Comparative study of psychometric properties of three assessment tools for degenerative rotator cuff disease

Objective:To compare psychometric properties of Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire, Shoulder Pain and Disability Index (SPADI) and Constant–Murley scale, in patients with degenerative rotator cuff disease (DRCD).Design:Longitudinal cohort.Setting:One French university hospital.Methods:The scales were applied twice at one-week interval before physiotherapy and once after physiotherapy two months later. The perceived improvement after treatment was self-assessed on a numerical scale (0–4). The test–retest reliability of the DASH, SPADI and Constant–Murley scales was assessed before treatment by the intraclass correlation coefficient (ICC). The responsiveness was assessed by the paired t-test (P < 0.05) and standardized mean difference (SMD). The correlation between the percentage of variation in scale scores and the self-assessed improvement score after treatment was measured by the Spearman coefficient.Results:Fifty-three patients were included. Twenty-six only were available f...