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Relating Bone Intra-Cortical Elastic Stiffness to EDX Spectroscopy Mineralization Measurements

[+] Author Affiliations
Ilige S. Hage, Ré-Mi Hage

Notre Dame University - Louaize, Zouk Mosbeh, Lebanon

Charbel Y. Seif, Ramsey F. Hamade

American University of Beirut, Beirut, Lebanon

Paper No. IMECE2018-86233, pp. V003T04A028; 6 pages
doi:10.1115/IMECE2018-86233
From:
  • ASME 2018 International Mechanical Engineering Congress and Exposition
  • Volume 3: Biomedical and Biotechnology Engineering
  • Pittsburgh, Pennsylvania, USA, November 9–15, 2018
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5202-6
  • Copyright © 2018 by ASME

abstract

It is widely recognized that bone mineral content is a main contributor to cortical bone stiffness. Previous works by the authors revealed that stiffness of mid-diaphysis cortical bone increases with increasing radial position from interior to exterior regions. In this work, we correlate this radial cortical stiffness to the chemical composition of several bone rings cut from 2-year old bovine cow femur (collected fresh from butcher). This mineralization is quantified using energy-dispersive X-ray (EDX) spectroscopy. On each bone ring, five regions are assigned along a 4 mm radial line covering the entire cortical wall thickness. Locations along the radial distance are assigned to acquire the chemical analysis spectrum. Calcium (Ca) and Phosphorus (P) elements chemical elements are traced/detected. Measured mineralization results are expressed as per weight percent concentration (wt %). These elemental results for Calcium (Ca) and Phosphorus (P) are correlated to radial position and stiffness values using statistical analysis (SPSS®). Calcium (Ca) and Phosphorus (P) elements were positively correlated with stiffness values and radius whilst Ca/P ratio was almost constant with the radius. Findings suggest that with increasing radius, Ca (wt%) and P (wt %) showed a fairly increasing trend that correlates to increasing stiffness values proving that increased bone mineralization would contribute to cortical bone stiffness.

Copyright © 2018 by ASME

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