This study presents the results of indentation tests on the superior vertebral endplate of the 4th lumbar vertebra (L4) of eleven male cadaveric subjects (65 ± 7 years). Three locations on the superior endplate surface were loaded with a 7.9 mm spherical indentor at either a low (1 mm/s) or high (1000 mm/s) rate. Anterior midline and posterior right and left indentation locations were chosen to prevent local deformations and fractures from influencing the results of subsequent and preceding tests. Peak forces were higher in the dynamic tests (498 ± 261 N) than in the quasi-static tests (451 ± 256 N) on the posterior side, although the difference was not significant (p = 0.139). However, the peak forces in the anterior tests (304 ±166 N) were significantly lower (p =0.0157) than in the posterior tests with the same loading rate. The variation in failure forces in the current study correlates with the variation in thickness of endplate cortical bone (between specimens and between anterior and posterior locations on the same specimen) as measured from small field of view computed tomography scans.
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机译：这项研究提出了十一名男性尸体受试者（65±7岁）的第四腰椎（L4）的上椎终板压痕测试的结果。在上端板表面上的三个位置以低速（1 mm / s）或高速（1000 mm / s）加载7.9 mm球形压头。选择前中线以及右和左后方的压痕位置，以防止局部变形和骨折影响后续和先前测试的结果。动态测试（498±261 N）的峰值力高于后侧的准静态测试（451±256 N），尽管差异不显着（p = 0.139）。但是，在相同的加载速率下，前部测试的峰值力（304±166 N）显着低于后部测试（p = 0.0157）。当前研究中的破坏力变化与端板皮质骨厚度的变化（在同一标本之间的标本之间以及前后位置之间）有关，而该变化是通过小视野计算机断层扫描进行测量的。
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