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Related Experiment Videos

DXA-derived section modulus and bone mineral content predict long-bone torsional strength.

V K Sarin1, E G Loboa Polefka, G S Beaupré

  • 1Rehabilitation Research & Development Center, VA Palo Alto Health Care System, CA 94304, USA. sarin@bones.stanford.edu

Acta Orthopaedica Scandinavica
|April 7, 1999
PubMed
Summary

Dual energy x-ray absorptiometry (DXA) scans can predict bone strength using section modulus (Z). However, bone mineral content (BMCL) showed similar predictive accuracy for bone strength in this study.

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Medical Imaging

Background:

  • Dual energy x-ray absorptiometry (DXA) is used to estimate bone strength via section modulus (Z).
  • Previous research assumed DXA-derived Z values correlate with bone strength in bending and torsion.

Purpose of the Study:

  • To assess the validity of DXA-derived section modulus (Z) as an indicator of bone strength.
  • To compare the predictive power of Z and bone mineral content (BMCL) for torsional bone strength.

Main Methods:

  • DXA scans were performed on dog, pig, and human femurs (n=22).
  • Ex vivo torsional strength tests and torsional finite element models were utilized.
  • Section modulus (Z) and bone mineral content (BMCL) were calculated from DXA scans.

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Main Results:

  • A strong correlation was found between BMCL and torsional strength (r² = 0.87).
  • A strong correlation was also observed between DXA-derived Z and torsional strength (r² = 0.86).
  • Adjusting Z values for cross-sectional shape and bone tissue properties did not improve the correlation with strength.

Conclusions:

  • DXA-derived section modulus (Z) can predict bone strength across a wide range of bone sizes.
  • No significant advantage of using DXA-derived Z over BMCL was found for predicting bone strength.