The temporal response of the friction coefficient of articular cartilage depends on the contact area

Michael J. Carter, Ines M. Basalo, Gerard A. Ateshian

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The hypothesis of this study is that the time constant for the transient increase in friction coefficient of articular cartilage under a constant load is proportional to the size of the contact area, as predicated by the dependence of the frictional response on interstitial fluid pressurization. This hypothesis is verified experimentally from measurements of the frictional response of bovine articular cartilage disks of three different diameters (4, 6 and 8 mm) against glass. At two different applied stresses (0.127 and 0.254 MPa), the coefficient of determination of a linear regression of the time constant versus the contact area yielded R2=0.892 and R2=0.979 (p<0.001). The results of this study provide a cogent explanation for the expectation that the friction coefficient in situ will not achieve the elevated equilibrium values observed under common testing conditions.

Original languageEnglish (US)
Pages (from-to)3257-3260
Number of pages4
JournalJournal of Biomechanics
Volume40
Issue number14
DOIs
StatePublished - Oct 12 2007

Keywords

  • Cartilage
  • Contact area
  • Friction
  • Interstitial fluid pressurization

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

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