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Meta-Analysis
. 2017 Sep 15;8(5):728-738.
doi: 10.3945/an.117.015545. Print 2017 Sep.

Abdominal Obesity and Risk of Hip Fracture: A Systematic Review and Meta-Analysis of Prospective Studies

Omid Sadeghi  1   2 , Parvaneh Saneei  3 , Morteza Nasiri  4 , Bagher Larijani  5 , Ahmad Esmaillzadeh  2   6   7
Affiliations
Meta-Analysis

Abdominal Obesity and Risk of Hip Fracture: A Systematic Review and Meta-Analysis of Prospective Studies

Omid Sadeghi et al. Adv Nutr. .

Abstract

Data on the association between general obesity and hip fracture were summarized in a 2013 meta-analysis; however, to our knowledge, no study has examined the association between abdominal obesity and the risk of hip fracture. The present systematic review and meta-analysis of prospective studies was undertaken to summarize the association between abdominal obesity and the risk of hip fracture. We searched online databases for relevant publications up to February 2017, using relevant keywords. In total, 14 studies were included in the systematic review and 9 studies, with a total sample size of 295,674 individuals (129,964 men and 165,703 women), were included in the meta-analysis. Participants were apparently healthy and aged ≥40 y. We found that abdominal obesity (defined by various waist-hip ratios) was positively associated with the risk of hip fracture (combined RR: 1.24, 95% CI: 1.05, 1.46, P = 0.01). Combining 8 effect sizes from 6 studies, we noted a marginally significant positive association between abdominal obesity (defined by various waist circumferences) and the risk of hip fracture (combined RR: 1.36; 95% CI: 0.97, 1.89, P = 0.07). This association became significant in a fixed-effects model (combined effect size: 1.40, 95% CI: 1.25, 1.58, P < 0.001). Based on 5 effect sizes, we found that a 0.1-U increase in the waist-hip ratio was associated with a 16% increase in the risk of hip fracture (combined RR: 1.16, 95% CI: 1.04, 1.29, P = 0.007), whereas a 10-cm increase in waist circumference was not significantly associated with a higher risk of hip fracture (combined RR: 1.13, 95% CI: 0.94, 1.36, P = 0.19). This association became significant, however, when we applied a fixed-effects model (combined effect size: 1.21, 95% CI: 1.15, 1.27, P < 0.001). We found that abdominal obesity was associated with a higher risk of hip fracture in 295,674 individuals. Further studies are needed to test whether there are associations between abdominal obesity and fractures at other bone sites.

Keywords: abdominal obesity; hip fracture; meta-analysis; waist circumference; waist-hip ratio.

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Conflict of interest statement

Author disclosures: OS, PS, MN, BL, and AE, no conflicts of interest.

Figures

FIGURE 1
FIGURE 1
Flowchart of study selection.
FIGURE 2
FIGURE 2
Forest plot for the association between abdominal obesity (based on waist circumference) and risk of fractures (including hip fractures and any fractures) in adults aged ≥40 y by use of a random-effects model. ES, effect size.
FIGURE 3
FIGURE 3
Forest plot for the association between abdominal obesity (based on waist-hip ratio) and risk of fractures (including hip fractures and any fractures) in adults aged ≥40 y by use of a random-effects model. ES, effect size.
FIGURE 4
FIGURE 4
Forest plot for the risk of hip fracture based a 10-cm increase in waist circumference in adults aged ≥40 y by use of a random-effects model. ES, effect size.
FIGURE 5
FIGURE 5
Forest plot for the risk of hip fracture based a 0.1-U increase in waist-hip ratio in adults aged ≥40 y by use of a random-effects model. ES, effect size.
See this image and copyright information in PMC

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