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Urban versus rural differences of hip fractures among the elderly in Kyoto, Japan: a 10-year study

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Abstract

Summary

Secular changes in the incidence rate of hip fractures were estimated to vary by fracture type, i.e., femoral neck or trochanteric fractures, age, and sex, in urban or rural areas in Kyoto Prefecture, Japan from 2008 to 2017.

Purpose

Our survey in Kyoto Prefecture from 2008 to 2017 showed that the incidence rate of femoral neck fractures is generally increasing. We investigated the differences between urban and rural areas in the changes of the incidence rate over time of femoral neck and trochanteric fractures during the same period.

Methods

Patients aged 65 years and above who sustained hip fractures between 2008 and 2017 and were treated at one of the participating 11 hospitals were included. The ratio of sick beds for acute-term care at the investigated hospitals to total number of beds in the urban area was 16.5% (1863/11,158) and 30.6% (1863/5623) in the rural area. The change in incidence rate was estimated utilizing the population according to the national census conducted in 2010 and 2015.

Results

There were 3559 and 6474 hip fractures in the urban and rural areas, respectively. Femoral neck fractures were 1936 (54.4%) and 2813 (43.5%) in each area. The increase of the population-adjusted numbers was marked by neck fractures in males, in both areas. In women, there was a significant increase in femoral neck fractures in the urban area in those aged 85 years and over. For trochanteric fractures, a significant increase was only found in women aged 65 to 74 years in the rural area.

Conclusion

A regional difference in the secular changes in incidence rate of hip fractures was found in women, not in men, mostly because neck fractures in women increased in the over 85 group in the urban area.

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Acknowledgements

All authors would like to thank the following for their invaluable help and contribution to the study by registering their cases at each institution:

North Medical Center Kyoto Prefectural University of Medicine

Maizuru Red Cross Hospital

Fukuchiyama City Hospital

Ayabe City Hospital

Kyoto Chubu Medical Center

Japanese Red Cross Kyoto Daiichi Hospital

Japanese Red Cross Kyoto Daini Hospital

Rakuwakai Marutamachi Hospital

Kyoto Kuramaguchi Medical Center

Kyoto Kizugawa Hospital

Tanabe Central Hospital

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Authors and Affiliations

Authors

Contributions

MH, KI, MA, NK, and KT contributed to the conception and design of the study. NO, MH, MA, and TG participated in data collection. MH, NO, and NK performed the statistical analysis. NO, MH, KI, and MA drafted the manuscript. All authors read and approved the final manuscript. MA did the English editing.

Corresponding author

Correspondence to Naoki Okubo.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval was obtained from the ethics committee of the Kyoto Prefectural University of Medicine.

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For this type of study, formal consent is not required.

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Okubo, N., Horii, M., Ikoma, K. et al. Urban versus rural differences of hip fractures among the elderly in Kyoto, Japan: a 10-year study. Arch Osteoporos 16, 160 (2021). https://doi.org/10.1007/s11657-021-01029-x

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