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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 strucural parameters determined by analysis of QCT/pQCT cross-sectional scans to the results of three point bending test.
Additional recommended knowledge
It is calculated using the following formula:
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.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Stress-strain_index". A list of authors is available in Wikipedia.|