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Atypical subtrochanteric fractures in Korean hip fracture study

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Abstract

Summary

In Korean, atypical subtrochanteric fractures (ASF) were rare. Higher BMI and use of bisphosphonate were significant risk factors of ASF.

Introduction

Recently, ASF have been reported to increase among patients on bisphosphonate. However, the incidence of ASF and the association between ASF and bisphosphonate use have not been well defined in Asian population. Our purposes are (1) to estimate the proportion of ASF among Korean patients with proximal femur fracture and (2) to determine the associated risk factors of ASF in the Korean patients.

Methods

We conducted a multicenter (16 academic hospitals), prospective Korean hip fracture study on hip fracture in a cohort of patients aged 50 years or older from South Korea between July 2014 and May 2016. As a part of Korean hip fracture study, primary analysis examined the proportion of ASF among proximal femur fracture. To identify ASF, according to the definition by ASBMR task force, all radiographs of subtrochanteric fracture were reviewed. Associated risk factors for occurrence of ASF were also evaluated by using multivariable logistic regression analysis.

Results

Among 1361 patients with proximal femoral fractures due to low-energy trauma, 17 fractures (1.2%) were identified as ASF. Higher BMI and use of bisphosphonate before injury were independent risk factors of ASF.

Conclusion

In Korean, ASF were rare. Higher BMI and use of bisphosphonate were significant risk factors of ASF.

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Acknowledgements

This research was supported by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health and Welfare, Republic of Korea (grant number: HC15C1189 and HI10C2020).

All authors were responsible for the drafting of the manuscript and revising the contents, and all authors approved the final version of the manuscript.

Author information

Author notes

  1. Young-Kyun Lee and Tae-Young Kim equally contributed to this work and should be considered as co-first authors.

Authors and Affiliations

  1. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam, South Korea

    Y.-K. Lee

  2. Department of Orthopaedic Surgery, Hallym University Sacred Heart Hospital, Anyang, South Korea

    T.-Y. Kim

  3. Department of Orthopaedic Surgery, College of Medicine, Chung-Ang University, 224-1 Heukseok-dong, Dongjak-gu, Seoul, 156-755, South Korea

    Y.-C. Ha

  4. Department of Orthopaedic Surgery, Myongji Hospital, Goyang, South Korea

    S.-H. Song

  5. Department of Orthopedic Surgery, Haeundae Paik Hospital, College of Medicine, Inje University, Busan, South Korea

    J. W. Kim

  6. Department of Orthopaedic Surgery, College of Medicine, Chungbuk National University, Cheongju, South Korea

    H. C. Shon

  7. Department of Orthopedic Surgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, South Korea

    J. S. Chang

  8. Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, South Korea

    K.-H. Koo

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  1. Y.-K. Lee
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Corresponding author

Correspondence to Y.-C. Ha.

Ethics declarations

This study was conducted according to the Declaration of Helsinki. Approval was obtained from the institutional review boards at each site.

Informed consent

Written informed consent was obtained from all subjects.

Conflicts of interest

None.

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Lee, YK., Kim, TY., Ha, YC. et al. Atypical subtrochanteric fractures in Korean hip fracture study. Osteoporos Int 28, 2853–2858 (2017). https://doi.org/10.1007/s00198-017-4112-2

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  • DOI: https://doi.org/10.1007/s00198-017-4112-2

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