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    Volume 49, Issue 6 (January 2021)

    Surface Finish of Total Hip Arthroplasty Implants: Are We Evaluating and Manufacturing Them Appropriately?

    (Received 2 June 2020; accepted 28 September 2020)

    Published Online: 25 January 2021

    CODEN: JTEVAB

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    Abstract

    A recent change in the ISO 7206-2, Implants for Surgery – Partial and Total Hip Joint Prostheses – Part 2: Articulating Surfaces Made of Metallic, Ceramic and Plastics Materials, with regard to hip joint prostheses, altered the recommended cutoff for measuring the roughness of the articulating surfaces of the femoral head and acetabular cup but did not encompass two key sites: the bore head and the trunnion. The aim of this study was to evaluate whether the standardized parameters and sites established in ISO 7206-2 are appropriate for evaluating the quality of the surface finish of total hip arthroplasty implants. Three kits containing the polymeric acetabular components, metallic heads, and stems from 5 manufacturers were used for testing. Contact profilometry was performed on the internal acetabular cup, external head, head bore, and trunnion surfaces. Additionally, the external head surface was evaluated with an interferometer to increase the accuracy. The evaluation of the external surface of the femoral head with a profilometer seems to be inadequate, because of a limitation of the contact method associated with highly polished surfaces. The average roughness (Ra) values obtained with an interferometer were lower than those measured with the profilometer and revealed significant differences between the manufacturers. The use of an 0.80-mm cutoff is more appropriate for the Ra range normally found for acetabular cups, enhancing the power to detect acetabular cups with inadequate roughness. The absence of a standard for the surface finish of the stem-head interface generates heterogeneity between manufacturers and between samples produced by a single manufacturer, revealing a lack of quality control.

    Author Information:

    Cubillos, Patricia O.
    Biomechanical Engineering Laboratory (LEBm) of University Hospital, Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina

    dos Santos, Vinícius O.
    Biomechanical Engineering Laboratory (LEBm) of University Hospital, Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina

    Pizzolatti, André L. A.
    Biomechanical Engineering Laboratory (LEBm) of University Hospital, Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina

    O. Moré, Ari D.
    Biomechanical Engineering Laboratory (LEBm) of University Hospital, Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina

    Polydoro Ernani de São Thiago University Hospital, Federal University of Santa Catarina, Florianópolis, Santa Catarina

    M. Roesler, Carlos R.
    Biomechanical Engineering Laboratory (LEBm) of University Hospital, Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina


    Stock #: JTE20200357

    ISSN:0090-3973

    DOI: 10.1520/JTE20200357

    Author
    Title Surface Finish of Total Hip Arthroplasty Implants: Are We Evaluating and Manufacturing Them Appropriately?
    Symposium ,
    Committee F04