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先进的测试协议模拟故障,并验证脚植入物中的抗氧化聚乙烯.

Ryan Siskey1,2, Patrick Hall1, Ruth Heckler3

  • 1Exponent Inc., Philadelphia, Pennsylvania, USA.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society
|May 19, 2025
PubMed
概括

氧化导致全脚置换 (TAR) 中聚乙烯疲劳失败,特别是在 varus-valgus 旋转时. 抗氧化剂稳定显著提高UHMWPE的耐用性,提高TAR性能和植入物的寿命.

关键词:
氧化和抗氧化作用和抗氧化作用.聚乙烯的抗疲劳性 耐疲劳性整体关节置换 (TAR) 已经完成.瓦鲁斯-瓦尔古斯旋转的旋转维生素E稳定聚乙烯的维生素E.

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科学领域:

  • 生物材料工程 生物材料工程
  • 整形外科手术 整形外科手术
  • 机械工程 机械工程

背景情况:

  • 完全关节置换 (TAR) 是对末期关节骨关节炎的治疗方法.
  • 聚乙烯 (PE) 疲劳是影响TAR生存的一个关键因素.
  • 携带移动轴承的TAR设计容易发生特定的故障模式.

研究的目的:

  • 建立一个临床相关的测试协议,模拟移动轴承TAR中的PE疲劳.
  • 评估氧化和抗氧化剂稳定对UHMWPE性能的影响.
  • 为了评估传统与维生素E稳定型UHMWPE的耐疲劳性.

主要方法:

  • 开发了一个六度自由度模拟器来复制临床PE疲劳失败.
  • 在体温下应用了旋旋转和循环负荷 (1500-3000N).
  • 经过测试的常规和维生素E稳定型UHMWPE插件到骨折或300万次循环.
  • 使用福里埃变换红外光谱法 (ASTM F2102) 测量氧化水平.

主要成果:

  • 传统的UHMWPE由于在瓦鲁斯-瓦尔古斯旋转下疲劳而失败 (OI = 2.59 ± 1.11).
  • 在没有瓦鲁斯-瓦尔古斯旋转的情况下,在传统的UHMWPE中没有发生疲劳故障.
  • 维生素E稳定的UHMWPE在300万次循环后没有表现出疲劳失败,即使在旋转 (OI = 0.23 ± 0.02).
  • 断层学表明,裂在低谷开始,并在循环负荷下传播.

结论:

  • 氧化显著减少UHMWPE疲劳寿命在移动轴承TAR.
  • 瓦鲁斯-瓦尔古斯旋转加剧了TAR植入物中PE疲劳失败.
  • 抗氧化剂稳定 (维生素E) 显示出对疲劳和氧化的优越抵抗力.
  • 开发的协议可以评估替代生物材料的安全性和性能.