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Measurement properties of the Dutch version of the Western Ontario Shoulder Instability Index (WOSI)

  • Original Article
  • Published:
Journal of Orthopaedic Science

Abstract

Background

The Western Ontario Shoulder Instability Index (WOSI) is a disease-specific shoulder questionnaire to measure quality of life in patients with shoulder instability. The aim of the present study was to translate the WOSI into Dutch and assess its principal measurement properties.

Methods

The WOSI was translated into Dutch according to guidelines in the literature. Fifty-two shoulder instability patients completed the questionnaire twice within 2 weeks. We assessed internal consistency (Cronbach’s alpha), test–retest reliability [Intraclass Correlation Coefficient (ICC)], standard error of measurement (SEM), smallest detectable change (SDC) and reliable change index. The Bland–Altman analysis was applied to assess test–retest agreement and floor and ceiling effects were calculated.

Results

Cronbach’s alpha was 0.95 for the total WOSI score (range 0.88–0.95 for the 4 domains). ICC for the total WOSI score was 0.91 (range 0.79–0.90 for domains), SEM was 130.6 for the total WOSI score resulting in a SDC of 362.0, which is 17.3 % of the maximum obtainable score of 2100. Bland–Altman analysis showed no systematic differences or consistent bias between the two assessments. We observed no relevant floor and ceiling effects.

Conclusion

The results of the present study suggest the Dutch version of the WOSI is a reliable tool for clinical assessment and scientific evaluation. It shows high values for Cronbach’s alpha and ICC implying excellent internal consistency and good test–retest reliability.

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Acknowledgments

We thank Sharon Griffin for her permission to translate the original WOSI, Arthur de Gast for his participation in the translation process and Caroline Terwee for her assistance in interpreting COSMIN correctly.

Conflict of interest

The authors, their immediate family, and any research foundation with which they are affiliated did not receive any financial payments or other benefits from any commercial entity related to the subject of this article.

Author information

Authors and Affiliations

  1. Department of Rehabilitation Medicine, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, The Netherlands

    Suzanne H. Wiertsema, Marc B. Rietberg, Karin M. Hekman & Maaike Schothorst

  2. Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

    Pieter Bas de Witte

  3. Institute for Applied Health Research and School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, UK

    Martijn P. Steultjens

  4. Department of Rehabilitation Medicine and EMGO Institute, VU University Medical Center, Amsterdam, The Netherlands

    Joost Dekker

Authors
  1. Suzanne H. Wiertsema
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  2. Pieter Bas de Witte
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  3. Marc B. Rietberg
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  4. Karin M. Hekman
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  5. Maaike Schothorst
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  6. Martijn P. Steultjens
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  7. Joost Dekker
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Corresponding author

Correspondence to Suzanne H. Wiertsema.

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Wiertsema, S.H., de Witte, P.B., Rietberg, M.B. et al. Measurement properties of the Dutch version of the Western Ontario Shoulder Instability Index (WOSI). J Orthop Sci 19, 242–249 (2014). https://doi.org/10.1007/s00776-013-0517-8

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  • DOI: https://doi.org/10.1007/s00776-013-0517-8

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