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  4. Factors influencing taper failure of modular revision hip stems
 
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Factors influencing taper failure of modular revision hip stems

Citation Link: https://doi.org/10.15480/882.1886
Publikationstyp
Journal Article
Date Issued
2018-03-02
Sprache
English
Author(s)
Krull, Annika  
Morlock, Michael  
Bishop, Nicholas  
Institut
Biomechanik M-3  
TORE-DOI
10.15480/882.1886
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1889
Journal
Medical engineering & physics  
Volume
54
Start Page
65
End Page
73
Citation
Medical engineering & physics (54): 65-73 (2018-04)
Publisher DOI
10.1016/j.medengphy.2018.02.001
Scopus ID
2-s2.0-85042539574
Publisher
Elsevier
Stem modularity of revision hip implant systems offers the advantage of the restoration of individual patient geometry but introduces additional interfaces, which are subjected to repetitive bending loading and have a propensity for fretting corrosion. The male stem taper is the weakest part of the modular junction due to its reduced cross section compared to the outside diameter of the stem. Taper fractures can be the consequence of overloading in combination with corrosion. The purpose of this study was to assess the influence of implant design factors, patient factors, and surgical factors on the risk of taper failure of the modular junction of revision stems. An analytical bending model was used to estimate the strength of the taper connection for pristine, fatigued and corroded conditions. Additionally, a finite element contact model of the taper connection was developed to assess the relative motion and potential for surface damage at the taper interface under physiological loading for varyied assembly and design parameters. Increasing the male taper diameter was shown to be the most effective means for increasing taper strength but would require a concurrent increase in the outer implant diameter to limit a greater risk of total surface damage for a thinner female taper wall. Increasing the assembly force decreases the total surface damage but not local magnitudes, which are probably responsible for crack initiation. It is suggested that in unfavourable loading conditions a monobloc implant system will reduce the risk of failure.
Subjects
Corrosion
Fatigue
Finite element model
Fracture
Hip revision
Strength
Surface damage
Taper junction
Titanium
DDC Class
610: Medizin
Publication version
acceptedVersion
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
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