Human ankle joint lubrication in walking is analyzed. A biphasic mixture model is considered for articular cartilage (ideal interstitial fluid and elastic porous matrix that is transversely isotropic and inhomogeneous throughout its thickness). Synovial fluid is considered Newtonian. Its viscosity is due to the macromolecules of hyaluronic acid that are too large to enter the matrix pores. Due to the fluid pressure gradient water and small solutes pass through the matrix pores and across the articular surface in both directions. The effect of the time varying concentration of hyaluronic acid or of the synovial fluid viscosity on the synovial film thickness distribution is small and neglected in the model. Periodic sliding motion of the articular surfaces and periodic loading of the joint as encountered in walking are included in the analysis. Synovial fluid serves as a fluid lubricant. The model shows that soon after the onset of walking the normal human ankle joint works in a mixed lubrication mode (a combination of boundary and fluid-film lubrications). A protective gel layer formed in the gap due to the synovial fluid filtration by cartilage may serve as a boundary lubricant. The synovial gel layer is not guaranteed in the osteoarthritic case, and the rough sliding surfaces may get repeatedly into an intimate contact and wear off due to the reciprocating sliding motion.
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January 2010
Research Papers
Lubrication of the Human Ankle Joint in Walking
Miroslav Hlaváček
Miroslav Hlaváček
Institute of Theoretical and Applied Mechanics,
e-mail: hlavacek@itam.cas.cz
Academy of Sciences of the Czech Republic
, Prosecká 76, 19000 Prague 9, Czech Republic
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Miroslav Hlaváček
Institute of Theoretical and Applied Mechanics,
Academy of Sciences of the Czech Republic
, Prosecká 76, 19000 Prague 9, Czech Republice-mail: hlavacek@itam.cas.cz
J. Tribol. Jan 2010, 132(1): 011201 (8 pages)
Published Online: November 11, 2009
Article history
Received:
April 10, 2009
Revised:
August 31, 2009
Online:
November 11, 2009
Published:
November 11, 2009
Citation
Hlaváček, M. (November 11, 2009). "Lubrication of the Human Ankle Joint in Walking." ASME. J. Tribol. January 2010; 132(1): 011201. https://doi.org/10.1115/1.4000278
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