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Implant longevity of hip prosthesis in orthopedics is one of the current topics to support the activities of the elderly. The
present work is focused on the drastic improvement for the wear resistance and reduction of the surface friction of the
acetabular cup as a bearing material in femoral head. In actual orthopedics, cross-linked polyethylene (PE) has been used in
orthopedics as a bearing material in artificial joints. However, wear damages of PE have been one of the factors limiting implant
longevity. That is, the resultant wear of polyethylene bearing purportedly produces billions of wear particles with submicronsize
that cause adverse pathological reaction in the surrounding tissues leading to osteolysis and joint loosening. To avoid the
serious problem, ultra-high molecular weight PE (UHMWPE)/hydroxyapatite (HA) composite was prepared as a substrate
layer by the solution-gel method. As for the second layer, porous UHMWPE/HA composite was prepared by using NaCl as
the porogen and then poly(vinyl alcohol) (PVA) was filled into the pores of UHMWPE/HA composite. The porosity of the
UHMWPE/HA composite was more than 50% and the pore distribution was uniform. A majority of pores were per-foliate and
crammed with PVA gel. PVA/Laponite-HA layer-by-layer (LBL) self-assembly film was prepared as a surface layer, in which
Laponite acted as a template to improve the dispersion of HA in water. The UHMWPE/HA substrate layer and the porous
UHMWPE/HA layer filled with PVA hydrogel were pressed under 180oC, and then they were combined with the surface
layer of LBL film to form a multi-layered composites. The prepared multi-layered composite has a very low friction coefficient
(0.017) under a load of 1200 N, which is similar to the friction coefficient of natural articular cartilage.
Masaru Matsuo has completed his PhD from Kyoto University in Japan and he was a Professor of Nara Women’s University. After his retirement, he became a Full Time Professor of Dalian University of Technology in China. Since September 1st 2014, he is a Visiting Professor of Dalian University of Technology. He has published more than 200 papers in refereed journal articles. He is IUPAC Fellow and has received Paul Flory Polymer Research Prize in April 2010.