Dual-panel translation to Danish and Rasch validation of the Foot and Ankle Ability Measure (FAAM-DK)

Abstract

Background: The Foot and Ankle Ability Measure (FAAM) was developed by involvement of patients with chronic ankle instability (CAI) and has acceptable measurement properties, but is not available in Danish.

Methods: FAAM was translated and culturally adapted into Danish, and its measurement properties were assessed using Rasch analyses.

Results: A Danish version was produced with small adaptations, and content relevance was confirmed by Danish patients. The 21-item ADL domain showed misfit to the Rasch model, but after removing six items, the resulting 15-item scale displayed adequate fit. The Sports domain also exhibited misfit, but after removing one item and adjusting due to differential item functioning related to age for another item, a 7-item scale showed good fit. This resulted in a 22-item 2-dimensional Danish version of FAAM.

Conclusion: The 22-item Danish FAAM exhibits robust measurement properties for patients with various conditions of the lower leg, ankle, and foot, including CAI.

Keywords: Chronic ankle instability; Dual-panel translation; PROMs; Rasch analysis.