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Finite Element Modeling Predictions of Region-specific Cell-matrix Mechanics in the Meniscus
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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 and Lori A. Setton3 
| (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.
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