Affatato S, Leardini W, Jedenmalm A, Ruggeri O, Toni A
Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italy.
Clin Orthop Relat Res. 2007 Mar;456:153-8. doi: 10.1097/01.blo.0000246561.73338.68.
Metal-on-metal hip arthroplasty has the longest clinical history of all total arthroplasties. We asked whether large diameter femoral heads would result in less wear than those with small diameters. We also asked if there is a threshold diameter that ensures good wear behavior. We tested three batches of cast high-carbon cobalt-chromium-molybdenum hip implants (28 mm, 36 mm, and 54 mm diameters) in a hip simulator for 5 million cycles. We used bovine serum as lubricant and weighed the samples at regular intervals during testing. The 28-mm configuration had almost twice the wear of the 54-mm configuration, but we observed no difference between the 36-mm and the 54-mm configurations. The similarity in the wear performances of the larger configurations supports the presence of a threshold diameter that ensures good wear behavior.
金属对金属髋关节置换术在所有全关节置换术中拥有最长的临床应用历史。我们探究了大直径股骨头是否比小直径股骨头产生更少的磨损。我们还研究了是否存在一个能确保良好磨损性能的临界直径。我们在髋关节模拟器中对三批铸造的高碳钴铬钼髋关节植入物（直径分别为28毫米、36毫米和54毫米）进行了500万次循环测试。我们使用牛血清作为润滑剂，并在测试过程中定期对样本称重。28毫米规格的磨损几乎是54毫米规格的两倍，但我们观察到36毫米和54毫米规格之间没有差异。较大规格磨损性能的相似性支持了存在一个能确保良好磨损性能的临界直径这一观点。
