Direct Measurement of the Poisson’s Ratio of Human Patella Cartilage in Tension

[+] Author and Article Information
Dawn M. Elliott

McKay Orthopaedic Research Laboratory, University of Pennsylvania, Philadelphia, PA 19104-6081e-mail: delliott@mail.med.upenn.edu

Daria A. Narmoneva

Department of Mechanical Engineering, Massachusetts Institute of Technology, Boston, MA

Lori A. Setton

Department of Biomedical Engineering, Duke University, Durham, NC

J Biomech Eng 124(2), 223-228 (Mar 29, 2002) (6 pages) doi:10.1115/1.1449905 History: Received November 29, 2000; Revised December 05, 2001; Online March 29, 2002
Copyright © 2002 by ASME
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Correlation between linear modulus (E) and age in the surface and middle zone
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Schematic of human patella showing the site of mechanical test sample and histologic section
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Principal components of infinitesimal strain in the longitudinal (εyy) and transverse (εxx) directions for a representative sample from the cartilage surface zone. Data points represent mean values for all triads at each applied grip strain (ε), and lines represent linear regressions.
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Representative human patellar cartilage histological section stained with toluidine blue from a 66-yr old (A), and a 76-yr old (B)
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Average tensile stress-strain response for patella articular cartilage in the surface zone and middle zone. Surface zone samples (shown as solid line) grouped according to age, a—under 70-yr old (n=5),b—over 70-yr old (n=3). Middle zone samples (shown as dash line) combined for all ages (n=10). Error bars represent one standard deviation in stress.




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