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Original Paper

Finite Element Modeling Predictions of Region-specific Cell-matrix Mechanics in the Meniscus

Maureen L. Upton1, Farshid Guilak1, 2, Tod A. Laursen1, 2 Contact Information and Lori A. SettonContact Information

(1)  Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Durham, NC 27708, USA
(2)  Division of Orthopaedic Surgery, Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
(3)  Departments of Civil and Environmental Engineering, Duke University, Durham, NC 27708, USA

Received: 23 April 2005  Accepted: 3 August 2005  Published online: 7 March 2006

Abstract  The knee meniscus exhibits significant spatial variations in biochemical composition and cell morphology that reflect distinct phenotypes of cells located in the radial inner and outer regions. Associated with these cell phenotypes is a spatially heterogeneous microstructure and mechanical environment with the innermost regions experiencing higher fluid pressures and lower tensile strains than the outer regions. It is presently unknown, however, how meniscus tissue mechanics correlate with the local micromechanical environment of cells. In this study, theoretical models were developed to study mechanics of inner and outer meniscus cells with varying geometries. The results for an applied biaxial strain predict significant regional differences in the cellular mechanical environment with evidence of tensile strains along the collagen fiber direction of ~0.07 for the rounded inner cells, as compared to levels of 0.02–0.04 for the elongated outer meniscus cells. The results demonstrate an important mechanical role of extracellular matrix anisotropy and cell morphology in regulating the region-specific micromechanics of meniscus cells, that may further play a role in modulating cellular responses to mechanical stimuli.

Contact Information Tod A. Laursen (Corresponding author)
Email: setton@duke.edu

Contact Information Lori A. Setton (Corresponding author)
Email: setton@duke.edu
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Referenced by
3 newer articles

  1. Cao, Li (2009) Pericellular Matrix Mechanics in the Anulus Fibrosus Predicted by a Three-Dimensional Finite Element Model and In Situ Morphology. Cellular and Molecular Bioengineering
    [CrossRef]
  2. Sanchez-Adams, Johannah (2009) The Knee Meniscus: A Complex Tissue of Diverse Cells. Cellular and Molecular Bioengineering
    [CrossRef]
  3. Ateshian, Gerard A. (2006) Special Issue on Cartilage (Part II). Biomechanics and Modeling in Mechanobiology
    [CrossRef]
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