Osteoporosis and Hip Fracture Risk From Routine Computed Tomography Scans: The Fracture, Osteoporosis, and CT...

Area of Science:

• Orthopedics
• Radiology
• Gerontology

Background:

• Hip fracture is a major cause of morbidity and mortality in older adults.
• Accurate risk assessment is crucial for preventative strategies.
• Dual-energy X-ray absorptiometry (DXA) is a common tool for assessing bone mineral density (BMD).

Purpose of the Study:

• To evaluate the efficacy of biomechanical CT (BCT) in identifying patients at high risk of incident hip fracture.
• To compare the predictive performance of BCT with traditional DXA measurements.

Main Methods:

• A case-cohort study was conducted using data from 111,694 individuals aged 65+ with prior CT scans.
• CT scans were analyzed using BCT to derive DXA-equivalent hip BMD and finite element analysis-based femoral strength.
• Hip fracture cases (n=1959) were compared to randomly selected controls (n=1979).

Main Results:

• BCT-derived femoral strength was a significant predictor of hip fracture risk in both men and women, independent of BMD.
• The hip BMD T-score derived from BCT showed similar predictive performance to DXA.
• BCT analysis demonstrated higher sensitivity for hip fracture prediction compared to DXA, with comparable specificity.

Conclusions:

• Biomechanical CT analysis of previously acquired CT scans is a viable and effective tool for assessing hip fracture risk.
• BCT offers at least equivalent, and potentially superior, performance to DXA in identifying individuals at high risk of hip fracture.
• This approach can leverage existing imaging data, potentially improving fracture risk assessment in clinical settings.