Liang Bojian, Kawanabe Keiichi, Ise Kentaro, Iida Hirokazu, Nakamura Takashi
Department of Orthopedic Surgery, Kyoto University, Kyoto, Japan.
J Arthroplasty. 2007 Feb;22(2):251-7. doi: 10.1016/j.arth.2006.03.004.
We compared the polyethylene wear of acetabular sockets articulated with 22.225-mm alumina heads with the polyethylene wear of those articulated with 22.225-mm zirconia heads in cemented total hip arthroplasty during a mean follow-up period of 5.4 years. Using a computer-aided technique, we measured polyethylene wear radiologically in 46 hips with alumina heads and 58 hips with zirconia heads. The preoperative diagnosis in all cases was osteoarthritis. The mean linear wear rate and mean volumetric wear rate of polyethylene sockets against zirconia heads were 0.133 mm/y and 39.8 mm(3)/y, respectively, significantly greater (P < .01) than the wear rates against alumina heads (0.078 mm/y and 24.2 mm(3)/y, respectively). Age at operation, patient body weight as well as height, thickness of polyethylene, and socket abduction angle did not influence the wear rates. We speculate that the excessive polyethylene wear was caused by phase transformation of zirconia, leading to an increase of surface roughness.
我们比较了在平均随访5.4年的骨水泥型全髋关节置换术中，与22.225毫米氧化铝股骨头相匹配的髋臼杯的聚乙烯磨损情况和与22.225毫米氧化锆股骨头相匹配的髋臼杯的聚乙烯磨损情况。我们采用计算机辅助技术，对46例使用氧化铝股骨头的髋关节和58例使用氧化锆股骨头的髋关节进行了聚乙烯磨损的影像学测量。所有病例的术前诊断均为骨关节炎。聚乙烯髋臼杯与氧化锆股骨头匹配时的平均线性磨损率和平均体积磨损率分别为0.133毫米/年和39.8立方毫米/年，显著高于（P <.01）与氧化铝股骨头匹配时的磨损率（分别为0.078毫米/年和24.2立方毫米/年）。手术年龄、患者体重及身高、聚乙烯厚度和髋臼杯外展角度均不影响磨损率。我们推测，聚乙烯过度磨损是由氧化锆的相变导致表面粗糙度增加所致。
