Wear of Highly Cross-linked Polyethylene Acetabular Cup in Japan

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• 作者：Hironobu Oonishi ; Sok Chol Kim ; Yasuhiro Takao ; Masayuki Kyomoto ; Mikio Iwamoto ; Masaru Ueno
• 关键词：total hip arthroplasty ; highly cross-linked polyethylene ; wear ; clinical results ; hip simulator
• 刊名：The Journal of Arthroplasty
• 出版年：2006
• 出版时间：October 2006
• 年：2006
• 卷：21
• 期：7
• 页码：944-949
• 全文大小：351 K

文摘

The wear characteristics of ultra–high-molecular-weight polyethylene acetabular cups irradiated with 6.0 to 7.5 Gy of γ-irradiation were studied in a hip simulator and in vivo in 70 hips for 6 to 39 months. The linear wear was 2.5 % to 4.5 % of the wear seen in conventional polyethylene cups. A biphasic wear pattern was observed over time with a relatively large wear in the first year and a subsequent leveling of the wear rate curve. The linear wear rate in the second phase (steady state) was 0.006 mm/y. The extent of decrease in clinical wear of 6.0-Mrad polyethylene (Aeonian, Kyocera Corp, Kyoto, Japan) cups is comparable with the decrease of the in vitro wear measured by the hip simulation test.