Meniscus and cartilage exhibit distinct intra-tissue strain distributions under unconfined compression.

Osteoarthritis and Cartilage
J H Lai, M E Levenston

Abstract

To examine the functional behavior of the surface layer of the meniscus by investigating depth-varying compressive strains during unconfined compression. Pairs of meniscus and articular cartilage explants (n=12) site-matched at the tibial surfaces were subjected to equilibrium unconfined compression at 5, 10, 15, and 20% compression under fluorescence imaging. Two-dimensional (2D) deformations were tracked using digital image correlation (DIC). For each specimen, local compressive engineering strains were determined in 200 μm layers through the depth of the tissue. In samples with sharp strain transitions, bilinear regressions were used to characterize the surface and interior tissue compressive responses. Meniscus and cartilage exhibited distinct depth-dependent strain profiles during unconfined compression. All cartilage explants had elevated compressive engineering strains near the surface, consistent with previous reports. In contrast, half of the meniscus explants tested had substantially stiffer surface layers, as indicated by surface engineering strains that were ∼20% of the applied compression. In the remaining samples, surface and interior engineering strains were comparable. 2D Green's strain maps revealed highly hete...Continue Reading

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Citations

Jul 3, 2013·Journal of the Mechanical Behavior of Biomedical Materials·Andreas Martin SeitzLutz Dürselen
Nov 5, 2013·Journal of Biomechanics·E K DansoR K Korhonen
Mar 20, 2013·Computational and Mathematical Methods in Medicine·M KazemiL P Li
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Jul 8, 2011·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·An M Nguyen, Marc E Levenston
Feb 1, 2012·Osteoarthritis and Cartilage·J F Nishimuta, M E Levenston
Mar 4, 2015·Journal of Biomechanics·Amy L McNulty, Farshid Guilak
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Oct 30, 2016·Journal of Applied Biomaterials & Functional Materials·Luca ColuccinoLuca Ceseracciu
May 24, 2019·Osteoarthritis and Cartilage·F MaierD M Pierce

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