The effect of frictional heating and forced cooling on the serum lubricant and wear of UHMW polyethylene cups against cobalt-chromium and zirconia balls

被引:0
作者
Liao, YS [1 ]
McKellop, H
Lu, Z
Campbell, P
Benya, P
机构
[1] Univ Calif Los Angeles, J Vernon Luck Orthopaed Res Ctr, Orthopaed Hosp, Los Angeles, CA 90024 USA
[2] Univ Calif Los Angeles, Joint Replacement Inst, Orthopaed Hosp, Los Angeles, CA 90024 USA
关键词
hip prostheses; joint simulators; frictional heating; lubrication; cobalt; cobalt-chromium alloy; zirconia; protein precipitation; wear debris;
D O I
10.1016/S0142-9612(03)00148-0
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Hip Simulator tests of femoral balls of cobalt-chromium alloy or zirconia against acetabular cups of UHMW polyethylene were run with and without a coolant circulated inside the femoral balls. Without cooling, the wear of polyethylene against zirconia was about 48% lower than with cobalt-chromium alloy, but the steady-state temperature of the zirconia ball was higher (55degreesC vs. 41degreesC), and there was more precipitation of protein from the serum, which sometimes formed an adherent layer on the surface of the zirconia. Circulating coolant at 1-20degreesC markedly reduced the bearing temperatures and the protein precipitation. With coolant at 4degreesC, wear of the polyethylene against cobalt-chromium alloy was about 26% lower than against zirconia, but the macroscopic and microscopic appearance of the worn polyethylene Surfaces were unlike that typically generated in vivo. With or without coolant, the morphology of the polyethylene wear debris was comparable to that generated in vivo, but the ratio of fibrillar to granular debris was higher at the reduced temperature. These results suggested that circulating coolant at an appropriate temperature Could avoid overheating (due to non-stop running of the simulator), preventing excessive protein precipitation while providing wear surfaces and wear debris with morphologies closely comparable to those generated in vivo. (C) 2003 Elsevier Science Ltd. All rights reserved.
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页码:3047 / 3059
页数:13
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