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Prediction of hip osteoporotic fractures from composite indices of femoral neck strength

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Abstract

Objective

To clarify whether composite hip strength indices improve predictive ability for hip osteoporotic fractures independent of conventional bone mineral density (BMD).

Subjects and methods

Three hundred and eighty-two health controls and 43 women with hip fractures (aged 28.2–87.7 years, mean age 59.5±9.2 years) were measured by dual energy X-ray absorptiometry for femoral neck bone mineral density (FN_BMD) and proximal femur geometry parameters of hip, and composite hip strength indices (Compression strength index, Bending strength index, and Impact strength index). The association between the studied parameters and the fractures was modelled using multiple logistic regression, including age, height, weight, and menopausal status. Fracture-predicted probability was calculated for each predictor tested. ROC curve areas (AUCs) were calculated for the fracture status, having the calculated fracture-predicted probability as a test variable. AUCs were compared by the Hanley–McNeil test.

Results

Women with hip fractures had lower FN_BMD, composite hip strength indices, and longer hip axis length than controls, and no significant difference in femoral neck width. Logistic regression showed composite hip strength indices could predict hip fractures risk. To the same extent as FN BMD, Compression Strength Index (CSI) best predicted the risk for each fracture (AUC = 0.787 ± 0.028). When CSI was added to FN_BMD, there was a small but not statistically significant increase in AUC to 0.796 ± 0.027 (P = 0.9018).

Conclusion

Composite indices of femoral neck strength may be valuable in the assessment of the biomechanics of bone fragility; however, they do not appear to add diagnostic value to the simple measurement of BMD.

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Acknowledgements

This study was supported by grant from the Foundation of Shanghai education commission, China (NO. 2010JW53). The authors would like to express their great appreciation to Zi-Ming Zhou, Qing-Jiao Zhang for their assistance in the recruitment of participants and editing help and Lei Zhou for hers advisory function in the statistical analysis. We wish to thank anonymous reviewers for comments that help us to improve the quality of our manuscript.

Conflict of interest

The authors declare that they have no conflict of Interest.

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Authors and Affiliations

  1. Department of Radiology, Yueyang Hospital affiliated to ShangHai University of Traditional Chinese Medicine, Shanghai, China, 200437

    Guan-Wu Li, Shi-Xin Chang, Yao Chen & Hong Bao

  2. Department of Medical technology, Xinzhuang Community Health Service Center, Shanghai, China, 201100

    Zheng Xu

  3. Department of Geriatrics, Yueyang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China, 200437

    Xiao Shi

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  1. Guan-Wu Li
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  2. Shi-Xin Chang
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  4. Yao Chen
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  5. Hong Bao
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Correspondence to Shi-Xin Chang.

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Li, GW., Chang, SX., Xu, Z. et al. Prediction of hip osteoporotic fractures from composite indices of femoral neck strength. Skeletal Radiol 42, 195–201 (2013). https://doi.org/10.1007/s00256-012-1473-7

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  • DOI: https://doi.org/10.1007/s00256-012-1473-7

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