The effect of different assembly loads on taper junction fretting wear in total hip replacements

English, Russell; Ashkanfar, Ariyan; Rothwell, Glynn

doi:10.1016/j.triboint.2015.11.025

Cited by 52 publications

(37 citation statements)

References 21 publications

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“…The variation of this parameter during wear analysis has already been presented in the previous studies (English et al, 2015(English et al, , 2016. As such, the wear evolution is just presented here for clarity.…”

Section: Finite Element Wear Analysismentioning

confidence: 94%

“…A previous study has shown that an increase in assembly force results in a reduction in fretting wear (English et al, 2016). It was recommended that a 4 kN initial assembly force is required to minimise the wear rates.…”

Section: Finite Element Wear Analysismentioning

confidence: 99%

“…As discussed, the wear algorithm has been optimised in this study, which runs faster than in the previous studies (English et al, 2015(English et al, , 2016. The time taken for each wear analysis over 10 million walking cycles is now less than 440 hours, executed on a 64-bit Windows 7…”

Section: Finite Element Wear Analysismentioning

confidence: 99%

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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

Langton

Joyce

2017

Journal of the Mechanical Behavior of Biomedical Materials

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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.http://researchonline.ljmu.ac.uk/5442/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Users may download and/or print one copy of any article(s) in LJMU Research Online to facilitate their private study or for non-commercial research. You may not engage in further distribution of the material or use it for any profit-making activities or any commercial gain.The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 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 3 per million load cycles). Such wear rates can have a major negative effect on the clinical outcomes of these implants. It was also found that even a slight reduction in mismatch significantly reduced the magnitude of the wear rates (0.069mm 3 per million load cycles on average for 6´ taper mismatch). It is recommended that the cone angles of femoral head and femoral trunnion should be manufactured to produce a taper mismatch of less than 6´ at the taper junction.

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Section: Finite Element Wear Analysismentioning

confidence: 94%

Section: Finite Element Wear Analysismentioning

confidence: 99%

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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

Langton

Joyce

2017

Journal of the Mechanical Behavior of Biomedical Materials

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“…An average element edge length of 0.9 mm was found to provide convergence for all test conditions. The contact interaction between the head taper and trunnion was modelled using a finite sliding formulation with a surface‐to‐surface discretization and a constant friction coefficient of 0.21 …”

Section: Methodsmentioning

confidence: 99%

“…The “prosim” load profile simulated the loading profile exerted by a hip simulator which applies dual axes rotations, namely, F/E and internal/external rotation . The loads for each of these profiles were applied to a reference point, coupled to the head taper and trunnion surfaces, located in the center of the head [Figure (b)]. For all loading conditions, the assembly was constrained by creating a second reference point in the head center, constraining it in three degrees of translation ( U 1 = U 2 = U 3 = 0) and kinematically coupling it to the bearing surface of the femoral head, thereby precluding the need to include an acetabular liner in the model …”

Section: Methodsmentioning

confidence: 99%

Prediction of taper performance using quasi static FE models: The influence of loading, taper clearance and trunnion length

Raji

Shelton

2018

J Biomed Mater Res

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The head-neck taper junction has been widely reported to corrode leading to adverse tissue reactions. Taper corrosion is a poorly understood phenomenon but has been associated with oxide layer damage and ingress of corrosive physiological fluids. Micromotion may damage the oxide layer; although little is understood about the prevailing stresses which cause this. The ingress of fluid around the joint space into the taper will depend on the taper contact position and the separation of the interfaces during loading. The current work reports on the effect of taper clearances and trunnion length on the taper surface stresses and the taper gap opening. These were determined for CoCr/Ti taper interfaces using FE under loading conditions including walking and stair climb as well as hip simulator load profiles. Shorter trunnions and stair climb loading were shown to generate the greatest taper gaps (82 µm) and also the largest surface stresses (1200 MPa) on the head taper. The largest taper gaps were associated with smaller taper contact areas. Clearances within ±0.1° had no effect on the taper gaps generated, as the tapers engaged over comparable lengths; the taper gap opening was dependent upon the taper engagement length rather than location (proximal or distal) of contact. The walking profile or variants applied by hip simulators, was insufficient to differentiate between taper designs and evaluate differences in the magnitudes of taper gaps. The use of more demanding activity such as stair climb during in vitro evaluations could provide better predictions of taper performance in vivo. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2018.

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Pre‐clinical evaluation of fretting‐corrosion at stem‐head and stem‐cement interfaces of hip implants using in vitro and in silico models

et al. 2022

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Prior to clinical use, the corrosion resistance of new prosthesis system must be verified. The fretting‐corrosion mechanisms of total hip arthroplasty (THA) implants generate metal debris and ions that can increase the incidence of adverse tissue reactions. For cemented stems, there are at least two interfaces that can be damaged by fretting‐corrosion: stem‐head and stem‐cement. This investigation aimed to evaluate, through in vitro and in silico analyses, fretting‐corrosion at the stem‐head and stem‐cement interfaces, to determine which surface is most affected in pre‐clinical testing and identify the causes associated with the observed behavior. Unimodular stems and femoral heads of three different groups were evaluated, defined according to the head/stem material as group I (SS/SS), group II (CoCr/SS), and group III (CoCr/CoCr). Seven pairs of stems and heads per group were tested: three pairs were subjected to material characterization, three pairs to in vitro fretting‐corrosion testing, and one pair to geometric modeling in the in silico analysis. The absolute area of the stem body degraded was more than three times higher compared with the trunnion, for all groups. These results were corroborated by the in silico analysis results, which revealed that the average micromotion at the stem‐cement interface (9.65–15.66 μm) was higher than that at the stem‐head interface (0.55–1.08 μm). In conclusion, the degradation of the stem‐cement interface is predominant in the pre‐clinical set, indicating the need to consider the fretting‐corrosion at the stem‐cement interface during pre‐clinical implant evaluations.

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The effect of different assembly loads on taper junction fretting wear in total hip replacements

Cited by 52 publications

References 21 publications

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

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

Prediction of taper performance using quasi static FE models: The influence of loading, taper clearance and trunnion length

Pre‐clinical evaluation of fretting‐corrosion at stem‐head and stem‐cement interfaces of hip implants using in vitro and in silico models

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