Danish translation of the Foot and Ankle Outcome Score.

INTRODUCTION

The Foot and Ankle Outcome Score (FOAS) is a standardized instrument used to report on injury-specific clinical status following foot- and ankle-related problems. The primary aim of this study was to translate and conduct a cross-cultural adaptation of the FAOS into a Danish setting, including testing absolute agreement and the test-retest reliability of the questionnaire.

METHODS

Translation of the FAOS questionnaire was 
carried out according to the Principles of Good Practice for the Translation and Cultural Adaptation Process for Patient-
Reported Outcomes Measures: report of the Society for Pharmacoeconomics and Outcomes Research Task Force 
for Translation and Cultural Adaptation.

RESULTS

No major disagreements were observed between the original and translated version of the FAOS questionnaire during the translation procedure and cognitive interview. A total of 51 patients were included in the reliability testing procedure. The test-retest reliability was high: pain interclass correlation coefficient (ICC) 0.88 (95% confidence interval (CI): 0.79-0.93), symptoms ICC 0.95 (95% CI: 0.91-0.97), activities of daily living ICC 0.95 (95% CI: 0.90-0.97), sport ICC 0.95 (95% CI: 0.90-0.97) and quality of life ICC 0.94 (95% CI: 0.90-0.97). The Bland-Altman plots showed good agreement between test and retest for all five subscales.

CONCLUSIONS

The translation of the FAOS questionnaire into Danish was done in accordance with best practice and has excellent repeatability in patients treated for ankle fractures.

FUNDING: none.

TRIAL REGISTRATION: not relevant.