Study design Experimental and computational assessment of thickness, porosity, biomechanical behavior, and adjacent disc glycosaminoclycan (GAG) content in double-layer and single-layer bony endplate samples harvested from human cadaver spines. Objective Determine if the second layer of bone in double-layer vertebral endplates allows the superficial layer to achieve a more optimal balance between its biomechanical and nutritional functions. Summary of background data Proper disc health requires the endplate to balance opposing biomechanical and nutritional functions. Previous studies investigating endplate function report the occurrence of double-layer endplates, but it remains unclear whether the second layer of bone has any functional advantage. Such information could shed light on the factors that protect against disc degeneration. Methods Six lumbar spines were obtained from human cadavers (32–84 years) and scanned with magnetic resonance imaging. Cylindrical cores that included the endplate and underlying trabecular bone were harvested from the center of the superior vertebral endplates (six double-layer endplates and twelve single-layer endplates) and imaged using micro-CT. The thickness and porosity of the bony endplate layers was measured for each core. High-resolution finite element analysis was performed to assess biomechanical behavior. GAG content within the adjacent nucleus tissue was quantified using the dimethylmethylene blue technique. Results The superficial layer of the double-layer endplates was 50% thinner (p = 0.009) and tended also to be more porous than single-layer endplates. Strains were higher in thinner endplates; however, the second layer of bone in the double-layer endplates had a stiffening effect so that despite being thinner than single-layer endplates, the superficial layer of the double-layer endplates had a similar risk of damage. After adjusting for age, GAG content was significantly higher in the nucleus tissue adjacent to the double-layer endplates (p = 0.01). Conclusion Compared to single-layer endplates, double-layer endplates appear to permit a more optimal balance between endplate biomechanical and nutritional function and may therefore offer a significant protective factor against disc degeneration.
Spinal metastatic disease could lead to catastrophic consequences for the patient. However, the structural parameters that explain the weakening of vertebrae affected by tumours are not fully understood. In this study, we developed a specimen-specific finite element model to predict the strength of the porcine vertebra with simulated tumours and used it to find the structural parameters determining the strength. We validated our model with mechanical testing and then we analysed the compressive strength of intact vertebrae and seven defects with different size and shape. The results showed that the minimum bone mineral mass of the cross section and areal defect fraction were the best predictors of the normalized strength. We also found that areal parameters appeared to be better predictors than the volumetric ones. In conclusion, reduction in bone strength for vertebrae weakened by metastatic tumours is mostly associated with decrease in the mechanical properties of the cross section.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.