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KMID : 0869020050080020137
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Journal of Korean Orthopaedic Research Society
2005 Volume.8 No. 2 p.137 ~ p.143
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Transfer of Metallic Debris from the Metal Surface of an Acetabular Cup to Artificial Femoral Heads by Scraping: Comparison Between Alumina and Cobalt-chrome Heads
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Chang Jong-Bum
Yoo Jeong-Joon
Song Won-Seok
KIm Jong-Won
Koo Kyung-Hoi
Kim Hee-Joong
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Abstract
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Purpose:The purpose of the current in vitro study was to evaluate the transfer of metal to both alumina and cobalt-chrome (Co-Cr) heads that were scraped by a titanium alloy surface under different load conditions.
Matherials and Methods :Alumina and Co-Cr heads were scraped by an acetabular metal shell under various loads using a creep tester. Microstructural changes in the scraped area were visualized with a scanning electron microscope and chemical element changes were assessed using an energy dispersive X-ray spectrometry. Changes in the roughness of the scraped surface were evaluated by a three-dimensional surface profiling system.
Results:Metal transfer to alumina and Co-Cr heads began to be detectable at a 10~15 kg load, which could be exerted by one-handed force. At loads of 30, 50 kg, fissures occurred on the head surfaces in addition to metal transfer.
Conclusion:This study reveals that metallic debris was transferred from the titanium alloy acetabular shell to both alumina and Co-Cr heads by minor scraping. When the contact force increased, scratching of the head surface occurred in addition to the transfer of metal. The results of this study suggest that the greatest possible effort should be made to protect femoral heads, regardless of material, from contact with metallic surfaces during total hip arthroplasty.
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KEYWORD
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Total hip arthroplasty, Scraping, Alumina head, Co-Cr head, Metal transfer
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