pQCT or QCT devices are optimized for high precision measurements. of physical properties of bone such as bone density and bone geometry. In comparison to the commonly used DXA system which measures bone mass only (BMD). QCT systems can determine bone strength as a mechanical property and the resulting fracture risk. Hence one outcome parameter is the Stress-Strain Index (SSI) comparing bone strength to results of three point bending tests commonly used for mechanical material tests.
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