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Dual-energy X-ray Absorptiometry.

Rajesh K Jain1, Tamara Vokes2

  • 1Department of Medicine, Section of Endocrinology, Diabetes, and Metabolism, University of Chicago, 5841 S Maryland Ave, Chicago, IL 60637; Department of Medicine, Section of Diabetes, Metabolism, and Endocrinology, Temple University Hospital, 3401 N Broad St, Philadelphia, PA 19140.

Journal of Clinical Densitometry : the Official Journal of the International Society for Clinical Densitometry
|July 19, 2017
PubMed
Summary

Dual-energy X-ray absorptiometry (DXA) is a key tool for assessing bone mineral density (BMD) and fracture risk. While valuable, DXA has limitations, and its interpretation requires careful consideration of patient-specific factors.

Keywords:
DXAethnicityfractureosteoporosis

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Area of Science:

  • Orthopedics
  • Radiology
  • Gerontology

Background:

  • Dual-energy X-ray absorptiometry (DXA) is the standard for measuring bone mineral density (BMD) to assess fracture risk.
  • The World Health Organization's 1994 definition of osteoporosis relies on DXA-derived T-scores, establishing its central role in diagnosis.
  • Numerous studies confirm that lower BMD, as measured by DXA, significantly increases the relative risk of fracture.

Purpose of the Study:

  • To review the role of DXA in fracture risk assessment.
  • To discuss the strengths and limitations of DXA in clinical practice.
  • To highlight considerations for specific populations and potential sources of error in DXA measurements.

Main Methods:

  • Review of existing literature on DXA and fracture risk.
  • Analysis of the predictive value of BMD measurements.
  • Discussion of DXA's limitations and strengths.

Main Results:

  • DXA-measured BMD is a strong predictor of fracture risk, with each standard deviation decrease associated with a 1.5-2.5 relative risk increase.
  • Significant overlap exists in BMD values between patients who fracture and those who do not.
  • Factors such as bone size, ethnic variations, positioning errors, and artifacts (e.g., osteoarthritis) can affect DXA accuracy.

Conclusions:

  • DXA is a cornerstone of fracture risk assessment due to its wide availability, low radiation dose, and extensive supporting evidence.
  • Despite limitations, DXA remains essential for osteoporosis diagnosis and management.
  • Further research may be needed to refine DXA interpretation in diverse populations and mitigate sources of error.