Choi K, Goldstein S A
University of Michigan, Department of Surgery, Ann Arbor.
J Biomech. 1992 Dec;25(12):1371-81. doi: 10.1016/0021-9290(92)90051-2.
The fatigue properties of trabecular bone tissue (single trabeculae) and similarly sized cortical bone specimens from human tibia were experimentally determined on a microstructural level using four-point bending cyclic tests, and they were compared based on modulus, mineral density, and microstructural characteristics. The results showed that trabecular specimens had significantly lower moduli and lower fatigue strength than cortical specimens, despite their higher mineral density values. Fracture surface and microdamage analyses illustrated different fracture and damage patterns between trabecular and cortical bone tissue, depending upon their microstructural characteristics. Based on the results from mechanical tests and qualitative observations, a possible mechanical role of the cement lines in trabecular tissue microfracture was suggested.
利用四点弯曲循环试验，在微观结构水平上通过实验测定了人胫骨小梁骨组织（单个小梁）和尺寸相似的皮质骨标本的疲劳特性，并基于模量、矿物质密度和微观结构特征对它们进行了比较。结果表明，尽管小梁标本的矿物质密度值较高，但其模量和疲劳强度明显低于皮质标本。断口表面和微损伤分析表明，小梁骨组织和皮质骨组织之间的断裂和损伤模式不同，这取决于它们的微观结构特征。基于力学试验结果和定性观察，提出了黏合线在小梁组织微骨折中可能的力学作用。
