Cross-cultural adaptation and validation of the shoulder rating questionnaire in Spanish patients with chronic nonsurgical shoulder pain.

Background: Chronic shoulder pain is characterized by persistent discomfort in the shoulder joint that can be due to various causes, affecting the patient's quality of life. Methods: One hundred twenty three participants (54.83 ± 11.73 years) completed the Spanish SRQ. Internal consistency, floor and ceiling effect, and test-retest reliability were analyzed. We also studied construct validity, as well as convergent (quick Disabilities of the Arm, Shoulder, and Hand questionnaire) and concurrent (12-item Short Form Health Survey) validity. The ability and accuracy to discriminate between patients with and without anxiety and depression cases was evaluated with the Hospital Anxiety and Depression Scale; a receiver-operating characteristic curve analysis was used. Results: The Spanish SRQ showed an appropriate level of internal consistency and test-retest reliability. Factor analysis revealed a 2-factor structure. The Spanish SRQ total score and domains showed good convergent and concurrent validity. The total score was significantly able to discriminate between participants with and without symptoms related to probable presence of anxiety or depression (cut-off point of 34.17). Conclusion: The Spanish SRQ was found to be a valid and reliable instrument for assessing shoulder symptoms and function and discriminating the probable presence of anxiety and depression in patients with chronic nonsurgical shoulder pain.