Knoop microhardness anisotropy of the ovine radius

Philip Riches, Nicola Everitt, Donal McNally

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    The Knoop indenter has been used to characterise fully the Knoop microhardness (HK) anisotropy of compact bone. 2120 indentations were performed on mature ovine radii and a linear relationship was found between H
    K and the angle between the major diagonal of the indenter and the lamella boundaries (p@0.001). HK increased significantly with ash fraction (p@0.001), but decreased with atmospheric vapour pressure (p(0.05). A significant interaction was found between ash fraction and atmospheric vapour pressure (p(0.01). HK significantly varied with indentation position along the diaphysis and around the cortex (both p@0.001), however radial variation in H
    K was not statistically significant. The variation of ash fraction showed similar trends. These data show that HK varies similarly to Vickers microhardness, but in addition, can provide clear information on the anisotropy of Haversian bone
    without the need for excising many different indentation planes. A large number of indentations are required to obtain low type I and type II errors in the statistical analysis.
    LanguageEnglish
    Pages1551-1557
    Number of pages7
    JournalJournal of Biomechanics
    Volume33
    Issue number12
    DOIs
    Publication statusPublished - 2000

    Fingerprint

    Ashes
    Vapor Pressure
    Atmospheric Pressure
    Anisotropy
    Indentation
    Microhardness
    Sheep
    Diaphyses
    Vapor pressure
    Atmospheric pressure
    Statistical methods
    Bone

    Keywords

    • bone mechanics
    • Knoop
    • microhardness
    • anisotropy

    Cite this

    Riches, Philip ; Everitt, Nicola ; McNally, Donal. / Knoop microhardness anisotropy of the ovine radius. In: Journal of Biomechanics. 2000 ; Vol. 33, No. 12. pp. 1551-1557.
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    Knoop microhardness anisotropy of the ovine radius. / Riches, Philip; Everitt, Nicola; McNally, Donal.

    In: Journal of Biomechanics, Vol. 33, No. 12, 2000, p. 1551-1557.

    Research output: Contribution to journalArticle

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    AU - Riches, Philip

    AU - Everitt, Nicola

    AU - McNally, Donal

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    N2 - The Knoop indenter has been used to characterise fully the Knoop microhardness (HK) anisotropy of compact bone. 2120 indentations were performed on mature ovine radii and a linear relationship was found between HK and the angle between the major diagonal of the indenter and the lamella boundaries (p@0.001). HK increased significantly with ash fraction (p@0.001), but decreased with atmospheric vapour pressure (p(0.05). A significant interaction was found between ash fraction and atmospheric vapour pressure (p(0.01). HK significantly varied with indentation position along the diaphysis and around the cortex (both p@0.001), however radial variation in HK was not statistically significant. The variation of ash fraction showed similar trends. These data show that HK varies similarly to Vickers microhardness, but in addition, can provide clear information on the anisotropy of Haversian bonewithout the need for excising many different indentation planes. A large number of indentations are required to obtain low type I and type II errors in the statistical analysis.

    AB - The Knoop indenter has been used to characterise fully the Knoop microhardness (HK) anisotropy of compact bone. 2120 indentations were performed on mature ovine radii and a linear relationship was found between HK and the angle between the major diagonal of the indenter and the lamella boundaries (p@0.001). HK increased significantly with ash fraction (p@0.001), but decreased with atmospheric vapour pressure (p(0.05). A significant interaction was found between ash fraction and atmospheric vapour pressure (p(0.01). HK significantly varied with indentation position along the diaphysis and around the cortex (both p@0.001), however radial variation in HK was not statistically significant. The variation of ash fraction showed similar trends. These data show that HK varies similarly to Vickers microhardness, but in addition, can provide clear information on the anisotropy of Haversian bonewithout the need for excising many different indentation planes. A large number of indentations are required to obtain low type I and type II errors in the statistical analysis.

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