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  4. Towards the understanding of hip squeak in total hip arthroplasty using analytical contact models with uncertainty
 
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Towards the understanding of hip squeak in total hip arthroplasty using analytical contact models with uncertainty

Publikationstyp
Conference Paper
Date Issued
2016-08-21
Sprache
English
Author(s)
Oberst, Sebastian  
Zhang, Zhi  
Campbell, Graeme Michael  
Morlock, Michael  
Lai, Joseph C. S.  
Hoffmann, Norbert  orcid-logo
Institut
Biomechanik M-3  
TORE-URI
http://hdl.handle.net/11420/6163
Start Page
5539
End Page
5549
Citation
International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE: 5539-5549 (2016-08-21)
Contribution to Conference
INTER-NOISE, International Congress and Exposition on Noise Control Engineering 2016  
Osteoarthritis in hip joints affects patients' quality of life such that often only costly orthopaedic surgeries i.e. total hip arthroplasty (THA) provide relief. Common implant materials are metal alloys, steel or titanium-based, plastics such as ultra-high molecular weight polyethylene, or biocompatible alumina and composite ceramics. Hard-on-hard (HoH) bearing articulations, i.e. ceramic-on-ceramic, or hard-on-soft combinations are used. HoH implants have been known to suffer from squeaking, a phenomenon commonly encountered in friction-induced self-excited vibrations. However, the frictional contact mechanics, its dynamics related to impingement, the effect of socket position, stem configuration, bearing size and patient characteristics are poorly understood. This study gives an overview of the state of the art biomechanical research related to squeaking in THA, with a focus on the effects of friction, stability, related wear and lubrication. An analytical model is proposed to study the onset of friction-induced vibrations in a simplified hemispherical hip stem rubbing in its bearing by varying the contact area. Preliminary results of the complex eigenvalue analysis and stick-slip motion analysis indicate that an increased contact fosters the development of instabilities, even at very small values of the friction coefficient owing to large local contact pressures.
Subjects
Biomechanics
Contact conditions
Friction
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