Are DXA/aBMD and QCT/FEA Stiffness and Strength Estimates Sensitive to Sex and Age?

Asghar Rezaei, Hugo Giambini, Timothy Rossman, Kent D. Carlson, Michael J Yaszemski, Lichun Lu, M. (Dan) Dragomir Daescu

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Dual X-ray absorptiometry (DXA) measures areal bone mineral density (aBMD) by simplifying a complex 3D bone structure to a 2D projection and is not equally effective for explaining fracture strength in women and men. Unlike DXA, subject-specific quantitative computed tomography-based finite element analysis (QCT/FEA) estimates fracture strength using 3D bone mineral distribution and geometry. By using experimentally-measured femoral stiffness and strength from a one hundred sample cadaveric cohort that included variations in sex and age, we wanted to determine if QCT/FEA estimates were able to better predict the experimental variations than DXA/aBMD. For each femur, DXA/aBMD was assessed and a QCT/FEA model was developed to estimate femoral stiffness and strength. Then, the femur was mechanically tested to fracture in a sideways fall on the hip position to measure stiffness and strength. DXA/aBMD and QCT/FEA estimates were compared for their sensitivity to sex and age with multivariate statistical analyses. When comparing the measured data with DXA/aBMD predictions, both age and sex were significant (p ≤ 0.0398) for both femoral stiffness and strength. However, QCT/FEA predictions of stiffness and strength showed sex was insignificant (p ≥ 0.23). Age was still significant (p ≤ 0.0072). These results indicate that QCT/FEA, unlike DXA/aBMD, accounted for bone differences due to sex.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalAnnals of Biomedical Engineering
DOIs
StateAccepted/In press - Sep 22 2017

Keywords

  • Aging
  • Bone biomechanics
  • Finite element analysis
  • Hip fracture
  • Sex differences

ASJC Scopus subject areas

  • Biomedical Engineering

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