![]() ![]() In addition the upper sections of each process experience higher stress peaks than the lower ones. The processes of the os sacrum are exposed to a higher axial and ventral load due to their location and the lumbosacral flexion. ![]() These results can be explained by the different stress the processes of the different spinal levels are exposed to as well as the specific motion patterns of the facet joint. ![]() The SMI, on the other hand, increased from cranial to caudal displaying more rod-like structures. BV/TV, Tb.N and DA decreased from cranial to caudal while Tb.Th was highest in the most cranial and caudal sections, with the lowest value in the middle. Within the articular process all structure parameters show a similar distribution in L2 and S1. The SMI is lower, and even negative in S1 compared to L2, showing a more plate-like structure. BV/TV, Tb.Th and Tb.N were higher in S1 than in L2. Statistically significant differences were observed between L2 and S1 for the BV/TV, SMI, Tb.Th and Tb.N in superior 2 sections. The following structure parameters were compared between L2 and S1 as well as within each process bone-volume-fraction (BV/TV), trabecular number (Tb.N), trabecular thickness (Tb.Th), structure-model-index (SMI) and degree of anisotropy (DA). Each sample was divided into five sections, each of which containing 20% of the slices. Therefore, the trabecular structure of the superior articular processes of L2 and S1 of 15 cadavers (aged 63–100 years) were studied using μCT (micro-computer tomography). The objective of our study was to investigate whether there is any difference in the adaptation of the cancellous bone in the superior articular process depending on the specific stress condition in different levels of the spine. The role of the facet joint in low back pain has gained public attention lately. ![]()
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