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Stress–strain index

Measure of bone strength

Summary

Measure of bone strength

The stress–strain index (SSI), of a bone, is a surrogate measure of bone strength determined from a cross-sectional scan by QCT or pQCT (radiological scan). The stress–strain index is used to compare the structural parameters determined by analysis of QCT/pQCT cross-sectional scans to the results of three-point bending test. TOC

Definition

It is calculated using the following formula:

\text{SSI} = \sum_{i=0}^n }

Where:

  • rmax is the distance of voxel from centre
  • CD is the apparent cortical (bone) density
  • ND is the normal (cortical bone) density
  • r**i is the pixel position from the centre
  • a is the area of a pixel

History and relation to moments of inertia

It was developed by the manufacturer of a peripheral quantitative CT (pQCT) scanner, and is considered to be by some an improvement over the information provided by calculating the area moments of inertia and polar moments of inertia.

References

References

  1. (2005). "Bone geometry and density in the skeleton of pre-pubertal gymnasts and school children.". Bone.
  2. (2001). "Age, sex, and grip strength determine architectural bone parameters assessed by peripheral quantitative computed tomography (pQCT) at the human radius.". J Biomech.
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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