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    Effects of Inserting a Pressensor Film Into Articular Joints on the Actual Contact Mechanics

    Source: Journal of Biomechanical Engineering:;1998:;volume( 120 ):;issue: 005::page 655
    Author:
    J. Z. Wu
    ,
    W. Herzog
    ,
    M. Epstein
    DOI: 10.1115/1.2834758
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Fuji film has been widely used in studies aimed at obtaining the contact mechanics of articular joints. Once sealed for practical use in biological joints, Fuji Pressensor film has a total effective thickness of 0.30 mm, which is comparable to the cartilage thickness in the joints of many small animals. The average effective elastic modulus of Fuji film is approximately 100 MPa in compression, which is larger by a factor of 100–300 compared to that of normal articular cartilage. Therefore, inserting a Pressensor film into an articular joint will change the contact mechanics of the joint. The measurement precision of the Pressensor film has been determined systematically; however, the changes in contact mechanics associated with inserting the film into joints have not been investigated. This study was aimed at quantifying the changes in the contact mechanics associated with inserting sealed Fuji Pressensor film into joints. Spherical and cylindrical articular joint contact mechanics with and without Pressensor film and for varying degrees of surface congruency were analyzed and compared by using finite element models. The Pressensor film was taken as linearly elastic and the cartilage was assumed to be biphasic, composed of a linear elastic solid phase and an inviscid fluid phase. The present analyses showed that measurements of the joint contact pressures with Fuji Pressensor film will change the maximum true contact pressures by 10–26 percent depending on the loading, geometry of the joints, and the mechanical properties of cartilage. Considering this effect plus the measurement precision of the film (approximately 10 percent), the measured joint contact pressures in a joint may contain errors as large as 14–28 percent.
    keyword(s): Contact mechanics , Cartilage , Accuracy and precision , Thickness , Fluids , Measurement , Mechanical properties , Compression , Elastic moduli , Errors , Finite element model AND Geometry ,
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      Effects of Inserting a Pressensor Film Into Articular Joints on the Actual Contact Mechanics

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/120039
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    • Journal of Biomechanical Engineering

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    contributor authorJ. Z. Wu
    contributor authorW. Herzog
    contributor authorM. Epstein
    date accessioned2017-05-08T23:55:53Z
    date available2017-05-08T23:55:53Z
    date copyrightOctober, 1998
    date issued1998
    identifier issn0148-0731
    identifier otherJBENDY-26004#655_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/120039
    description abstractFuji film has been widely used in studies aimed at obtaining the contact mechanics of articular joints. Once sealed for practical use in biological joints, Fuji Pressensor film has a total effective thickness of 0.30 mm, which is comparable to the cartilage thickness in the joints of many small animals. The average effective elastic modulus of Fuji film is approximately 100 MPa in compression, which is larger by a factor of 100–300 compared to that of normal articular cartilage. Therefore, inserting a Pressensor film into an articular joint will change the contact mechanics of the joint. The measurement precision of the Pressensor film has been determined systematically; however, the changes in contact mechanics associated with inserting the film into joints have not been investigated. This study was aimed at quantifying the changes in the contact mechanics associated with inserting sealed Fuji Pressensor film into joints. Spherical and cylindrical articular joint contact mechanics with and without Pressensor film and for varying degrees of surface congruency were analyzed and compared by using finite element models. The Pressensor film was taken as linearly elastic and the cartilage was assumed to be biphasic, composed of a linear elastic solid phase and an inviscid fluid phase. The present analyses showed that measurements of the joint contact pressures with Fuji Pressensor film will change the maximum true contact pressures by 10–26 percent depending on the loading, geometry of the joints, and the mechanical properties of cartilage. Considering this effect plus the measurement precision of the film (approximately 10 percent), the measured joint contact pressures in a joint may contain errors as large as 14–28 percent.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleEffects of Inserting a Pressensor Film Into Articular Joints on the Actual Contact Mechanics
    typeJournal Paper
    journal volume120
    journal issue5
    journal titleJournal of Biomechanical Engineering
    identifier doi10.1115/1.2834758
    journal fristpage655
    journal lastpage659
    identifier eissn1528-8951
    keywordsContact mechanics
    keywordsCartilage
    keywordsAccuracy and precision
    keywordsThickness
    keywordsFluids
    keywordsMeasurement
    keywordsMechanical properties
    keywordsCompression
    keywordsElastic moduli
    keywordsErrors
    keywordsFinite element model AND Geometry
    treeJournal of Biomechanical Engineering:;1998:;volume( 120 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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