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Reliability and validity of the Western Ontario Shoulder Instability Index (WOSI) in the Japanese population

  • Original Article
  • Published:
Journal of Orthopaedic Science

Abstract

Background

The Western Ontario Shoulder Instability Index (WOSI) questionnaire is a disease-specific self-evaluated measurement tool used for patients with shoulder instability. The purpose of this study was to evaluate the reliability and validity of the WOSI Japanese version for the Japanese population.

Methods

The WOSI Japanese version was prepared by use of several steps including translation, back translation, and verification by the author and owner of the WOSI. Reliability (internal consistency and reproducibility) and validity were then tested for 85 patients with shoulder instability. All patients completed the WOSI Japanese version, Quick DASH, and SF-36, and underwent assessment of the Rowe rating scale for the purpose of internal consistency and validity. Fifty-nine of the patients repeated the WOSI 2 weeks after the first examination for assessment of test–retest reproducibility.

Results

Both internal consistency (0.84 for Cronbach’s alpha) and reproducibility (Pearson’s r = 0.91, intraclass correlation coefficient = 0.91) indicated the reliability of the WOSI Japanese questionnaire was good. Comparison with the Rowe rating scale (p < 0.001) also showed validity was good. The correlation coefficient between the WOSI Japanese version and the Quick DASH (Pearson’s r = 0.62) was higher than that between the WOSI Japanese version and the SF-36 (Pearson’s r = 0.10–0.36 for subscales).

Conclusion

The WOSI Japanese questionnaire is a reliable self-assessment tool that is comparable with the original English version. We therefore recommend use of the WOSI Japanese version when evaluating patients with shoulder instability in the Japanese population.

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Acknowledgments

We sincerely thank Drs. Norimasa Takahashi, Nobuaki Kawai, and Hisahiro Tonotsuka for their help.

Conflict of interest

The authors did not receive and will not receive any benefits or funding from any commercial party related directly or indirectly to the subject of this article.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980-8574, Japan

    Taku Hatta, Nobuhisa Shinozaki, Rei Omi, Hirotaka Sano, Nobuyuki Yamamoto & Eiji Itoi

  2. Shoulder and Elbow Service, Funabashi Orthopaedic Sports Medicine Center, Funabashi, Japan

    Akira Ando & Hiroyuki Sugaya

  3. Department of Orthopaedic Surgery, Iwaki Kyoritsu General Hospital, Iwaki, Japan

    Toshitake Aizawa

  4. Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University School of Medicine, Sendai, Japan

    Shinichi Kuriyama

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  1. Taku Hatta
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  2. Nobuhisa Shinozaki
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  4. Hirotaka Sano
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  8. Toshitake Aizawa
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  10. Eiji Itoi
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Corresponding author

Correspondence to Eiji Itoi.

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Hatta, T., Shinozaki, N., Omi, R. et al. Reliability and validity of the Western Ontario Shoulder Instability Index (WOSI) in the Japanese population. J Orthop Sci 16, 732–736 (2011). https://doi.org/10.1007/s00776-011-0141-4

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  • DOI: https://doi.org/10.1007/s00776-011-0141-4

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