Publisher DOI: 10.1002/jor.22413
Title: The influence of stem design on critical squeaking friction with ceramic bearings
Language: English
Authors: Fan, Na 
Morlock, Michael 
Bishop, Nicholas 
Huber, Gerd 
Hoffmann, Norbert  
Ciavarella, Michele 
Chen, Guang X. 
Hothan, Arne 
Witt, Florian 
Keywords: ceramic bearing;squeaking;stem design;critical friction
Issue Date: 27-Jun-2013
Publisher: Wiley
Source: Journal of Orthopaedic Research 10 (31): 1627-1632 (2013)
Journal or Series Name: Journal of orthopaedic research 
Abstract (english): Ceramic-on-ceramic hip joints have been reported to squeak, a phenomenon that may occur in compromised lubrication conditions. One factor related to the incidence of in vivo squeaking is the stem design. However, it has not yet been possible to relate stem design to squeaking in deteriorating lubrication conditions. The purpose of this study was to determine critical friction factors for different stem designs. A hip simulator was used to measure the friction factor of a ceramic bearing with different stem designs and gradually deteriorating lubrication represented by evaporation of a volatile fluid lubricant. The critical squeaking friction factor was measured at the onset of squeaking for each stem. Critical friction was higher for the long cobalt chrome (0.32 ± 0.02) and short titanium stems (0.39 ± 0.02) in comparison with a long titanium stem (0.29 ± 0.02). The onset of squeaking occurred at a friction factor lower than that measured for dry conditions, in which squeaking is usually investigated experimentally. The results suggest that shorter or heavier stems might limit the possibility of squeaking as lubrication deteriorates. The method developed can be used to investigate the influence of design parameters on squeaking probability. Copyright © 2013 Orthopaedic Research Society.
ISSN: 0736-0266
Institute: Biomechanik M-3 
Mechanik und Meerestechnik M-13 
Type: (wissenschaftlicher) Artikel
Funded by: Chinese Scholarship Council, National Natural Science Foundation of China (No.U1134103 andNo.51275429)
Excellent Doctoral Dissertation Cultivat-ing Program of Southwest Jiaotong University
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