The reliability and validity of a digital version of the Cumberland Ankle Instability Tool

Purpose: The Cumberland Ankle Instability Tool is a common patient reported outcome used to assess those with Chronic Ankle Instability. However, paper versions of the Cumberland Ankle Instability Tool have only been assessed for reliability purposes. The purpose of this study was to assess the agreement and reliability of a digital version of the Cumberland Ankle Instability Tool-Digital. Materials and methods: Sixty-eight participants with a history of ankle sprain(s) were recruited to participate in this study. Participants completed a paper version of the Cumberland Ankle Instability Tool and a digital version then returned one week later and completed them again. Intraclass correlation coefficients (ICC) and Kappa coefficients were used to determine the agreement between the paper and digital versions as well as test-retest reliability between the two time periods. Results: The digital version showed excellent reliability (ICC = 0.93, 95% CI: 0.89–0.96) with the paper version. The test-retest reliability between testing sessions was considered good (ICC = 0.86, 95% CI: 0.77–0.92). A majority of individual items on the digital version demonstrated substantial agreement (κ = 0.60–0.81) with the paper version. Conclusions: A digital version of the Cumberland Ankle Instability Tool demonstrated good to excellent psychometric properties. Clinicians who utilize a digital version as part of an electronic medical record system can utilize them confidently to accurately assess patients with Chronic Ankle Instability. Future studies may want to consider assessing a digital version with expanded clinical and research populations.Implications for rehabilitation The digital version of the Cumberland Ankle Instability Tool demonstrated adequate psychometric properties. The digital version of the Cumberland Ankle Instability Tool can be considered a reliable instrument for the assessment of Chronic Ankle Instability. A digital version of the Cumberland Ankle Instability Tool can provide automated scoring and quick administration for clinicians in a rehabilitation setting.