A multi-station hip joint simulator study of the performance of 22 mm diameter zirconia-ultra-high molecular weight polyethylene total replacement hip joints

1999 ◽  
Vol 213 (2) ◽  
pp. 77-90 ◽  
Author(s):  
A A J Goldsmith ◽  
D Dowson
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Hip Joint ◽  
Hip Joints ◽  
Total Replacement ◽  
Simulator Study ◽  
Ultra High Molecular Weight ◽  
Hip Joint Simulator

Comparison of wear of ultra-high molecular weight polyethylene acetabular cups against surface-engineered femoral heads

2008 ◽  
Vol 222 (7) ◽  
pp. 1073-1080 ◽  
Author(s):  
A Galvin ◽  
C Brockett ◽  
S Williams ◽  
P Hatto ◽  
A Burton ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Hip Joint ◽  
Vapour Deposition ◽  
Polyethylene Wear ◽  
Chemical Vapour ◽  
Alumina Ceramic ◽  
Femoral Heads ◽  
Ultra High Molecular Weight ◽  
Hip Joint Simulator

Alumina ceramic heads have been previously shown to reduce polyethylene wear in comparison to cobalt chrome (CoCr) heads in artificial hip joints. However, there are concerns about the brittle nature of ceramics. It is therefore of interest to investigate ceramic-like coatings on metallic heads. The aim of this study was to compare the friction and wear of ultra-high molecular weight polyethylene (UHMWPE) against alumina ceramic, CoCr, and surface-engineered ceramic-like coatings in a friction simulator and a hip joint simulator. All femoral heads tested were 28 mm diameter and included: Biolox™ Forte alumina, CoCr, arc evaporative physical vapour deposition (AEPVD) chromium nitride (CrN) coated CoCr, plasma-assisted chemical vapour deposition (PACVD) amorphous diamond-like carbon (aDLC) coated CoCr, sputter CrN coated CoCr, reactive gas controlled arc (RGCA) AEPVD titanium nitride (TiN) coated CoCr, and Graphit-iC™ coated CoCr. These were articulated against UHMWPE acetabular cups in a friction simulator and a hip joint simulator. Alumina and CoCr gave the lowest wear volumes whereas the sputter coated CrN gave the highest. Alumina also had the lowest friction factor. There was an association between surface parameters and wear. This study indicates that surface topography of surface-engineered femoral heads is more important than friction and wettability in controlling UHMWPE wear.

Wear of ultra-high molecular weight polyethylene acetabular cups in a physiological hip joint simulator in the anatomical position using bovine serum as a lubricant

1997 ◽  
Vol 211 (3) ◽  
pp. 265-269 ◽  
Author(s):  
R J A Bigsby ◽  
C S Hardaker ◽  
J Fisher
Keyword(s):  
Molecular Weight ◽  
Stainless Steel ◽  
High Molecular Weight ◽  
Hip Joint ◽  
Bovine Serum ◽  
Clinical Results ◽  
Zirconia Ceramic ◽  
Wear Rates ◽  
Ultra High Molecular Weight ◽  
Hip Joint Simulator

The Leeds physiological anatomical (PA) hip joint simulator was developed to apply three axes of loading and a complex three-dimensional motion so that the forces and motions can reproduce exactly the walking cycles defined by Paul. This paper presents the results of a study using the Leeds PA hip joint simulator to determine the wear of 32 mm ultra-high molecular weight polyethylene (UHMWPE) acetabular cups against stainless steel and zirconia ceramic heads, using bovine serum as lubricant. These results have been compared with the results of a previous study that used water as the lubricant, which led to UHMWPE transfer film being formed on the stainless steel head. Comparisons are also made with clinical results and results from other simulators. The study indicates that it is preferable to use bovine serum in simulator studies. In addition, the results indicate that if the surface roughness of the metallic and femoral heads are similar, and they remain undamaged during the tests, the wear rates of the UHMWPE cups are likely to be similar.

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