Journal of the Society of Biomechanisms
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Volume 29, Issue 4
Displaying 1-10 of 10 articles from this issue
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  • Appropriate stress distribution on a hip prosthesis - Assessments of different kinds of stems by measurements and FEM analysis -
    Rina SAKAI, Moritoshi ITOMAN, Satoru NEBUYA, Kiyoshi MABUCHI
    2005 Volume 29 Issue 4 Pages 210-218
    Published: 2005
    Released on J-STAGE: October 23, 2007
    DOIhttps://doi.org/10.3951/sobim.29.210
    JOURNAL FREE ACCESS
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    In this study, FEM was used to analyze the stress at the interface between a prosthetic stem and femur. FE models of three contemporary stems were constructed for a computer simulation. As the results, it was found that the stress distribution on the PerFix SV (PSV) stem .uctuated with a slight disturbance. On the Intra-Medullary Cruciate (IMC) stem, the high stress areas were distributed on the proximal area and under the pin. The high stress area on the VerSys (VS) stem spread on the medial side. It was shown as the results that the stress on the stem which was designed for wide .xation area was apt to localize in the inadequate area. This .nding was veri.ed by the experiments using the loading tests on the actual stems with stress .lms and a stress sensor.
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  • Comparisons of fixation stiffness of some hip stems with specific geometries
    Rina SAKAI, Nobue KANAI, Moritoshi ITOMAN, Satoru NEBUYA, Kiyoshi MABU ...
    2005 Volume 29 Issue 4 Pages 219-226
    Published: 2005
    Released on J-STAGE: October 23, 2007
    DOIhttps://doi.org/10.3951/sobim.29.219
    JOURNAL FREE ACCESS
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    Appropriate design of stem geometry for a hip joint prosthesis is important for secure initial .xation. In this report, we introduced .xation stiffness as a criterion for the evaluation of the initial .xation. Some contemporary stems with distinctive geometries were estimated using this criterion. Finite element (FE) models were constructed for the computer simulation. The displacement of stem and femur model was calculated. The ratio of displacement to the vertical load was de.ned as .xation stiffness. As the results, the z-axis .xation stiffness estimated on the Intra-Medullary Cruciate stem, the VerSys stem, and the Per.x SV stem were evaluated as 461 MN/mm, 264 MN/mm, and 313 MN/mm, respectively. The .xation stiffness in the z direction was superior for the IMC stem than other two stems.
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  • A kinemartic model of hierarchy structure between a bulk ligament and fascicles
    Syoko Sazaki, Shunji Hirokawa
    2005 Volume 29 Issue 4 Pages 227-234
    Published: 2005
    Released on J-STAGE: October 23, 2007
    DOIhttps://doi.org/10.3951/sobim.29.227
    JOURNAL FREE ACCESS
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    The strength of an industrial composite such as a .ber-reinforced plastic falls between those of .ber and plastic matrix. While the ligament is composed of collagen fascicles in a matrix whose stiffness is almost negligible, the bulk ligament is stiffer than the fascicles that compose it; we will call this nature of ligament as inverse characteristics. To insight into the mechanism of the inverse characteristic, we developed two kinds of kinematic model of ligament composed of a bundle of fascicles by taking the ligament's hierarchy structure into account; one is a discrete type of spring model and the other is a continuous type of hyper elastic model. We incorporated a fascicle.s kinematic non-uniformity along it and mechanical interaction between fascicles due to matrix into the models. First we created the discrete model so as to duplicate three typical phases seen in a stress-strain curve of ligament, namely the toe, linear and failure phases. Then we created the continuous model under the conditions of .nite deformation and incompressibiliy, which are inherent in the ligament. Simulations were performed using the above two models, thereby obtaining the results which reproduced the above-mentioned inverse characteristics.
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