Sato, Kazuki

写真a

Affiliation

School of Medicine, Institute for Integrated Sports Medicine （Shinanomachi）

Position

Professor

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Papers 【 Display / hide 】

  • Effect of volar angulation of extra-articular distal radius fractures on distal radioulnar joint stability

    Bessho Y., Nakamura T., Nagura T., Nishiwaki M., Sato K., Toyama Y.

    Journal of Hand Surgery: European Volume 40 （ 8 ） 775 - 782 2015.10

    ISSN  1753-1934

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    <p>The relationship between increased volar tilt of the distal radius and distal radioulnar joint stability was examined. Distal radioulnar joint stiffness was recorded at 10° intervals from 10° dorsal angulation to 20° of volar angulation from the anatomical position of the radius. Tests were performed with the intact radioulnar ligament and repeated after partial and then complete sectioning of the radioulnar ligament at the ulnar fovea. With the intact radioulnar ligament, distal radioulnar joint stiffness increased significantly at 10° and 20° of volar angulation. Partial sectioning of the radioulnar ligament resulted in an approximate 10% decrease of distal radioulnar joint stiffness compared with the intact state, but distal radioulnar joint stiffness still increased significantly with greater volar tilt. Complete sectioning of the radioulnar ligament significantly decreased distal radioulnar joint stiffness, and increasing the volar tilt did not result in increased distal radioulnar joint stiffness. These results suggest that volar angulation deformities of the distal radius should be corrected to 10° of volar tilt when the triangular fibrocartilage complex is intact.</p>

  • Shoulder position increases ulnar nerve strain at the elbow of patients with cubital tunnel syndrome

    Ochi Kensuke, Horiuchi Yukio, Horiuchi Koichi, Iwamoto Takuji, Morisawa Yasushi, Sato Kazuki

    Journal of Shoulder and Elbow Surgery 24 （ 9 ） 1380 - 1385 2015.09

    ISSN  1058-2746

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    <p>Background: Previous studies have shown that the shoulder internal rotation elbow flexion (SIREF) test, which is a modified elbow flexion (EF) test, has significantly higher sensitivity than the EF test in patients with cubital tunnel syndrome (CubTS). Here, we hypothesized that this increase in sensitivity was due to increase in the ulnar nerve strain around the elbow introduced by the additional shoulder position. Methods: Ulnar nerve strain at the elbow was intraoperatively measured at both the EF test and SIREF test positions in 20 patients with CubTS before simple decompression. Statistical analysis was performed with the Wilcoxon signed rank test at a confidence level of 99% (. P &lt; .001). Results: Mean ulnar nerve strain in the EF test position was 18.9% ± 12.1%, whereas that in the SIREF test position was 24.7% ± 14.0%. Ulnar nerve strain was higher in the SIREF than in the EF test position in all cases, and the difference was significant (mean, 5.8% ± 0.9%; 95% confidence interval, 3.90%-7.73%). Conclusion: This study indicated that increased sensitivity in the SIREF test compared with the EF test was due to the increase in ulnar nerve strain around the elbow. To the best of our knowledge, this is the first study showing that shoulder position changes the ulnar nerve strain around the elbow in living patients with CubTS.</p>

  • Comparison of surgical treatments for triple extensor tendon ruptures in rheumatoid hands

    Suzuki Taku, Iwamoto Takuji, Ikegami Hiroyasu, Sakuma Y., Ikari Katsunori, Matsumura Noboru, Ochi Kensuke, Sato Kazuki, Nakamura Masaya, Matsumoto Morio, Momohara Shigeki

    Modern Rheumatology  2015.08

    ISSN  1439-7595

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    <p>Objective. This retrospective study was designed to evaluate the outcomes of four different surgical reconstructions for extensor tendon ruptures in ulnar three fingers in 48 patients with rheumatoid arthritis. Methods. The following four techniques were performed; palmaris longus tendon grafting (PL group; n = 9), extensor indicis proprius (EIP) tendon transfers (EIP group; n = 8), end-to-side transfers with tension-reduced early mobilization (End-to-side group; n = 16), and a combination of end-to-side and EIP transfers (Combination group; n = 15). Loss of extension was evaluated to determine the mean postoperative range of motion of the metacarpophalangeal (MP) joint and clinical outcomes were categorized using modified Geldmacher criteria. Results. Combination group demonstrated the best mean MP joint extension (− 3°), followed by End-to-side group (− 12°), EIP group (− 16°), and PL group (− 21°). Combination group yielded the best clinical outcomes with all cases showing good results. Conclusions. The combination of end-to-side and EIP transfer was an effective surgical reconstruction procedure for triple fingers extension loss.</p>

  • Radial deviation of the finger caused by an occult intramuscular ganglion in a patient with rheumatoid arthritis

    Kato Tomoyuki, Iwamoto Takuji, Matsumura Noboru, Sato Kazuki, Nakamura Toshiyasu, Toyama Yoshiaki

    Modern Rheumatology  2015.06

    ISSN  1439-7595

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    <p>Ulnar deviation is a common complication in patients with rheumatoid arthritis (RA). We report a case of an unusual radial deviation of the middle finger caused by an occult intramuscular ganglion of the second interosseous muscle (IOM) in a patient with RA. The resection of the ganglion did not resolve the problem, and the full range of motion of the metacarpophalangeal (MP) joint was achieved through dissection of the tendon of the second dorsal IOM.</p>

  • Time course of osteonecrosis in rabbit articular intercalated bone

    Obara Yukihiko, Nakamura Toshiyasu, Shinmoto Hiroshi, Osada Natsuya, Yamabe Eiko, Sato Kazuki, Toyama Yoshiaki

    Magnetic Resonance in Medical Sciences 14 （ 1 ） 57 - 64 2014.12

    ISSN  1347-3182

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    <p>Purpose: Magnetic resonance (MR) imaging offers the highest sensitivity for detecting bone necrosis. We evaluated osteonecrosis in rabbit models by calculating the percentage of fat to (fat + water) [F/(F+W)] on MR spectroscopy (MRS) and compared MR spectroscopy and imaging findings with corresponding histological results. Methods: To model the natural course of articular osteonecrosis, we removed the fourth tarsal bone in 45 rabbits, froze it for 5 min in liquid nitrogen to produce complete cellular necrosis, and then replaced the bone into the knee joint. We performed Carr-Purcell- Meiboom-Gill proton spectroscopic imaging to assess necrotic bone at 3 days and one, 2, 3, 4, 8, 12, 16, and 20 weeks after osteonecrosis and calculated the percentage of F/ (F+W) of each bone. We also performed conventional T1- and T2-weighted imaging and compared all data to histological findings to analyze the natural course of necrosis. Results: T1-weighted MR imaging demonstrated obvious low signal intensity at 2 to 8 weeks and recovery at 12 to 20 weeks, whereas T2-weighted imaging demonstrated inconsistent intensities throughout the period. The postoperative percentage of F/(F+W) measured using line scan MRS decreased to 8.88% at 3 weeks, 6.22% at 8 weeks, and 34.40% at 20 weeks results that were mostly consistent with MR imaging findings. Histological findings demonstrated complete absence of osteocyte nuclei and loss of osteoid-osteogenesis at 3 to 8 weeks. Recovery of bone marrow was identified as an increase in the area of fat after 12 weeks. Conclusion: Osteonecrosis delineated by T1-weighted MR imaging demonstrated fat content in the bone marrow that correlated with histology. The present MRS modality can be used to calculate the percentage of F/(F+W) of osteonecrosis to enable objective assessment of recovery and quantification of osteonecrosis to provide a numerical value for osteonecrosis.</p>

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Presentations 【 Display / hide 】

  • 上腕骨小頭離断性骨軟骨炎遊離期症例に対する肋骨肋軟骨移植術の治療経験

    SATOU KAZUKI

    第16回日本肘関節学会 (京都) , 

    2004.02
    , 

    Oral presentation (general)

  • 関節軟骨再生に関する実験的研究 &#8211; BMP-7遺伝子導入によるTissue Engineering

    SATOU KAZUKI

    第22回日本運動器移植・再生医学研究会 (大阪) , 

    2003.10
    , 

    Oral presentation (general)

  • 肋骨肋軟骨移植に関する実験的研究

    SATOU KAZUKI

    第18回日本整形外科学会基礎学術集会 (北九州) , 

    2003.10
    , 

    Poster presentation

  • 関節軟骨再生に関する実験的研究 &#8211; BMP-7遺伝子導入によるTissue Engineering.

    SATOU KAZUKI

    第18回日本整形外科学会基礎学術集会 (北九州) , 

    2003.10
    , 

    Oral presentation (general)

  • Costal Osteochondral Graft for Joint Repair &#8211; A Biomechanical Study

    SATOU KAZUKI

    58th Annual Meeting of the American Society for Surgery of the Hand (Chicago, USA) , 

    2003.09
    , 

    Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 腱付着部炎に対する作製血小板の有効性に関する研究

    2021.04
    -
    2024.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

  • Peripheral nerve regeneration using purified stem cells of neural crest-like cells derived from human induced pluripotent stem cells

    2018.04
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

  • Experimental study on the influence of nicotine to bone metabolism

    2015.04
    -
    2018.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

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Courses Taught 【 Display / hide 】

  • SPORTS MEDICINE: SEMINAR

    2022

  • SPORTS MEDICINE: PRACTICE

    2022

  • LECTURE SERIES, ORTHOPAEDICS

    2022

  • INTRODUCTION TO CLINICAL PRACTICE

    2022

  • ADVANCED STUDIES IN HEALTH MANAGEMENT 2

    2022

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