Cross cultural adaptation, reliability and validity of the Polish version of the Cumberland Ankle Instability Tool.

Abstract

<b>Purpose:</b> The aim of this study was to develop a Polish version of the Cumberland Ankle Instability Tool (CAIT-PL) questionnaire and perform CAIT-PL cultural adaptation with assessment of its psychometric properties.<b>Methods:</b> The original CAIT was translated into the Polish language using standard guidelines. The CAIT-PL was completed on 2 occasions by 105 participants both with and without a history of ankle sprains. Psychometric evaluation of CAIT-PL included an assessment of internal consistency, test-retest reliability, standard error of measurement, convergent and construct validity.<b>Results:</b> The CAIT-PL was successfully translated and adapted into Polish culture with satisfactory internal consistency (Cronbach's α = 0.83) and adequate test-retest reliability resulting in ICC_2,1 = 0.89 (95% CI: 0.84-0.92). Measurement error was low (SEM = 0.76 and MDC = 2.10). Convergent validity of the CAIT-PL ranged from weak to strong using Spearman's correlation coefficient between CAIT-PL and FAOS subscales (<i>r</i> = 0.39-0.67; <i>p</i> < 0.05). Construct validity was confirmed.<b>Conclusion:</b> The Polish version of the Cumberland Ankle Instability Tool is a valid and reliable questionnaire for assessment of functional ankle instability among the Polish population.