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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

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  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

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  4. Article ; Online: Does a micro-grooved trunnion stem surface finish improve fixation and reduce fretting wear at the taper junction of total hip replacements? A finite element evaluation.

    Ashkanfar, Ariyan / Langton, David J / Joyce, Thomas J

    Journal of biomechanics

    2017  Volume 63, Page(s) 47–54

    Abstract: The generation of particulate debris at the taper junction of total hip replacements (THRs), can cause failure of the artificial hip. The taper surfaces of femoral heads and trunnions of femoral stems are generally machined to a certain roughness to ... ...

    Abstract The generation of particulate debris at the taper junction of total hip replacements (THRs), can cause failure of the artificial hip. The taper surfaces of femoral heads and trunnions of femoral stems are generally machined to a certain roughness to enhance fixation. However, the effect of the surface roughness of these surfaces on the fixation, wear and consequently clinical outcomes of the design is largely unknown. In this study, we asked whether a micro-grooved trunnion surface finish (1) improves the fixation and (2) reduces the wear rate at the taper junction of THRs. We used 3D finite element (FE) models of THRs to, firstly, investigate the effect of initial fixation of a Cobalt-Chromium femoral head with a smooth taper surface mated with a Titanium (1) micro-grooved and (2) smooth, trunnion surface finishes. Secondly, we used a computational FE wear model to compare the wear evolution between the models, which was then validated against wear measurements of the taper surface of explanted femoral heads. The fixation at the taper junction was found to be better for the smooth couplings. Over a 7 million load cycle analysis in-silico, the linear wear depth and the total material loss was around 3.2 and 1.4 times higher for the femoral heads mated with micro-grooved trunnions. It was therefore concluded that smooth taper and trunnion surfaces will provide better fixation at the taper junction and reduce the volumetric wear rates.
    MeSH term(s) Arthroplasty, Replacement, Hip ; Femur/surgery ; Finite Element Analysis ; Hip Prosthesis ; Humans ; Models, Biological ; Prosthesis Design ; Prosthesis Failure ; Surface Properties
    Language English
    Publishing date 2017-08-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 218076-5
    ISSN 1873-2380 ; 0021-9290
    ISSN (online) 1873-2380
    ISSN 0021-9290
    DOI 10.1016/j.jbiomech.2017.07.027
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  5. Article ; Online: A large taper mismatch is one of the key factors behind high wear rates and failure at the taper junction of total hip replacements: A finite element wear analysis.

    Ashkanfar, Ariyan / Langton, David J / Joyce, Thomas J

    Journal of the mechanical behavior of biomedical materials

    2017  Volume 69, Page(s) 257–266

    Abstract: Total hip replacement (THR) is one of the most successful orthopaedic surgeries; however, failures can occur due to adverse reactions to wear debris. Recently, a large number of failures linked to the release of metal particles from the taper junction ... ...

    Abstract Total hip replacement (THR) is one of the most successful orthopaedic surgeries; however, failures can occur due to adverse reactions to wear debris. Recently, a large number of failures linked to the release of metal particles from the taper junction between femoral head and femoral stem have been reported. One possible reason for this may be design variations such as taper mismatches associated with the taper and trunnion angles. Could a large taper mismatch lead to inappropriate contact mechanics and increase relative micromotion and thus wear? In this study, 3D finite element (FE) models of a commercial THR from a perfectly matched interface to large taper mismatches and a wear algorithm were used to investigate the extent of wear that could occur at this junction and identify the optimum tolerances in order to reduce the wear. A co-ordinate measuring machine (CMM) was used to analyse the wear depth and volumetric wear rate of the tapers of 54 explanted 36mm diameter Cobalt Chromium femoral heads, which had been in service for 5.1 years in average, to validate the FE analyses. It was found that a large taper mismatch (e.g. 9.12´) results in a high wear rate (2.960mm
    Language English
    Publishing date 2017-05
    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.2017.01.018
    Database MEDical Literature Analysis and Retrieval System OnLINE

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