Association between vertebral fractures and brain volume: insights from a community cohort study.

Investigating vertebral fractures and brain structure, we found significant gray matter volume reductions in the right hippocampus, amygdala, and parahippocampal gyrus, especially in males. These findings emphasize the importance of integrating skeletal and neural health in osteoporosis management.

Purpose: Vertebral fractures (VF) due to osteoporosis impact morbidity and quality of life in the elderly. The relationship between VF and changes in brain structure remains underexplored. This study aimed to investigate the association between VF and gray matter volume (GMV) reductions in specific brain regions and to explore potential sex differences.

Methods: Data from 1,751 participants (571 males, 1,180 females; mean age 64.9, range 18-97) in the fourth survey of the population-based Research on Osteoarthritis/Osteoporosis Against Disability study (2015-2016) were used. Participants were classified into those with and without VF (VF + and VF - groups) based on Genant's semiquantitative method, assessed by spine radiographs. Voxel-based morphometry was applied to MRI images to measure GMV, and a general linear model analysis was performed to compare GMV between groups, adjusting for age, sex, total brain volume, and Mini-Mental State Examination scores as covariates. Additionally, a two-way analysis of variance was conducted on the significant GMV cluster, with sex and VF presence as independent variables, to explore interaction effects.

Results: The VF+ group consisted of 113 participants, while the VF- group included 1,638 participants. The analysis identified a significant cluster with reduced GMV in the VF + group compared to the VF - group. This cluster included the right hippocampus, right amygdala, and right parahippocampal gyrus. Further analysis revealed that males in the VF + group exhibited more pronounced GMV reductions in the significant cluster compared to females.

Conclusion: These findings suggest that VF is associated with significant reductions in brain regions critical for memory, emotional processing, and visuospatial memory, with more severe effects observed in males.