Effect of slide track shape on the wear of ultra-high molecular weight polyethylene in a pin-on-disk wear simulation of total hip prosthesis

2004 ◽  
Vol 69B (2) ◽  
pp. 141-148 ◽  
Author(s):  
Vesa Saikko ◽  
Olof Calonius ◽  
Jaakko Keränen
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Hip Prosthesis ◽  
Wear Simulation ◽  
Total Hip Prosthesis ◽  
Total Hip ◽  
Pin On Disk ◽  
Ultra High Molecular Weight

Effect of Lubricant Protein Concentration on the Wear of Ultra-High Molecular Weight Polyethylene Sliding Against a CoCr Counterface

2003 ◽  
Vol 125 (3) ◽  
pp. 638-642 ◽  
Author(s):  
Vesa Saikko
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Protein Concentration ◽  
Calf Serum ◽  
Wear Testing ◽  
Wear Factor ◽  
Prosthetic Joints ◽  
Uhmwpe Wear ◽  
Pin On Disk ◽  
Ultra High Molecular Weight

In the wear testing of prosthetic joints, the optimal lubricant protein concentration is disputed. The effect of protein concentration of calf serum based lubricant on the wear of ultra-high molecular weight polyethylene against CoCr was studied with a 12-station, circularly translating pin-on-disk device. The wear factor first steeply increased with increasing concentration, reached a peak at 10–20 mg/ml, and then slowly decreased. Below 20 mg/ml, the wear mechanisms were not entirely representative of clinical wear. Above this value, the morphology of the UHMWPE wear surface resembled that of retrieved cups. The results indicated that the concentration should not be below 20 mg/ml. The scope of this recommendation is discussed.

The pathogenesis of osteolysis in two different cementless hip replacements

1997 ◽  
Vol 211 (1) ◽  
pp. 59-63 ◽  
Author(s):  
I D Learmonth ◽  
E J Smith ◽  
J L Cunningham
Keyword(s):  
Molecular Weight ◽  
Aseptic Loosening ◽  
High Molecular Weight ◽  
Polyethylene Wear ◽  
Hip Implants ◽  
Total Hip ◽  
Hip Replacements ◽  
The Individual ◽  
Ultra High Molecular Weight

Wear of ultra-high molecular weight polyethylene has been incriminated in the osteolysis associated with aseptic loosening of hip implants. A variety of different factors can contribute to accelerated patterns of polyethylene wear and subsequent osteolysis. This paper examines the incidence of osteolysis observed in two different well-matched cohorts of cementless total hip arthro-plasties. The patterns of osteolysis observed, which are ascribed to the generation of polyethylene debris, are interpreted with reference to the design of the individual prostheses.

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