PMID: 9529933Apr 8, 1998Paper

The influence of articular surface incongruity on lubrication and contact pressure distribution of loaded synovial joints

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
M Hlavácek, D Vokoun

Abstract

In the model intended for short-term loading (such as during the walking cycle) of a human synovial joint in the lower extremities, cartilage lubricated by Newtonian synovial fluid is considered to be incompressible elastic and subchondral bone is considered to be rigid. The model is non-diffusional, i.e. no interstitial fluid flow occurs across the articular surfaces. A simple plane strain case of the human ankle joint is considered. For high steady loading applied in the centre of the stationary tibial arc and for steady sliding of the talar arc, this model shows that individual physiological variations in the geometry of the articular surfaces have only a small effect on the contact stress distribution and the fluid film thickness. If this load is applied eccentrically in the tibial arc, the contact pressure distribution varies more with surface geometry, but the minimum fluid film thickness differs little from that for symmetric loading. The maximum contact pressure is placed eccentrically in this case, but its value is changed only little when compared to the central loading of the same value. In order to explain different distribution patterns of subchondral bone mineralization, it is anticipated that the total load peaks...Continue Reading

References

Nov 1, 1990·Journal of Biomechanical Engineering·A W EberhardtV Vithoontien
Jul 1, 1984·Engineering in Medicine·J B MedleyV Wright
Jan 1, 1983·Engineering in Medicine·J B MedleyV Wright

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Citations

Sep 21, 2000·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·D V WaideA J Carr

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