Details of a Researcher - TAJIMA Takuya

座談会ラグビーワールド･カップからみえてきたスポーツ医学の実際と課題

Predictors of Spondylolysis on Magnetic Resonance Imaging in Adolescent Athletes With Low Back Pain

Takuji Yokoe, Takuya Tajima, Hiroshi Sugimura, Shinichirou Kubo, Shotarou Nozaki, Nami Yamaguchi, Yudai Morita, Etsuo Chosa

Orthopaedic Journal of Sports Medicine 2021.4

Publishing type：Research paper (scientific journal)

Turner’s syndrome associated with discoid lateral meniscus and Blount’s disease: a case report

Kita T, Tajima T, Chosa E

BMC Musculoskeletal Disorders 2021.3

Publishing type：Research paper (scientific journal)

Effect of total hip arthroplasty on improving locomotive syndrome in hip disease patients: A prospective cohort study focused on total clinical decision limits stage 3 Reviewed

Shigeaki Miyazaki, Kurumi Tsuruta, Saori Yoshinaga, Yoichiro Yamaguchi, Yoshinori Fujii, Hideaki Arakawa, Masaru Ochiai, Tsubasa Kawaguchi, Aya Unoki, Takero Sakamoto, Takuya Tajima, Yoshihiro Nakamura, Taro Funamoto, Masaru Hiyoshi, Etsuo Chosa

Journal of Orthopaedic Science 21 2021.2

Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.jos.2020.12.028

田島卓也, 守屋拓朗, 高森草平, 井澤秀典, 大野均, 德永祥尭, 黒田良祐

臨床整形外科 56 ( 1 ) 4 - 14 2021.1

Publishing type：Research paper (scientific journal) Publisher：株式会社医学書院

DOI： 10.11477/mf.1408201881

Predictors of Spondylolysis on Magnetic Resonance Imaging in Adolescent Athletes With Low Back Pain Reviewed

Yokoe T., Tajima T., Sugimura H., Kubo S., Nozaki S., Yamaguchi N., Morita Y., Chosa E.

Orthopaedic Journal of Sports Medicine 9 ( 4 ) 2325967121995466 2021.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Orthopaedic Journal of Sports Medicine

Background: Spondylolysis and undiagnosed mechanical low back pain (UMLBP) are the main causes of low back pain (LBP) in adolescent athletes. No studies have evaluated the difference in clinical and radiographic factors between these 2 conditions. Furthermore, it remains unclear which adolescent athletes with LBP should undergo advanced imaging examination for spondylolysis. Purpose: To compare the clinical and radiographic factors of adolescent athletes with spondylolysis and UMLBP who did not have neurological symptoms or findings before magnetic resonance imaging (MRI) evaluation and to determine the predictors of spondylolysis findings on MRI. Study Design: Cohort study, Level of evidence, 3. Methods: The study population included 122 adolescent athletes aged 11 to 18 years who had LBP without neurological symptoms or findings and who underwent MRI. Of these participants, 75 were ultimately diagnosed with spondylolysis, and 47 were diagnosed with UMLBP. Clinical factors and the following radiographic parameters were compared between the 2 groups: spina bifida occulta, lumbar lordosis (LL) angle, and the ratio of the interfacet distance of L1 to that of L5 (L1:L5 ratio, %). A logistic regression analysis was performed to evaluate independent predictors of spondylolysis on MRI scans. Results: Significantly more athletes with spondylolysis were male (82.7% vs 48.9%; P <.001), had a greater LL angle (22.8° ± 8.1° vs 19.3° ± 8.5°; P =.02), and had a higher L1:L5 ratio (67.4% ± 6.3% vs 63.4% ± 6.6%; P =.001) versus athletes with UMLBP. A multivariate analysis revealed that male sex (odds ratio [OR], 4.66; P <.001) and an L1:L5 ratio of >65% (OR, 3.48; P =.003) were independent predictors of positive findings of spondylolysis on MRI scans. Conclusion: The study findings indicated that sex and the L1:L5 ratio are important indicators for whether to perform MRI as an advanced imaging examination for adolescent athletes with LBP who have no neurological symptoms and findings.

DOI： 10.1177/2325967121995466

Symptomatic discoid lateral meniscus shows a relationship between types and tear patterns, and between causes of clinical symptom onset and the age distribution Reviewed

Yamaguchi N., Chosa E., Tajima T., Morita Y., Yokoe T.

Knee Surgery, Sports Traumatology, Arthroscopy 30 ( 4 ) 1436 - 1442 2021.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Knee Surgery, Sports Traumatology, Arthroscopy

Purpose: Discoid meniscus is a congenital abnormality of the lateral meniscus and is seen more frequently in East Asia. The purpose of this study was to retrospectively assess the relationship between discoid lateral meniscus (DLM) types and tear patterns and causes of age-specific clinical symptom onset. Methods: Of 1650 arthroscopic surgeries over a 20-year period, 138 (105 patients) were performed for DLM and were evaluated in this study. The mean age at surgery was 21.5 ± 15.8 years. The DLM type was classified by Watanabe’s classification, and tear patterns were classified by the modified Bin’s classification as simple horizontal, complicated horizontal, longitudinal, radial, complex, and no tear. Additionally, patients were divided by age group (< 10, 10–19, 20–39, 40–59, and ≥ 60 years) and classified according to the causes of clinical symptom onset as follows: sports activities, minor trauma in daily living, and no traumatic episode. Results: The DLM was complete in 78 (56.5%) knees and incomplete in 60 (43.5%); no Wrisberg type DLM was observed. Simple horizontal and complicated horizontal tears were significantly more frequent in complete DLM, whereas radial tears and no tears were significantly more frequent in incomplete DLM (p < 0.0001). When classified by age group, 74 (53.6%) knees with DLMs were found in teenagers. Sports activities caused symptom onset significantly more often in teenagers, no traumatic episode caused symptom onset in patients aged < 10 years, and minor trauma in daily living caused symptom onset in patients aged 40–59 years and ≥ 60 years (p < 0.0001). No relationship was found between the age distribution and tear patterns; however, the absence of tears tended to be more common in teenaged patients, and complicated horizontal tears were more common in patients over 20 years of age. Conclusion: Symptomatic DLM occurred most often in teenagers. A relationship was identified between the DLM types and tear patterns, which could be helpful in preoperative planning. Causes of clinical symptom onset in patients with DLM were characterised by age group, which might help clinicians to suspect the presence of DLM. Level of evidence: Level IV.

DOI： 10.1007/s00167-021-06635-3

A case of nail-patella syndrome with osteochondral lesion of the lateral femoral condyle accompanied with anomalies of anterior horns of the menisci and lateral femoral condyle

Significance of Physical Activities and Sports for Children

2021

Publishing type：Research paper (scientific journal)

Yokoe T., Tajima T., Yamaguchi N., Morita Y., Chosa E.

Journal of Orthopaedic Science 2021

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Orthopaedic Science

DOI： 10.1016/j.jos.2021.09.004

The Ratio of Stress to Nonstress Anterior Talofibular Ligament Length on Ultrasonography: Normative Values

Biomechanical evaluation of artificial hip joint stem with Young's modulus gradation

2021

Publishing type：Research paper (scientific journal)

Yokoe T., Tajima T., Kawagoe S., Yamaguchi N., Morita Y., Chosa E.

Orthopaedic Journal of Sports Medicine 9 ( 11 ) 23259671211056305 2021

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Orthopaedic Journal of Sports Medicine

Background: Stress ultrasonography (US) has been shown to be a valid procedure for evaluating chronic anterior talofibular ligament (ATFL) injury. The ratio of stress/nonstress ATFL length (ATFL ratio) as measured on US is clinically useful; however, there are no published normative data concerning this ratio. Purpose: To report a normative value of the ATFL ratio on US and evaluate the relationships between sex, generalized joint laxity (GJL), and the grade of anterior drawer test (ADT). Study Design: Cross-sectional study; Level of evidence, 3. Methods: The ATFL lengths were prospectively measured in the stress and nonstress positions (manual maximal anterior drawer position) for participants with noninjured ankles from March 2020 to March 2021. GJL was defined as a Beighton score ≥4. A manual ADT was also performed. The ATFL ratio was calculated, and the relationships between sex, GJL, and ADT grade were evaluated. Results: A total of 333 ankles in 184 participants (mean age, 24.5 ± 2.7 years; range, 20-33 years) were eligible for the analysis. GJL was found in 69 ankles (20.7%). The mean ATFL ratio was 1.08 ± 0.04 (95% CI, 1.08-1.09; range, 1.01-1.24), and there was a significant difference between male (1.07 ± 0.04; 95% CI, 1.07-1.08; range, 1.02-1.23) and female (1.09 ± 0.04; 95% CI, 1.08-1.10; range, 1.01-1.24) ankles (P =.001). In male ankles, the ATFL ratio was significantly greater in participants with GJL (1.11 ± 0.06 vs 1.07 ± 0.03; P =.02) or a higher grade of ADT (grade 2 vs grade 1: 1.11 ± 0.06 vs 1.07 ± 0.03, P =.002). These findings were not observed in female ankles. Conclusion: The normative value of the ATFL ratio on stress US was 1.07 ± 0.04 in men and 1.09 ± 0.04 in women. The ATFL ratio was affected by the presence of GJL in men but not in women. These findings will be useful for future studies seeking to establish the cutoff value of the ATFL ratio for diagnosing chronic lateral ankle stability on stress US.

DOI： 10.1177/23259671211056305

特集アキレス腱断裂診療のコツと最近のトピックスアキレス腱断裂の診断

Efficacy of Diagnosing Carpal Tunnel Syndrome Using the Median Nerve Stenosis Rate Measured on Ultrasonographic Sagittal Imagery: Clinical Case-Control Study

Okura T., Sekimoto T., Matsuoka T., Fukuda H., Hamada H., Tajima T., Chosa E.

Hand 2021

Publishing type：Research paper (scientific journal)

田島卓也, 帖佐悦男

整形･災害外科 63 ( 12 ) 1627 - 1635 2020.11

Publishing type：Research paper (scientific journal) Publisher：金原出版

DOI： 10.18888/se.0000001518

Analysis of Suitable Cervical Spine Alignment and Muscle Strength Around The Neck of Collision Sports Players – To Prevent The Severe Head and Neck Injuries Reviewed

Tajima Takuya, Yamaguchi Nami, Kuroki Syuji, Morita Yudai, Chosa Etsuo

DESCENTE SPORTS SCIENCE 41 ( 0 ) 135 - 144 2020.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION OF SPORTS SCIENCE

Severe head and neck injuries occasionally occur in collision sports such as Judo or Rugby football. Degenerative changes in the cervical spine including abnormal alignment, spur formation and disc space narrowing are risk factors for severe injuries. It is also well known that neck muscle strength is one of the important factors for the prevention of severe injuries and degenerative disorders. The aim of this study future was to assess the relationship between the neck muscle strength and radiographic findings of the cervical spine among collision sports players. We hypothesized that poor muscle strength and unbalanced neck muscle flexion/extension strength ratio maybe associated with degenerative cervical findings. 168 judo-players （22-32 years old） and 203 rugby football-players （18-30） underwent neck extension and flexion muscle strength measurement, and 55 judo-players and 58 rugby players underwent cervical radiographical examination. Cervical alignment was classified as normal, straight, kyphosis, and sigmoid according to the Borden & Rechitman method. Disc space narrowing and spur formation were also measured according to the Kondo method and the Nathan classification. Height, weight, neck flexion and extension strength, flexion/extension ratio of the judo group ware higher than that of the rugby group with stastical significance. However, there were no significant difference of result/weight value （Judo: flexion;2.39N, extension;3.38N. ratio;0.71, Rugby: flexion;2.37, extension; 3.41, ratio; 0.70）．In Judo group, sigmoid deformity group （420±50.2N） showed significantly higher neck extension strength compared with normal group （331.7±48.4N, p<0.05）．At the factor of flexion/extension muscle strength ratio, straight （0.67） and kyphosis （0.63） group showed significantly lower value compared with normal group （0.78. p<0.05） in Judo. In Rugby group, the presence of spur formation group （0.54） showed lesser flexion/extension muscle strength ratio compared with normal group （0.68）， significantly （p<0.05）．Neck muscle strength is one important factor to prevent and reduce the severe neck injury or cervical spine abnormal findings. From this study, not only the value of muscle strength, but also the flexion/extension ratio provide important contribution for these findings. Lower flexion/extension neck muscle strength ratio is one of the risk factors of cervical spine issues for collision sports players.

DOI： 10.57488/descente.41.0_135

Googling Musculoskeletal-Related Pain and Ranking of Medical Associations’ Patient Information Pages: Google Ads Keyword Planner Analysis Reviewed

山口洋一朗, 李徳哲, 永井琢哉, 舩元太郎, 田島卓也, 帖佐悦男

Journal of Medical Internet Research 22 ( 8 ) e18684 2020.8

Authorship：Lead author,　Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：JMIR Publications

ackground:
Most people currently use the internet to obtain information about many subjects, including health information. Thus, medical associations need to provide accurate medical information websites. Although medical associations have their own patient education pages, it is not clear if these websites actually show up in search results.

Objective:
The aim of this study was to evaluate how well medical associations function as online information providers by searching for information about musculoskeletal-related pain online and determining the ranking of the websites of medical associations.

Methods:
We conducted a Google search for frequently searched keywords. Keywords were extracted using Google Ads Keyword Planner associated with “pain” relevant to the musculoskeletal system from June 2016 to December 2019. The top 20 search queries were extracted and searched using the Google search engine in Japan and the United States.

Results:
The number of suggested queries for “pain” provided by Google Ads Keyword Planner was 930 in the United States and 2400 in Japan. Among the top 20 musculoskeletal-related pain queries chosen, the probability that the medical associations’ websites would appear in the top 10 results was 30% in the United States and 45% in Japan. In five queries each, the associations’ websites did not appear among the top 100 results. No significant difference was found in the rank of the associations’ website search results (P=.28).

Conclusions:
To provide accurate medical information to patients, it is essential to undertake effective measures for search engine optimization. For orthopedic associations, it is necessary that their websites should appear among the top search results.