Validation of the Turkish version of the foot and ankle outcome score

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Abstract
The objective is to develop a Turkish version of the foot and ankle outcome score (FAOS) and to investigate its validity and reliability. The Turkish version of FAOS was developed after the translation and back-translation. The translated version was pretested on 20 patients with rheumatoid arthritis. Then, the Turkish FAOS was administered to 55 patients having foot and ankle problems. They were also evaluated by using the four subscales of the Turkish version of AIMS2, and the Turkish version of SF-36 questionnaire to test validity. Fifty patients filled out the FAOS for second time to determine test–retest reliability. Construct validity was investigated with use of Spearman’s rank correlation coefficient. Test–retest reliability was assessed with use of the intraclass correlation coefficient (ICC) and Cronbach’s alpha score. The psychometric properties of the Turkish FAOS were generally similar to the original FAOS. The random ICC for the five subscales ranged from 0.70 to 0.96. The Cronbach’s alpha coefficient ranged from 0.79 to 0.97. Construct validity of the FAOS was good. The Turkish FAOS correlated with the SF-36 and AIMS2 scales. The Turkish version of FAOS was valid and reliable instrument to assess the foot and ankle related problems. However, to assess its responsiveness further studies are needed.

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