Macroscopic assessment of cartilage shear: Effects of counter-surface roughness, synovial fluid lubricant, and compression offset

JOURNAL OF BIOMECHANICS

卷:43

Article

Nguyen, Quynhhoa T.¹  Wong, Benjamin L.¹  Chun, June¹  Yoon, Yeoung C.²  Talke, Frank E.²  Sah, Robert L.¹ 

[1] Univ Calif San Diego, Dept Bioengn, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Dept Mech & Aerosp Engn, Ctr Magnet Recording Res, La Jolla, CA 92093 USA

关键词: Cartilage;    Biomechanics;    Shear;    Surface roughness;    Friction;   

DOI  :  10.1016/j.jbiomech.2010.02.014

来源: Elsevier

【 摘 要 】

During joint articulation, cartilage is subjected to compression, shear, and sliding, mechanical factors that regulate and affect cartilage metabolism. The objective of this study was to use an in vitro material-on-cartilage shear test to elucidate the effects of counter-surface roughness (Polished, Mildly rough, and Rough), lubricants (phosphate buffered saline (PBS) and bovine synovial fluid (bSF)), and compression offset on the shearing and sliding of normal human talar cartilage under dynamic lateral displacement. Peak shear stress (sigma(xz,m)) and strain (E-xz,E-m) increased with increasing platen roughness and compression offset, and were 30% higher with PBS than with bSF. Compared to PBS, bSF was more effective as a lubricant for P than for M and R platens as indicated by the higher reduction in kinetic friction coefficient (-60% vs. -20% and -19%, respectively), sigma(xz,m) (-50% vs. -14% and -17%) and E-xz,E-m (-54% vs. -19% and -17%). Cartilage shear and sliding were evident for all counter-surfaces either at low compression offset (10%) or with high lateral displacement (70%), regardless of lubricant. An increase in tissue shear occurred with either increased compression offset or increased surface roughness. This material and biomechanical test system allow control of cartilage sigma(xz,m) and E-xz,E-m, and hence, sliding magnitude, for an imposed lateral displacement. It therefore can facilitate study of cartilage mechanobiological responses to distinct regimes of cartilage loading and articulation, such as shear with variable amounts of sliding. (C) 2010 Elsevier Ltd. All rights reserved.

【 授权许可】

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