The stress–strain index (SSI), of a bone, is a surrogate measure of bone strength [1] 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.[ citation needed]
It is calculated using the following formula: [2]
Where:
It was developed by the manufacturer of a peripheral quantitative CT (pQCT) scanner, [2] 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.
The stress–strain index (SSI), of a bone, is a surrogate measure of bone strength [1] 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.[ citation needed]
It is calculated using the following formula: [2]
Where:
It was developed by the manufacturer of a peripheral quantitative CT (pQCT) scanner, [2] 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.