbar interbody fusion
Hamanaka H., Tajima T., Kurogi S., Higa K., Nagai T., Kuroki T., Takamori H., Mukai S., Kamoto T., Chosa E.
Journal of Orthopaedic Science 2023
Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Orthopaedic Science
Background: Ureteral injury during lateral lumbar interbody fusion (LLIF) is uncommon. However, it is a serious complication that may require additional surgery should it occur. The objective of this study was to evaluate whether there was any change in the position of the left ureter between preoperative biphasic contrast-enhanced CT scanned in the supine position and intraoperative scanning in the right lateral decubitus position after stent placement, to assess the risk of ureteral injury in the actual surgical position. Methods: The position of the left ureter scanned with the O-arm navigation system with the patient in the right lateral decubitus position and its position on preoperative biphasic contrast-enhanced CT images scanned with the patient in the supine position were investigated comparing their positions at the L2/3, L3/4, and L4/5 levels. Results: The ureter was located along the interbody cage insertion trajectory in 25 of 44 disc levels (56.8%) in the supine position, but in only 4 (9.5%) in the lateral decubitus position. The proportion of patients in whom the left ureter was located lateral to the vertebral body (along the LLIF cage insertion trajectory) at each level was 80% in the supine position and 15.4% in the lateral decubitus position at the L2/3 level, 53.3% in the supine position and 6.7% in the lateral decubitus position at the L3/4 level, and 33.3% in the supine position and 6.7% in the lateral decubitus position at the L4/5 level. Conclusion: The proportion of patients in whom the left ureter was located on the lateral surface of the vertebral body when the patient was in the actual surgical position (lateral decubitus position) was 15.4% at the L2/3 level, 6.7% at the L3/4 level, and 6.7% at the L4/5 level, suggesting that caution is required during LLIF surgery.