Journal of the Society of Biomechanisms
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Volume 42, Issue 2
Displaying 1-8 of 8 articles from this issue
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Reviews
Reports
  • Difference in the Improvement Rate of Knee Flexion Range of Motion after Total Knee Arthroplasty of the Patients with Knee Osteoarthritis and Rheumatoid Arthritis
    Yutaro SANADA, Suguru OHSAWA, Takayuki SHIIKI, Kouji IMATAKA
    2018 Volume 42 Issue 2 Pages 119-124
    Published: 2018
    Released on J-STAGE: June 09, 2018
    DOIhttps://doi.org/10.3951/sobim.42.2_119
    JOURNAL FREE ACCESS
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    To investigate difference in the improvement rate of flexion Range of Motion (ROM) one year after total knee arthroplasty (TKA) of the patients with knee osteoarthritis (knee OA) and rheumatoid arthritis (RA) under conditions where no differences in preoperative ROM. Twenty-eight knees of twenty-two patients with knee OA and seventeen knees of fifteen patients with RA were included in this longitudinal study. Based on the preoperative ROM, we classified subjects into the good ROM group (ROM; 130 degree or more) and the medium ROM group (ROM< 130 degree), and then classified into 2 groups by diagnosis. The improvement degree of knee flexion ROM one year after surgery was calculated and compared between both diseases. In the good ROM group there was no differences in postoperative improvement degree of knee flexion ROM between the knee OA and the RA, however in the medium ROM group the patients with RA were significantly larger than the patients with knee OA. These findings suggest the improvement degree of knee flexion ROM one year after TKA was similar in the both diseases when the preoperative ROM was 130 degree or more, but, that of the patients with RA was larger when the preoperative ROM was less than 130 degree.
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Short paper
  • Effectiveness of Dynamical Thoracic Spine Model using Wrapping
    Ryo HIGUCHI, Akira KOMATSU, Jumpei IIDA, Takehiro IWAMI, Yoichi SHIMAD ...
    2018 Volume 42 Issue 2 Pages 125-128
    Published: 2018
    Released on J-STAGE: June 09, 2018
    DOIhttps://doi.org/10.3951/sobim.42.2_125
    JOURNAL FREE ACCESS
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    The aim of this study was to validate the difference and effectiveness of the trunk muscle force for effect of the muscle path in the 3-dimensional trunk musculoskeletal model. The skeletal models were constructed from each thoracolumbar vertebrae, sacrum, ribs and sternum, and the muscle models were constructed short dorsal muscles, transversospinalis muscles, erector spinae muscles, abdominal muscles and psoas muscle. In order to define muscle path, we constructed 2-types muscle path models which were connecting origin point and insertion point by straight line muscle (Via-Point) using Magnetic Resonance Imaging (MRI) data (Via-Point type), and performing Wrapping (curve approximation that like along the objects) towards transversospinalis muscles and erector spinae muscles originated from Via-Point muscle (Wrapping type). Verification of constructed models compared with muscle force in 3-type orientations (static standing, flexion and left lateral bending). As a result, muscle force changed performing Wrapping in trunk muscles, and difference of muscle path demonstrated affects in vivo loading estimation.
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