Rasch analysis of Dutch-translated version of the Foot Impact Scale for rheumatoid arthritis

Objective. To translate the Foot Impact Scale for RA (FIS-RA) to the Dutch target language and to evaluate its internal construct validity using Rasch analysis. Methods. Forward and backward translations of the original English version of the FIS-RA scale, combined with synthesis techniques and expert committee review, were undertaken to produce a final Dutch version with two subscales for impairment/footwear (FIS-RA IF ) and activity/participation (FIS-RA AP ). The pre-final version was field tested in RA patients to investigate face and content validity. FIS-RA questionnaires were completed... Mehr ...