Lower spinal bone density is associated with faster global cognitive decline and accelerated microstructural brain injury over a five-year period, according to a longitudinal analysis published September 22, 2026, in the journal Radiology. Researchers at Johns Hopkins University utilized artificial intelligence to evaluate clinical imaging data from over 700 older adults, discovering that skeletal deterioration in the spine frequently parallels neurological degeneration.
AI-Driven Imaging Reveals Bone-Brain Links
The research team analyzed data from the Multi-Ethnic Study of Atherosclerosis (MESA). Using a deep learning algorithm, the investigators measured thoracic vertebral volumetric bone mineral density (vBMD) from noncontrast chest CT scans across a group of 2086 individuals, ultimately drawing a final cohort of 715 participants with complete baseline vBMD measurements, brain MRI scans, and longitudinal cognitive testing.
Participants had a median age of 69 years, and 55.5% were men. Individuals with a prior history of dementia or stroke at baseline were excluded from the study. Over a follow-up period of approximately five years, the data showed that each 0.1-g/cm³ decrease in thoracic vBMD was linked to an additional 0.025-standard-deviation decline in a global cognitive composite score per year, or about 0.15 standard deviations over five years, even after controlling for physical activity, cardiovascular risk factors, age, sex, and race or ethnicity.
Did you know? Routine chest CT scans—often performed for lung cancer screening or cardiac calcium scoring—contain thoracic spine imaging that AI can evaluate opportunistically for bone density without ordering extra scans.
Regional White Matter Vulnerability and Microstructural Decay
Beyond global cognitive scores, the study tracked specific structural changes within the brain. Longitudinal white matter hyperintensity (WMH) data were available for 408 participants, while fractional anisotropy (FA) data measuring white matter tract integrity were available for 405 participants.
Researchers observed that lower baseline vBMD was associated with a 12.8% faster annual accumulation of WMHs in the corpus callosum, a region critical for executive functioning, working memory, and attention. Participants with lower spinal bone density exhibited greater microstructural decay—measured as a 0.048-standard-deviation greater annual decline in fractional anisotropy—in the anterior limb of the internal capsule, which also supports executive function.
“This comprehensive study using both imaging and clinical assessments sends a clear signal that bone density at baseline is associated with both functional and imaging measures of age-related brain degeneration,” said Dr. Demehri, professor of radiology at Johns Hopkins University in Baltimore.
Shared Metabolic Drivers and Diabetes Subgroups
While the findings establish a clear co-occurrence of skeletal and neurological decline, the investigators emphasized that low bone density does not directly cause dementia. Instead, vertebral bone mineral density likely acts as an integrative marker of cumulative systemic health.
“This study is not about cause and effect, but rather the observation of a metabolic syndrome that may cause both bone and brain degeneration,” Dr. Demehri stated, adding that parallel aging mechanisms such as insulin resistance, dyslipidemia, and menopausal changes may drive both conditions simultaneously.
A post hoc analysis revealed that the association between lower vBMD and faster WMH accumulation appeared specifically among participants with diabetes, showing a 4.99% faster annual rate of WMH growth in that subgroup. The research team cautioned that this subgroup finding requires replication and noted that current CT-derived vBMD methods must be validated across different scanners and clinical protocols before routine clinical use.
Frequently Asked Questions
Does low bone density cause cognitive decline?
Rather, lower spinal bone density serves as an observable marker reflecting shared systemic factors—such as metabolic dysfunction and lifelong inflammation—that affect both bone and brain health over time.
How was the bone density measured in this study?
Investigators used a specialized deep learning algorithm to extract thoracic vertebral volumetric bone mineral density (vBMD) directly from noncontrast chest CT scans that participants had already undergone.
Which brain regions showed the most vulnerability?
Participants with lower spinal bone density experienced faster accumulation of white matter hyperintensities in the corpus callosum and greater loss of white matter integrity in the anterior limb of the internal capsule.
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