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A z score (or standardized value) is measured in units of the standard deviation. It tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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A z score (or standardized value) is measured in units of the standard deviation. It indicates how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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Outer-Boundary Assisted Segmentation and Quantification of Trabecular Bones by an Imagej Plugin
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Dual-energy X-ray Absorptiometry Monitoring with Trabecular Bone Score: 2019 ISCD Official Position.

Kelly Krohn1, Elliott N Schwartz2, Yoon-Sok Chung3

  • 1Department of Orthopedic Surgery, University of Arizona College of Medicine Phoenix, AZ, USA.

Journal of Clinical Densitometry : the Official Journal of the International Society for Clinical Densitometry
|August 7, 2019
PubMed
Summary
This summary is machine-generated.

Trabecular bone score (TBS) assesses bone quality and fracture risk, complementing bone mineral density (BMD) measurements. While not ideal for monitoring bisphosphonates, TBS may help track anabolic therapies like teriparatide.

Keywords:
DXAOsteoporosisTBSfracturemonitortreatment

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Area of Science:

  • Osteoporosis research
  • Bone microarchitecture analysis
  • Fracture risk assessment

Background:

  • Trabecular bone score (TBS) is a textural index analyzing lumbar spine images via dual-energy X-ray absorptiometry (DXA).
  • It indirectly assesses trabecular microarchitecture, serving as an independent predictor of fracture risk.
  • The clinical utility of TBS in monitoring osteoporosis treatments is under investigation.

Purpose of the Study:

  • To evaluate the role of TBS in monitoring skeletal effects of osteoporosis therapies.
  • To determine if TBS changes reflect meaningful improvements or worsening of bone quality.
  • To compare the complementary roles of TBS and bone mineral density (BMD) in fracture risk assessment.

Main Methods:

  • Analysis of pixel gray-level variations in lumbar spine DXA images.
  • Review of evidence presented at the 2019 ISCD Position Development Conference.
  • Calculation of least significant change (LSC) for TBS, estimated at 5.8% or facility-specific.

Main Results:

  • TBS is not clinically useful for monitoring bisphosphonates or denosumab.
  • TBS shows potential utility in monitoring anabolic agents like teriparatide and abaloparatide.
  • A significant TBS increase may indicate improved bone structure; a decrease may signal worsening.

Conclusions:

  • TBS and BMD measure different aspects of bone health (quality vs. quantity).
  • TBS may be a valuable tool for monitoring anabolic therapy response.
  • Further clinical assessment and treatment strategy adjustments may be warranted based on TBS changes.