A multi-directional wear screening device and preliminary results of UHMWPE articulating against stainless steel.
This paper describes the design of a pin on plate rig which has been modified to give multi-directional motion to the test pins, resulting in elliptical and quasi-elliptical wear paths. Such paths are closer to those seen in vivo by a femoral head articulating against an acetabular cup. The description of the rig is augmented by the results of a test of ultra high molecular weight polyethylene pins rubbing against stainless steel plates. with dilute bovine serum at 37 degrees C being used as the lubricant. With standard reciprocating motion, a mean wear factor of 0.085 x 10(-6) mm3/N m was found, but with multi-directional motion, the mean wear factor increased to 1.10 x 10(-6) mm3/N m, which is very similar to in vivo wear factors.
Joyce
T J
TJ
Centre for Biomedical Engineering, University of Durham, UK. t.j.joyce@durham.ac.uk
Monk
D
D
Scholes
S C
SC
Unsworth
A
A
D000818:Animals; D002417:Cattle; D019544:Equipment Failure Analysis; D006622:Hip Prosthesis; D008422:Materials Testing; D009038:Motion; D011095:Polyethylenes; D013193:Stainless Steel; D013499:Surface Properties
D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D013193:Stainless Steel