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Development of the patient-based outcome instrument for foot and ankle: part 2: results from the second field survey: validity of the outcome instrument for the foot and ankle version 2

  • Original Article
  • Published:
Journal of Orthopaedic Science

An Erratum to this article was published on 20 October 2011

Abstract

Background

The Clinical Outcomes Committee of the Japanese Society for Surgery of the Foot (JSSF) has conducted the second Field Survey of the Outcome Instrument for the Foot and Ankle version 2.

Methods

The survey of the Outcome Instrument version 2, which was composed of 43 items, was performed in 313 patients (154 men and 159 women) who had pathological conditions related to the foot and ankle. Optional sports items in the Outcome Instrument version 2 were analyzed in 123 patients. Internal consistency and construct validity of the Outcome Instrument version 2 were assessed. Correlation of the Outcome Instrument version 2 score with Short Form 36 (SF36) and JSSF scores was analyzed to evaluate criterion validity.

Results

Both the EFA and CFA demonstrated good alignment of questionnaire items with their intended subscales in most cases. Sports items were not clearly classified into subgroups. Therefore, it seemed reasonable to use those as a set of questions in a single subscale. The present subscales, having similar names as the SF36 subscales, were closely correlated with the respective subscales. In those cases, the magnitude of the correlation coefficient was >0.6 (p < 0.001) except the present subscale called General Health and Well-being. Comparison of the present scores with JSSF evaluation scores showed satisfactory results except in patients with rheumatoid arthritis.

Conclusions

The Outcome Instrument version 2 demonstrated acceptable psychometric performances as outcome measures for patients with pathological conditions related to the foot and ankle. This outcome instrument would be helpful to evaluate patients with foot and/or ankle impairment. However, the analyses of the test-retest reliability and the influence of background factors such as age and gender, etc., on Outcome Instrument version 2 are needed in the third field survey.

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Acknowledgments

This study was supported by grants from the JSSF (Japanese Society for Surgery of the Foot) and the JOA (Japanese Orthopaedic Association). In addition, the authors would like to thank all the orthopaedic surgeons who collaborated with the field survey. We declare that we have no conflict of interest regarding the present manuscript.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan

    Hisateru Niki

  2. Unit of Medical Statistics, Faculty of Medical Education and Culture, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan

    Shinobu Tatsunami

  3. Department of Orthopaedic Surgery, Tokyo Metropolitan Police Hospital, 4-22-1 Nakano, Nakano-ku, Tokyo, 164-8541, Japan

    Naoki Haraguchi

  4. Department of Orthopaedic Surgery, Nippon Medical School Musashikosugi Hospital, 1-396 Kosugi-cho, Nakahara-ku, Kawasaki, Kanagawa, 211-8533, Japan

    Takafumi Aoki

  5. Division of Vital Care and Reconstructive Medicine, Department of Orthopaedic Surgery, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki, Osaka, 569-8686, Japan

    Ryuzo Okuda

  6. Department of Orthopaedic Surgery, School of Medicine, Keio University, 35 Shinano-machi, Shinjyuku-ku, Tokyo, 160-8582, Japan

    Yasunori Suda

  7. Department of Orthopaedic Surgery, Teikyo University School of Medicine, 2-11-1 Kaga, Itabashi-ku, Tokyo, 173-8606, Japan

    Masato Takao

  8. Department of Orthopaedic Surgery, Nara Medical University, 840 Sijyo-cho, Kashihara, Nara, 634-8522, Japan

    Yasuhito Tanaka

Authors
  1. Hisateru Niki
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  2. Shinobu Tatsunami
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  3. Naoki Haraguchi
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  4. Takafumi Aoki
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  5. Ryuzo Okuda
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  6. Yasunori Suda
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  7. Masato Takao
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  8. Yasuhito Tanaka
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Corresponding author

Correspondence to Hisateru Niki.

Additional information

All the authors belong to The Clinical Outcomes Committee of the Japanese Society for Surgery of the Foot (JSSF).

An erratum to this article can be found at http://dx.doi.org/10.1007/s00776-011-0169-5

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Niki, H., Tatsunami, S., Haraguchi, N. et al. Development of the patient-based outcome instrument for foot and ankle: part 2: results from the second field survey: validity of the outcome instrument for the foot and ankle version 2. J Orthop Sci 16, 556–564 (2011). https://doi.org/10.1007/s00776-011-0131-6

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  • DOI: https://doi.org/10.1007/s00776-011-0131-6

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