Bone Microstructure and Reduced Bone Size in Elderly Men with Type 2 Diabetes
Overview
Older men with type 2 diabetes mellitus (T2DM) exhibit a smaller cross-sectional bone area and reduced bone strength at the tibia compared to nondiabetic men. Cortical porosity and trabecular microarchitecture do not differ significantly by diabetes status, but longer disease duration and insulin use are linked to cortical deterioration.
Background
Type 2 diabetes is an independent risk factor for fragility fractures, with a 27% increased risk of hip fractures reported. Despite normal or higher bone mineral density (BMD), fracture risk is elevated in T2DM, suggesting compromised bone quality. Previous studies using HR-pQCT have shown increased cortical porosity in diabetic patients, mainly women, but data in older men remain limited. The MrOS cohort study provides the largest analysis of bone microarchitecture in elderly men with T2DM.
Data Highlights
Parameter
Site
Difference in T2DM vs Non-T2DM (%)
Total Cross-Sectional Area
Distal Tibia
-1.86%
Total Cross-Sectional Area
Diaphyseal Tibia
-1.67%
Cortical Area
Distal Tibia
-3.7%
Cortical Area
Diaphyseal Tibia
-1.89%
Bone Strength (Failure Load)
Diaphyseal Tibia
-1.72%
Key Findings
Older men with T2DM have significantly smaller total cross-sectional bone area at the distal and diaphyseal tibia compared to nondiabetic men.
Cortical area is reduced at the distal and diaphyseal tibia in men with T2DM.
Bone strength, measured as failure load at the diaphyseal tibia, is decreased in T2DM men, likely due to smaller bone size.
No significant differences in cortical porosity, cortical thickness, or trabecular microarchitecture were observed between T2DM and non-T2DM men.
Longer diabetes duration (≥10 years) and insulin use are associated with increased cortical porosity and reduced cortical bone parameters, indicating more severe bone deterioration.
Insulin use correlates with lower volumetric BMD and bone strength at multiple skeletal sites, possibly reflecting more advanced disease and microvascular complications.
Clinical Implications
Assessment of fracture risk in elderly men with T2DM should consider bone size reduction as a contributing factor beyond BMD measurements. Monitoring diabetes duration and insulin therapy status may help identify patients at higher risk of cortical bone deterioration. These findings highlight the need for targeted strategies to preserve bone strength and prevent fractures in this population.
Conclusion
In elderly men with type 2 diabetes, reduced bone cross-sectional area and cortical bone deficits contribute to compromised bone strength, potentially increasing fracture risk. Further research is needed to elucidate mechanisms and improve fracture risk prediction in this group.
References
Faraj et al 2023 -- Bone Microstructure in Elderly Men with Type 2 Diabetes
