Kaplan S J, Hayes W C, Stone J L, Beaupré G S
J Biomech. 1985;18(9):723-7. doi: 10.1016/0021-9290(85)90027-2.
Data on the tensile and compressive properties of trabecular bone are needed to define input parameters and failure criteria for modeling total joint replacements. To help resolve differences in reports comparing tensile and compressive properties of trabecular bone, we have developed new methods, based on porous foam technology, for tensile testing of fresh/frozen trabecular bone specimens. Using bovine trabecular bone from an isotropic region from the proximal humerus as a model material, we measured ultimate strengths in tension and compression for two groups of 24 specimens each. The average ultimate strength in tension was 7.6 +/- 2.2 (95% C.I.) MPa and in compression was 12.4 +/- 3.2 MPa. This difference was statistically significant (p = 0.013) and was not related to density differences between the test groups (p = 0.28). Strength was related by a power-law function of the local apparent density, but, even accounting for density influences, isotropic bovine trabecular bone exhibits significantly lower strengths in tension than in compression.
为了定义全关节置换模型的输入参数和失效准则，需要有关松质骨拉伸和压缩特性的数据。为了帮助解决在比较松质骨拉伸和压缩特性的报告中存在的差异，我们基于多孔泡沫技术开发了用于新鲜/冷冻松质骨标本拉伸测试的新方法。使用来自近端肱骨各向同性区域的牛松质骨作为模型材料，我们测量了两组各24个标本的拉伸和压缩极限强度。拉伸平均极限强度为7.6 +/- 2.2（95%置信区间）MPa，压缩平均极限强度为12.4 +/- 3.2 MPa。这种差异具有统计学意义（p = 0.013），并且与测试组之间的密度差异无关（p = 0.28）。强度与局部表观密度呈幂律函数关系，但是，即使考虑密度影响，各向同性牛松质骨的拉伸强度仍明显低于压缩强度。
