Finite Element Analysis of Articular Cartilage Model Considering the Configuration and Biphasic Property of the Tissue

N. Hosoda, N. Sakai, Y. Sawae, T. Murakami

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    5 Citations (Scopus)

    Abstract

    Articular cartilage tissue has high water content from 70 to 80% and shows biphasic behavior in which both solid and fluid properties should be considered. Furthermore, the mechanical behavior of cartilage shows depth-dependence. Therefore it is necessary to consider not only the average tissue property but also the local one to explain mechanical and functional behavior. Previously, we created cartilage tissue model considering the depth-dependence of Young's modulus distribution and applied two-dimensional finite element method (FEM) based on biphasic theory[1]. As a result, the deformed profile of depth-dependent Young's modulus model immediately after unconfined compression corresponded to actual profile. Consequently, we confirmed that Young's modulus has a distribution in the depth direction. In contrast, the total load capacity in FEM analysis was about one order lower than the experimental one. Immediately after compression at high rate, it has not enough time for intrinsic fluid to flow in cartilage, and thus whole tissue including intrinsic fluid shows the behavior like elastic body. Furthermore, the polymeric materials increase their stiffness at higher strain rate. Therefore, apparent elastic modulus is assumed to be larger than the equilibrium Young's modulus. During total deflection is maintained after compression, the intrinsic fluid flow gradually occurs, and the stress relaxes with decrease of apparent elastic modulus. After enough stress relaxation, an apparent elastic modulus becomes an equilibrium Young's modulus. We think this is connected to configuration of the cartilage tissue. The aim of this study is to consider configuration of the tissue in addition to the character of biphasic property on the mechanical behavior of cartilage tissue. In this study, we created cartilage tissue model considering spring elements that express function arisen from collagen fiber and Young's modulus distribution depending on the depth. Then, we analyzed the unconfined compression and compared experimental results to FEM analysis.

    Original languageEnglish
    Title of host publication13th International Conference on Biomedical Engineering - ICBME 2008
    Pages1883-1887
    Number of pages5
    DOIs
    Publication statusPublished - Dec 1 2009
    Event13th International Conference on Biomedical Engineering, ICBME 2008 - , Singapore
    Duration: Dec 3 2008Dec 6 2008

    Publication series

    NameIFMBE Proceedings
    Volume23
    ISSN (Print)1680-0737

    Other

    Other13th International Conference on Biomedical Engineering, ICBME 2008
    CountrySingapore
    Period12/3/0812/6/08

    All Science Journal Classification (ASJC) codes

    • Bioengineering
    • Biomedical Engineering

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