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A Proposed Model of Boundary Lubrication by Synovial Fluid: Structuring of Boundary Water
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1979
Year
Tissue EngineeringEngineeringFluid MechanicsMechanical EngineeringWettingBiomaterials DesignBiomedical EngineeringOrthopaedic SurgeryMusculoskeletal ResearchHydration ShellsBiomechanicsOsteoarthritisRheologyBoundary WaterBoundary LubricationHydrodynamic LubricationMusculoskeletal TissuePiston-ring LubricationMultiphase FlowTribological PropertySynovial FluidHydration ShellFluid-solid InteractionMedicine
On the basis of data obtained from in-vitro friction tests using both cartilage and widely differing artificial surfaces, a general model for boundary lubrication of joint cartilage by synovial fluid is presented. It postulates that one portion of the synovial lubricating glycoprotein (LGP) is adsorbed to the surface. Reduction in surface shear is accomplished by formation of hydration shells about the polar portions of the adsorbed LGP creating a thin layer of viscous structured water at the surface. Mutual electrostatic repulsion between charged polysaccharide moieties aids in separation of the adsorbed surface layers. The hydration shell also serves as a check valve to control the movement of water out of and into the cartilage matrix during motion.