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Friction moments of large metal-on-metal hip joint bearings and other modern designs
Publikationstyp
Journal Article
Date Issued
2008-10-01
Sprache
English
Author(s)
Journal
Volume
30
Issue
8
Start Page
1057
End Page
1064
Citation
Medical Engineering and Physics 30 (8): 1057–1064 (2008)
Publisher DOI
Scopus ID
Publisher
Elsevier
Modern hip joint replacements are designed to minimise wear problems. The most popular metal-on-polyethylene components are being updated by harder metal and ceramic combinations. However, this has also been shown to influence the friction moments, which could overload the interface between the implant and the body. In this study custom test apparatus was used to measure the joint moments in various modern bearings under simulated physiological joint conditions. The largest moments in serum were measured for large diameter metal-metal bearings (<8 Nm for standard bearings), followed by metal-polyethylene, and the lowest moments were for small diameter ceramic-ceramic and ceramic-metal combinations. Water as a lubricant was found to double the moments in comparison with serum. In metal-metal bearings moments were reduced by increasing loading frequency. Swing phase load and a rest period between load cycles had little effect. The moment magnitudes are within the turn-out capacity measured for press-fit cups and might become critical with higher joint loads. © 2008 IPEM.
Subjects
Acetabulum
Bearing
Friction
Hip
Moment
Tribology
DDC Class
610: Medicine, Health
620: Engineering