Document Detail

Human cancellous bone from T12-L1 vertebrae has unique microstructural and trabecular shear stress properties.
MedLine Citation:
PMID:  18848654     Owner:  NLM     Status:  MEDLINE    
Increase of trabecular stress variability with loss of bone mass has been implicated as a mechanism for increased cancellous bone fragility with age and disease. In the current study, a previous observation that trabecular shear stress estimates vary along the human spine such that the cancellous tissue from the thoracic 12 (T12)-lumbar 1 (L1) junction experiences the highest trabecular stresses for a given load was tested as a formal hypothesis using multiple human spines. Thoracic 4, T5, T7, T9, T10, T12, L1, L2, L4 and L5 vertebrae from 10 human cadaver spines were examined. One specimen in the central anterior region was cored in the supero-inferior (SI) direction and another in the postero-lateral region was cored in the transverse (TR) direction from each vertebra. Micro-CT-based large-scale finite element models were constructed for each specimen and compression in the long axis of the cylindrical specimens was simulated. Cancellous bone modulus and the mean, the standard deviation, variability and amplification of trabecular von Mises stresses were computed. Bone volume fraction, trabecular number, trabecular thickness, trabecular separation, connectivity density and degree of anisotropy were calculated using 3D stereology. The results were analyzed using a mixed model in which spine level was modeled using a quadratic polynomial. The maximum of trabecular shear stress amplification and minimum of bone volume fraction were found in the cancellous tissue from the T12-L1 location when results from the samples of the same vertebra were averaged. When groups were separated, microstructure and trabecular stresses varied with spine level, extrema being at the T12-L1 levels, for the TR specimens only. SI/TR ratio of measured parameters also had quadratic relationships with spine level, the extrema being located at T12-L1 levels for most parameters. For microstructural parameters, these ratios approached to a value of one at the T12-L1 level, suggesting that T12-L1 vertebrae have more uniform cancellous tissue properties than other levels. The mean intercept length in the secondary principal direction of trabecular orientation could account for the variation of all mechanical parameters with spine level. Our results support that cancellous tissue from T12-L1 levels is unique and may explain, in part, the higher incidence of vertebral fractures at these levels.
Yener N Yeni; Do-Gyoon Kim; George W Divine; Evan M Johnson; Dianna D Cody
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2008-09-20
Journal Detail:
Title:  Bone     Volume:  44     ISSN:  1873-2763     ISO Abbreviation:  Bone     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-19     Completed Date:  2009-01-28     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  8504048     Medline TA:  Bone     Country:  United States    
Other Details:
Languages:  eng     Pagination:  130-6     Citation Subset:  IM    
Section of Biomechanics, Bone and Joint Center, Henry Ford Hospital, Detroit, MI 48202, USA.
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MeSH Terms
Anatomy, Cross-Sectional
Lumbar Vertebrae / anatomy & histology*,  physiology*
Models, Biological
Stress, Mechanical*
Thoracic Vertebrae / anatomy & histology*,  physiology*
Grant Support
AR049343/AR/NIAMS NIH HHS; P30-CA016672/CA/NCI NIH HHS; R01 AR049343-01/AR/NIAMS NIH HHS; R01 AR049343-02/AR/NIAMS NIH HHS; R01 AR049343-03/AR/NIAMS NIH HHS; R01 AR049343-04/AR/NIAMS NIH HHS

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