Investigation of Taper Failure in a Contemporary Metal-on-Metal Hip Arthroplasty System Through Examination of Unused and Explanted Prostheses

Langton, David; Ahmed, Imran; Avery, Peter; Bone, Martin C; Cooke, Nicholas; Deehan, David J.; Duffy, Patrick; Foguet, Pedro; Green, Stephen; Holland, J; Jafri, A.; Longstaff, Lee M.; Lord, J; Loughead, Jonathan; Meek, R.M. Dominic; Murray, H.M.; Nanu, A.; Nargol, Avf; Scholes, S C; Sidaginamale, R; Waller, Sarah; Joyce, Thomas J.

doi:10.2106/jbjs.15.00917

Cited by 25 publications

(22 citation statements)

References 22 publications

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“…A total of 10 measurements on each articulating sample were acquired using a 10× objective lens and 2.0× manual zoom (area of view 317 × 238 μm). A two‐dimensional (2D) contacting profilometer (Mitutoyo Surftest SJ‐210) was used for the surface roughness (Ra) analysis of the tapers and trunnions in both tests . Six linear scans for each taper and trunnion were performed with a cut off length of 0.8 mm, giving each scan a total roughness evaluation trace length of 4.0 mm .…”

Section: Methodsmentioning

confidence: 99%

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

Bhalekar¹,

Smith²,

Joyce³

2018

J Biomed Mater Res

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Ceramic-on-ceramic (CoC) total hip replacements (THR) have a substantially lower wear rate than metal-on-polyethylene (MoP) hips, as shown by hip simulator testing. However, the revision rates of CoC and MoP hips are comparable. To try and explain this discrepancy the wear, at both the bearing surfaces and taper-trunnion interface of 36 mm BIOLOXdelta CoC THRs, mounted on 12/14 titanium (Ti6Al4V) trunnions was investigated using a hip simulator (n = 3) and a dynamically loaded CoC sample in a separate test station. Wear was assessed gravimetrically and surface roughness measurements of the articulating and taper surfaces taken at regular intervals. Scanning electron microscopy, surface roughness, and gravimetric measurements of trunnions was performed. After 5 million cycles, the mean total wear from the ceramic articulating surfaces was 0.25 mm from the hip simulator test, and that from the titanium trunnions was 0.29 mm . This metal wear may provide an explanation for adverse reaction to metal debris found in contemporary CoC hip joints. It is therefore vital to consider taper-trunnion wear in preclinical testing of artificial hip joints. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res B Part B, 2018.

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Section: Methodsmentioning

confidence: 99%

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

Bhalekar¹,

Smith²,

Joyce³

2018

J Biomed Mater Res

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“…There is a wide variation in the manufacturing tolerances of the taper and trunnion angles of THRs. Langton et al (2016) showed taper angles ranged from 5°32´ to 5°42´ for 93 "Articuleze" (DePuy) femoral heads. Brock et al (2015) showed a range of 5°56´ to 6°9´ for S-ROM (DePuy) trunnion angles and 5°33´ to 5°47´ for Corail (DePuy) trunnion angles.…”

Section: Finite Element Wear Analysismentioning

confidence: 99%

“…Langton et al (2012) have shown varus stems, larger head diameters and head offsets increase the horizontal moment arm acting at the taper junction, which increases the fretting wear rate at this junction. They further showed a wide variation in the manufacturing tolerances of the taper and trunnion angles of one manufacturer's THRs (Langton et al, 2016). They analysed 93 retrieved head tapers and found that many of the tapers had not been manufactured to specifications.…”

Section: Introductionmentioning

confidence: 99%

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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“…Despite the many advantages of femoral component modularity, it introduces another contact interface which may lead to wear particle generation. Recently, many reports have identified THR failure with taper junction wear (Brock et al, 2015;Crowninshield et al, 2004;Esposito et al, 2014;Kop et al, 2012;Langton et al, 2012;Langton et al, 2016;Langton et al, 2008;Lavigne et al, 2011;Panagiotidou et al, 2013;Smith et al, 2005). This is fretting wear and is a result of contact stress and relative micromotion at the taper-trunnion interface of THRs (Delaunay et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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

Langton

Joyce

2017

Journal of Biomechanics

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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.

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Investigation of Taper Failure in a Contemporary Metal-on-Metal Hip Arthroplasty System Through Examination of Unused and Explanted Prostheses

Abstract: This study shows evidence that previously unappreciated variations in manufacturing processes may have a major impact on the clinical outcomes of patients.

Cited by 25 publications

References 22 publications

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

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

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

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