Evaluation of Viscoelastic Property of Articular Cartilage Based on Mechanical Model Considering Tissue Microstructure

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概要

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• The mechanical behavior of articular cartilage is strongly dependent on its microstructure characterized by three-dimensional, depth-dependent densities and anisotropic arrangements of cartilage cells and collagen fibres in extracellular matrix. The inclusion of cartilage microstructure to model analysis is essential for the accurate evaluation of the mechanical property. This study proposes a model-based evaluation method, which could predict tissue microstructure (collagen fibres, proteoglycans, and cartilage cells) based on a time history of reaction force obtained from indentation test, thereby estimating the depth-dependent cartilage mechanical property that is difficult to be estimated by experiment in conventional methods. The model was used for evaluating the viscoelasticities of cartilage at medial (load-supporting) and lateral (non load-supporting) regions on bovine femoral head. The present simulation allows fitting the time-history of reaction force measured from indentation test (R<SUP>2</SUP> = 0.993 ± 0.0012 for lateral region and R<SUP>2</SUP> = 0.990 ± 0.0032 for medial region). The differences of the elastic modulus of collagen fibre and the permeability between medial and lateral regions were consistent to those observed from the chemical composition analysis.

• 一般社団法人 日本機械学会の論文

著者

• Naito Hisashi

  Department Of Exercise Physiology Graduate School Of Health And Sports Science Juntendo University

• Matsumoto Takeshi

  Department Of Biology Faculty Of Science Kumamoto University

• Tanaka Masao

  Department Of Biology Faculty Of Science Kyushu University

• MATSUMOTO Takeshi

  Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University

• OSAWA Takako

  Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University

• NAITO Hisashi

  Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University

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