Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Stress-Strain Index
Introduction
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 strucural parameters determined by analysis of QCT/pQCT cross-sectional scans to the results of three point bending test.
Definition
Definition
It is calculated using the following formula:[2]
<math>SSI = \sum_{i=0}^n {{r_i^2 a ({{CD} \over {ND}})} \over {r_{max}}}</math>
Where:
- rmax is the distance of voxel from centre
- CD is the apparent cortical (bone) density
- ND is the normal (cortical bone) density
- ri is the pixel position from the centre
- a is the area of a pixel
History and relation to moments of inertia
History and relation to moments of inertia
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.
References
References
- ↑ Ward K, Roberts S, Adams J, Mughal M (2005). “Bone geometry and density in the skeleton of pre-pubertal gymnasts and school children”. Bone. 36 (6): 1012–8. PMID 15876561.
- ↑ 2.0 2.1 Hasegawa Y, Schneider P, Reiners C (2001). “Age, sex, and grip strength determine architectural bone parameters assessed by peripheral quantitative computed tomography (pQCT) at the human radius”. J Biomech. 34 (4): 497–503. PMID 11266673.