Fundamental Study on Improvement of Artificial Joint with the Functional Surface structure

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The aim of this study is the long term clinical use of artificial joint by preventing wear dibris of high-density polyethylene (HDP) using "patterning" for frictional surfaces. The effect of frictional surface of the metal (SUS316L,Co-Cr alloy) vs HDP were investigated.From the results of the friction tests with the pin-on-disk experimental system, we found that the introduction of surface patterns enhances lubrication conditions between the metal) and HDP and reduces the creation of wear particles of HDP.The optimum sizes for the diameter and the pitch of the pattern were found. And good lubrication was maintained not in a short time but for a long time during the test.Based on these studies, we experimented the friction tests between the patterned femoral heads and acetabular cups with a hip simulator. In this result, we couldn's find decrease of the coefficient of friction. But the effect of patterning for good lubrication was suggested from the observation of the frictional surfaces with a light microscope. However, if the patterned head had bad condition on surface, lubrication would get worse. Therefore, we have to investigate about the good way of patterning on the surface of head and on the contact area of cup. Moreover we have to improve our simulator, for example the way of loading to friction surface. Then the problem after this are development of the new hip simulator and experiment with it again.