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B. Sagbas, M.N. Durakbasa:
"Determining frictional behavior of vitamin e blended Uhmwpe";
Talk: IMEKO XX World Congress International Measurement Confederation, Busan, Korea; 09-09-2012 - 09-14-2012; in: "Proceedings of XX IMEKO World Congress International Measurement Confederation", (2012), ISBN: 978-89-950000-5-2; 6 pages.

Abstract: Frictional behaviors of articulating surfaces
have been recognized as critical factors affecting their
service life because these behaviors play very important role
on wear of ultrahigh molecular weight polyethylene
(UHMWPE) which causes failure of artificial joint
replacements. The objective of this study is to determine
temperature rise as a function of sliding time and maximum
load for the articulating surfaces of vitamin E blended
UHMWPE acetabular component paired with a cobaltchromium
(CoCrMo) femoral component. Additionally
frictional torque between the bearing surfaces was measured
and friction coefficient was calculated. Frictional
measurements of the joints were carried out on a custom
made hip joint friction simulator. The prostheses were in 28
mm diameter. Applied static loads were changed from 200
N to 1500 N. In flexion-extension plane, a simple harmonic
oscillatory motion between ±24o was applied to the
UHMWPE acetabular component. The period of motion was
1 Hz and the tests were run up to 11000 cycles. Temperature
rise in acetabular and femoral component is recorded with
embedded thermocouples. Also the tests are repeated with
UHMWPE acetabular component. The results are compared
in terms of UHMWPE and vitamin E blended UHMWPE.

hip joints, friction, frictional heating, temperature measurement