Trabecular microfracture and the influence of pyridinium and non-enzymatic glycation-mediated collagen cross-links

The propensity of individual trabeculae to fracture (microfracture) may be important clinically since it could be indicative of bone fragility. Whether or not an overloaded trabecula fractures is determined in part by its structural ductility, a mechanical property that describes how much deformatio...

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Published in:Bone (New York, N.Y.) N.Y.), 2005-12, Vol.37 (6), p.825-832
Main Authors: Hernandez, Christopher J., Tang, Simon Y., Baumbach, Bethany M., Hwu, Paul B., Sakkee, A. Nico, van der Ham, Frits, DeGroot, Jeroen, Bank, Ruud A., Keaveny, Tony M.
Format: Article
Language:English
Subjects:
Age Factors
Aged
Aged, 80 and over
Amino Acids - analysis
Arginine - analogs & derivatives
Arginine - analysis
Biological and medical sciences
Biomechanics. Biorheology
Bone biomechanics
Bone Matrix - chemistry
Cancellous bone
Collagen
Collagen - chemistry
Female
Fractures, Bone - metabolism
Fractures, Bone - pathology
Fundamental and applied biological sciences. Psychology
Glycosylation
Humans
Lysine - analogs & derivatives
Lysine - analysis
Male
Microfracture
Middle Aged
Tensile Strength
Thoracic Vertebrae - chemistry
Tissues, organs and organisms biophysics
Vertebrates: anatomy and physiology, studies on body, several organs or systems
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Summary:The propensity of individual trabeculae to fracture (microfracture) may be important clinically since it could be indicative of bone fragility. Whether or not an overloaded trabecula fractures is determined in part by its structural ductility, a mechanical property that describes how much deformation a trabecula can sustain. The overall goal of this study was to determine the structural ductility of individual trabeculae and the degree to which it is influenced by pyridinium and non-enzymatic collagen cross-links. Vertically oriented rodlike trabeculae were taken from the thoracic vertebral bodies of 32 cadavers (16 male and 16 female, 54–94 years of age). A total of 221 trabeculae (4–9 per donor) were tested to failure in tension using a micro-tensile loading device. A subset of 76 samples was analyzed to determine the concentration of hydroxylysyl–pyridinoline (HP) and lysyl–pyridinoline (LP) cross-links as well as pentosidine, a marker of non-enzymatic glycation. Structural ductility (defined as the ultimate strain of the whole trabecula) ranged from 1.8% to 20.2% strain (8.8 ± 3.7%, mean ± SD) and did not depend on age ( P = 0.39), sex ( P = 0.57), or thickness of the sample at the point of failure ( P = 0.36). Pentosidine was the only marker of collagen cross-linking measured that was found to be correlated with structural ductility ( P = 0.01) and explained about 9% of the observed variance. We conclude that the ductility of individual trabeculae varies tremendously, can be substantial, and is weakly influenced by non-enzymatic glycation.
ISSN:8756-3282
1873-2763
DOI:10.1016/j.bone.2005.07.019