Association between composite indices of femoral neck strength and odds of hip fracture

Abstract

Summary

This study aimed to assess the association between composite indices of femoral neck strength and the odds of hip fracture in Chinese adults.After adjusting for confounders, higher values of CSI and ISI were associated with a lower risk of fracture. They may provide useful information for improving hip fracture risk assessment.

Purpose

With the increased incidence of hip fractures worldwide, numerous studies have reported that composite indices of femoral neck strength can improve hip fracture risk assessment. This study aimed to assess the association between composite indices of femoral neck strength and the odds of hip fracture in Chinese adults.

Methods

This retrospective cross-sectional study conducted at Changzhou Second People’s Hospital included 937 Chinese adults (248 with hip fractures). After overnight fasting for ≥ 8 h, blood samples were collected from all participants within 24 h of admission. Composite indices of femoral neck strength were derived by combining bone mineral density, weight, and height with femoral axis length and width, which were measured by dual-energy X-ray absorptiometry.

Results

In total, 937 participants (293 men and 644 women) were enrolled. The mean age was 68.3 years (SD 10.5). After adjusting for confounders, higher values of CSI and ISI were associated with a lower odd of hip fracture. Increase in CSI (per 1 g/m·kg) was associated with a 46% decrease in the odd of hip fracture (OR = 0.54; 95% CI, 0.39–0.74), and increase in ISI (per 0.1 g/m·kg) was associated with an 82% decrease (OR, 0.18; 95% CI, 0.11–0.30). Effect sizes of CSI and ISI on the odds of hip fracture remained robust and reliable in subgroup analyses.

Conclusions

Increased CSI and ISI were associated with a lower odd of hip fracture, especially in women, suggesting that composite indices of femoral neck strength may provide useful information for improving hip fracture risk assessment.