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  1. Article ; Online: The impact of femoral head size on the wear evolution at contacting surfaces of total hip prostheses: A finite element analysis.

    Ashkanfar, Ariyan / Toh, Shawn Ming Song / English, Russell / Langton, David J / Joyce, Thomas J

    Journal of the mechanical behavior of biomedical materials

    2024  Volume 153, Page(s) 106474

    Abstract: Total Hip Arthroplasty has been a revolutionary technique in restoring mobility to patients with damaged hip joints. The introduction of modular components of the hip prosthesis allowed for bespoke solutions based on the requirements of the patient. The ... ...

    Abstract Total Hip Arthroplasty has been a revolutionary technique in restoring mobility to patients with damaged hip joints. The introduction of modular components of the hip prosthesis allowed for bespoke solutions based on the requirements of the patient. The femoral stem is designed with a conical trunnion to allow for assembly of different femoral head sizes based on surgical requirements. The femoral head diameters for a metal-on-polyethylene hip prosthesis have typically ranged between 22 mm and 36 mm and are typically manufactured using Cobalt-Chromium alloy. A smaller femoral head diameter is associated with lower wear of the polyethylene, however, there is a higher risk of dislocation. In this study, a finite element model of a standard commercial hip arthroplasty prosthesis was modelled with femoral head diameters ranging from 22 mm to 36 mm to investigate the wear evolution and material loss at both contacting surfaces (acetabular cup and femoral stem trunnion). The finite element model, coupled with a validated in-house wear algorithm modelled a human walking for 10 million steps. The results have shown that as the femoral head size increased, the amount of wear on all contacting surfaces increased. As the femoral head diameter increased from 22 mm to 36 mm, the highly cross-linked polyethylene (XLPE) volumetric wear increased by 61% from 98.6 mm
    MeSH term(s) Humans ; Arthroplasty, Replacement, Hip ; Hip Prosthesis ; Femur Head ; Finite Element Analysis ; Prosthesis Design ; Prosthesis Failure ; Polyethylene ; Chromium Alloys
    Chemical Substances Polyethylene (9002-88-4) ; Chromium Alloys
    Language English
    Publishing date 2024-02-25
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2378381-3
    ISSN 1878-0180 ; 1751-6161
    ISSN (online) 1878-0180
    ISSN 1751-6161
    DOI 10.1016/j.jmbbm.2024.106474
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: How does bicycling affect the longevity of Total Hip Arthroplasty? A finite element wear analysis.

    Toh, Shawn Ming Song / Ashkanfar, Ariyan / English, Russell / Rothwell, Glynn / Langton, David J / Joyce, Thomas J

    Journal of the mechanical behavior of biomedical materials

    2023  Volume 139, Page(s) 105673

    Abstract: As the number of young and active individuals undergoing Total Hip Arthroplasty (THA) are increasing yearly, there is a need for hip prostheses to have increased longevity. Current investigations into the longevity of these prostheses only include ... ...

    Abstract As the number of young and active individuals undergoing Total Hip Arthroplasty (THA) are increasing yearly, there is a need for hip prostheses to have increased longevity. Current investigations into the longevity of these prostheses only include walking as the patient's activity as there is limited data on the amount and intensity of other activity performed by the patient. To further understand the evolution of wear and increase the longevity of these implants, the impact of different activities on the hip prosthesis needs to be investigated. In this study, a finite element model and wear algorithm was developed to simulate both walking and bicycling over a 5-year period. The XLPE acetabular cup volumetric wear rate was found to be 33 mm
    MeSH term(s) Humans ; Arthroplasty, Replacement, Hip ; Finite Element Analysis ; Bicycling ; Prosthesis Failure ; Prosthesis Design ; Hip Prosthesis ; Polyethylene
    Chemical Substances Polyethylene (9002-88-4)
    Language English
    Publishing date 2023-01-16
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2378381-3
    ISSN 1878-0180 ; 1751-6161
    ISSN (online) 1878-0180
    ISSN 1751-6161
    DOI 10.1016/j.jmbbm.2023.105673
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  3. Article ; Online: Computational method for bearing surface wear prediction in total hip replacements.

    Toh, Shawn Ming Song / Ashkanfar, Ariyan / English, Russell / Rothwell, Glynn

    Journal of the mechanical behavior of biomedical materials

    2021  Volume 119, Page(s) 104507

    Abstract: Total hip replacement (THR) is a revolutionary treatment when a hip joint becomes severely damaged. Wear is known as one of the main reasons for THR failure. Current experimental techniques to investigate the wear at the bearing surfaces of THRs are time- ...

    Abstract Total hip replacement (THR) is a revolutionary treatment when a hip joint becomes severely damaged. Wear is known as one of the main reasons for THR failure. Current experimental techniques to investigate the wear at the bearing surfaces of THRs are time-consuming, complicated and expensive. In this study, an in-house fretting wear algorithm has been further developed to investigate the wear damage that occurs on bearing surfaces of THRs and its consequence on the longevity of the implants. A 3D finite element model has been created with a 36 mm diameter Cobalt-Chromium femoral head and a 4 mm thick cross-linked polyethylene bearing liner. A gait loading cycle was used to simulate walking for up to 5 million cycles (Mc). The wear algorithm extracts relative displacements and contact shear stresses from the finite element package to predict the linear and volumetric wear rates. This method is shown to have modelled the evolution of wear effectively and found it to be similar to those from experimental analyses. The linear and volumetric wear per million cycles predicted in this study were 0.0375mm/Mc and 33.6mm
    MeSH term(s) Arthroplasty, Replacement, Hip ; Hip Joint ; Hip Prosthesis ; Humans ; Polyethylene ; Prosthesis Design ; Prosthesis Failure
    Chemical Substances Polyethylene (9002-88-4)
    Language English
    Publishing date 2021-04-08
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2378381-3
    ISSN 1878-0180 ; 1751-6161
    ISSN (online) 1878-0180
    ISSN 1751-6161
    DOI 10.1016/j.jmbbm.2021.104507
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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