Todo S, Tomita N, Kitakura T, Yamano Y
Department of Orthopaedic Surgery, Osaka City University Medical School, Japan.
Biomed Mater Eng. 1999;9(1):13-20.
The objective of this study was to evaluate the effect of sliding locus on fatigue destruction of ultra-high-molecular-weight polyethylene (UHMWPE) in order to design a durable total knee arthroplasty (TKA) articulation. Two-dimensional sliding fatigue testing was performed under two simplified patterns of articulating interface sliding locus. Scanning acoustic tomography (SAT) was used for observation of subsurface cracks in UHMWPE specimens. A high rate of subsurface crack formation was observed when the movement was reciprocated on two different loci, in contrast with that on a single linear locus. This finding suggests that crack formation or propagation in UHMWPE components is accelerated not only by the compressive stress but also by complicated articulating movement locus.
本研究的目的是评估滑动轨迹对超高分子量聚乙烯（UHMWPE）疲劳破坏的影响，以便设计出耐用的全膝关节置换术（TKA）关节。在两种简化的关节界面滑动轨迹模式下进行二维滑动疲劳测试。使用扫描声层析成像（SAT）观察UHMWPE标本中的亚表面裂纹。与在单个线性轨迹上的运动相比，当在两个不同轨迹上进行往复运动时，观察到较高的亚表面裂纹形成率。这一发现表明，UHMWPE部件中的裂纹形成或扩展不仅受到压缩应力的加速，还受到复杂的关节运动轨迹的加速。
