Prediction of lubrication regimes in wrist implants with spherical bearing surfaces

T. Pylios, Duncan Eoin Thomson Shepherd

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    The wrist joint is frequently affected by rheumatoid arthritis, resulting in wrist pain, deformity and ultimately loss of function. Artificial wrist implants have been introduced to treat the rheumatoid wrist, to attempt to alleviate pain and restore some function to the joint. The aim of this study was to predict the likely lubrication regimes that occur in wrist implants with spherical bearing surfaces. The implant was modelled as an equivalent ball-on-plane. Elastohydrodynamic lubrication theory was used to determine the minimum film thickness for the implant under different load, entraining velocity, lubricant viscosity, size of implant and material combinations. The results show that the highest film thickness is found in large implants, with high viscosity, high entraining velocity and low load. Hard-on-soft material combinations will operate with a boundary lubrication regime. Material combinations involving ceramic bearing surfaces have the potential to operate with a mixed lubrication regime. (C) 2003 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)405-411
    Number of pages6
    JournalJournal of Biomechanics
    Volume37
    Issue number3
    DOIs
    Publication statusPublished - 2004

    Keywords

    • arthroplasty
    • implant
    • lubrication
    • wrist
    • HIP-JOINT REPLACEMENTS
    • ARTHROPLASTY
    • TRANSMISSION
    • FORCE

    Cite this

    Prediction of lubrication regimes in wrist implants with spherical bearing surfaces. / Pylios, T.; Shepherd, Duncan Eoin Thomson.

    In: Journal of Biomechanics, Vol. 37, No. 3, 2004, p. 405-411.

    Research output: Contribution to journalArticle

    Pylios, T. ; Shepherd, Duncan Eoin Thomson. / Prediction of lubrication regimes in wrist implants with spherical bearing surfaces. In: Journal of Biomechanics. 2004 ; Vol. 37, No. 3. pp. 405-411.
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    abstract = "The wrist joint is frequently affected by rheumatoid arthritis, resulting in wrist pain, deformity and ultimately loss of function. Artificial wrist implants have been introduced to treat the rheumatoid wrist, to attempt to alleviate pain and restore some function to the joint. The aim of this study was to predict the likely lubrication regimes that occur in wrist implants with spherical bearing surfaces. The implant was modelled as an equivalent ball-on-plane. Elastohydrodynamic lubrication theory was used to determine the minimum film thickness for the implant under different load, entraining velocity, lubricant viscosity, size of implant and material combinations. The results show that the highest film thickness is found in large implants, with high viscosity, high entraining velocity and low load. Hard-on-soft material combinations will operate with a boundary lubrication regime. Material combinations involving ceramic bearing surfaces have the potential to operate with a mixed lubrication regime. (C) 2003 Elsevier Ltd. All rights reserved.",
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