Effect of manufacturing tolerances on the micromotion at the Morse taper interface in modular hip implants using the finite element technique

Shareef, N.; Levine, Danny L.

doi:10.1016/0142-9612(96)88713-8

Cited by 61 publications

(50 citation statements)

References 2 publications

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“…Higher surface roughness may locally increase and evenly distribute the contact pressure [2] and thus decrease micro-motions between both components. The reported effect of increased micro-motion and fretting depending on the cone angle difference [20,23] was not seen in this study. The implants showed different patterns with respect to progression in titanium release over time.…”

Section: Discussioncontrasting

confidence: 49%

Metal release and corrosion effects of modular neck total hip arthroplasty

Kretzer

Jakubowitz

Krachler

et al. 2009

International Orthopaedics (SICOT)

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Modular neck implants are an attractive treatment tool in total hip replacement. Concerns remain about the mechanical stability and metal ion release caused by the modular connection. Five different implant designs were investigated in an experimental set-up. In vivo conditions were simulated and the long-term titanium release was measured. Finally, the modular connections were inspected for corrosion processes and signs of fretting. No mechanical failure or excessive corrosion could be identified for the implants tested. The titanium releases measured were extremely low compared to in vivo and in vitro studies and were not in a critical range.Résumé Dans les prothèses totales de hanche l'utilisation d'implants avec col modulaire est d'une utilisation fré-quente et pratique. Néanmoins, cette utilisation laisse persister des doutes sur la stabilité mécanique et sur le relargage des ions métalliques. 5 différents implants ont été étudiés en reproduisant les conditions in vivo, en mesurant le relargage de titane et en évaluant la corrosion et les lésions du col. Ce travail n'a pas permis de mettre en évidence d'échec secondaire à une corrosion excessive, et les taux de titane sont restés extrêmement bas dans les limites de l'acceptable.

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Section: Discussioncontrasting

confidence: 49%

Metal release and corrosion effects of modular neck total hip arthroplasty

Kretzer

Jakubowitz

Krachler

et al. 2009

International Orthopaedics (SICOT)

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“…There are also no internationally agreed standards for the manufacturing tolerances or surface finishes of such tapers and trunnions. From failures of contemporary THRs, it has been shown that the area of concern is the taper junction of the prostheses (Bishop et al, 2013;Langton et al, 2012;Munir et al, 2015;Shareef and Levine, 1996).…”

Section: Discussionmentioning

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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“…10 It is therefore prudent to prevent bacterial colonisation by having a tight seal at the implant-abutment interface. Three main factors have been identified as possible causes for the formation of microgaps: occlusal load during physiological function, 11 manufacturing tolerance 12 and micromotion between the implant-abutment connection. Different types of abutment connections have been reported to produce different magnitudes of micromotion.…”

Section: Introductionmentioning

confidence: 99%