Iliescu Dan Marcel, Micu Sergiu-Ioan, Ionescu Costin, Bulbuc Ionut, Bordei Petru, Obada Bogdan, Voinea Felix, Gheorghe Emma, Iliescu Madalina Gabriela
Department of Anatomy and Histology, Faculty of Medicine, 'Ovidius' University of Constanta, 900527 Constanta, Romania.
Department of Gastroenterology, Clinical County Hospital of Constanta, 900591 Constanta, Romania.
Exp Ther Med. 2021 Oct;22(4):1192. doi: 10.3892/etm.2021.10626. Epub 2021 Aug 17.
The aim of the present study conducted on the lumbar spine was to confirm that the pronounced decrease in resistance in the system is a phenomenon that can be eminently affected by the adaptive changes that occur at the level of the intervertebral disc at axial mechanical stresses. The biomechanical trial was carried out on 11 lumbar segments L1-L5, gathered from adult human cadavers. The dissection considered the complete keeping of all bone, disc, articulated and ligamentous components in their anatomical position. All 11 samples were frozen 24 h prior to the performance of the biomechanical measurement. The specimens were placed in the testing device, their placement being conditioned by the estimated dimensional values. Thus, to calculate the load and axial resistance, the models were placed vertically, central between the test machine ferries. The testing was carried out by applying variable forces and displacement supervision. The displacement interval was represented by a segment of 0-10 mm with surveillance every 2 mm. Mobility in the sagittal plane (flexion earlier in our case) was much higher than that in the frontal plane, obviously limiting mobility via the intervertebral disc and articular complex through the presence of arches. Statistical analysis demonstrated the lack of any correlation values between the two types of movements (R=0.005507), underlining the absence of any prediction elements. A noteworthy aspect is that the correlations appeared low, statistically insignificant, even within the same movement in the sagittal plane between the two levels, L1-L3 and L3-L5 (R=0.610427), which may lead to the possibility of the emergence of significant differences in mobility between respective levels. The behavior type of the monitored specimens and the results obtained allowed the mapping of objective parallelism between the values obtained and the behavior of the lumbar vertebral segment.
本项针对腰椎开展的研究旨在确认，系统中阻力的显著降低是一种可受轴向机械应力作用下椎间盘层面发生的适应性变化显著影响的现象。对取自成年人体尸体的11个L1 - L5腰椎节段进行了生物力学试验。解剖过程中，所有骨骼、椎间盘、关节和韧带成分均保持在其解剖位置。在进行生物力学测量前24小时，将所有11个样本冷冻。将标本放置在测试装置中，其放置取决于估计的尺寸值。因此，为了计算负荷和轴向阻力，将模型垂直放置在试验机托架之间的中心位置。通过施加可变力并进行位移监测来进行测试。位移区间为0 - 10毫米，每2毫米进行一次监测。矢状面（在我们的案例中为前屈）的活动度远高于额状面，显然，由于存在椎弓，椎间盘和关节复合体限制了活动度。统计分析表明，两种运动类型之间不存在任何相关值（R = 0.005507），这突出表明不存在任何预测因素。一个值得注意的方面是，即使在矢状面内同一运动的L1 - L3和L3 - L5两个水平之间，相关性也很低，在统计学上不显著（R = 0.610427），这可能导致各水平之间活动度出现显著差异的可能性。所监测标本的行为类型以及获得的结果使得能够描绘出所获数值与腰椎节段行为之间的客观平行关系。
