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Comparative study of psychometric properties of three assessment tools for degenerative rotator cuff disease
Etienne James-Belin1,2, Anne Laure Roy1,2, Sandra Lasbleiz2
11 Service de Médecine Physique et de Réadaptation, Groupe Hospitalier Lariboisière-Fernand-Widal, AP-HP, Université Paris 7, Paris, France.
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 for reliability. The test-retest reliability was very good for the DASH (ICC = 0.97), SPADI (0.95) and Constant-Murley (0.92). The scale score was improved after treatment for each scale ( P < 0.05). The SMD was moderate for the DASH (0.56) and SPADI (0.56) scales, and small for the Constant-Murley (0.44). The correlation between the percentage of variation in scores and self-assessed improvement score after treatment was high, moderate and not significant for the SPADI (0.59, P < 0.0001), DASH (0.42, P < 0.01) and Constant-Murley scales, respectively.
Conclusion::
The test-retest reliability of the DASH, SPADI and Constant-Murley scales is very good for patients with DRCD. The highest responsiveness was achieved with the SPADI.
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