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Unformatted text preview: icial joints? • If injection of hyaluronic acid helps the patient with osteoarthritis would it help the total joint replacement patient? Page 10 Image removed due to copyright restrictions. Diagram explaining coefficient of friction in artifical ball/socket joint. Example Coefficients of Friction Cartilage - Cartilage: 0.002 - 0.004 Metal - Metal (dry): 0.4 Metal - Metal (saline): 0.15-0.35 Metal - UHMWPE (serum): 0.05-0.15 Cartilage Image removed due to copyright restrictions. Cartilage-lined knee joint. Bone Figure by MIT OCW. Mechanism of lubrication? Page 11 Several Mechanisms of Lubrication in the Joint • Boundary layer lubrication at the surface. • Fluid-film (hydrodynamic) lubrication in regions where surfaces are separated - also elastohydrodynamic and weeping lubrication. Articular Surface Lubricating Proteins or Phospholipids Articular Surface Boundary Layer Lubrication of Articular Cartilage • The load is supported by a monolayer of the lubricating molecules adsorbed to the surface of the cartilage. Page 12 LUBRICATION OF NATURAL AND LUBRICATION...
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This note was uploaded on 11/11/2011 for the course BIO 2.797j taught by Professor Matthewlang during the Fall '06 term at MIT.

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