Bone Phenotype Assessed by HRpQCT and Associations with Fracture Risk in the GLOW Study.

Area of Science:

• Osteoporosis research
• Bone densitometry
• Geriatric medicine

Background:

• Fractures in postmenopausal women are a significant health concern.
• Previous studies like the Global Longitudinal study of Osteoporosis in Women (GLOW) explored epidemiology and pathogenesis.
• The relationship between bone imaging outcomes and fracture risk in the GLOW cohort remained unexamined.

Purpose of the Study:

• To investigate the association between high-resolution peripheral quantitative computed tomography (HRpQCT) parameters and fracture incidence.
• To compare HRpQCT findings in the UK GLOW cohort with older participants from the Hertfordshire Cohort Study (HCS).
• To extend fracture risk analysis to include tibial HRpQCT measurements.

Main Methods:

• Analysis of fracture events in 321 postmenopausal women (mean age 70.6 years) from the UK GLOW study.
• HRpQCT of the distal radius and tibia, and dual-energy X-ray absorptiometry (DXA) of the hip were performed.
• Cluster analysis was used to identify distinct bone phenotypes at each site and assess fracture risk.

Main Results:

• Two radial clusters (3 and 4) showed significantly lower hip bone mineral density (BMD) than Cluster 1; only Cluster 4 had significantly higher fracture risk.
• At the tibia, clusters 1, 3, and 4 had lower hip BMD than Cluster 2; Cluster 3 exhibited significantly higher fracture risk.
• Radial HRpQCT findings in GLOW were comparable to HCS, suggesting utility in fracture risk assessment.

Conclusions:

• HRpQCT parameters, particularly at the radius, provide valuable insights into fracture risk in postmenopausal women.
• Combining HRpQCT variables may enhance fracture risk prediction in populations where this technology is available.
• Tibial HRpQCT data offers further information on fracture phenotypes, warranting validation in other studies.