The Psychometric properties of the Roland Morris Disability Questionnaire for Patients with Chronic Mechanical Low Back Pain

Buchanan, Helen

The Psychometric properties of the Roland Morris Disability Questionnaire for Patients with Chronic Mechanical Low Back Pain

Journal Article

2007

Journal Title

South African Journal of Physiotherapy

Link to Journal

http://www.sajp.co.za/index.php/sajp/index

Publisher

University of Cape Town

Department

Occupational and Environmental Health RU

Faculty

Faculty of Health Sciences

Abstract

Purpose: Functional status measures are currently not widely used in South Africa to facilitate clinical decision-making or document treatment outcomes for patients with low back pain (LBP). This study investigated the internal consistency and clinical utility of a back-specific functional status measure, the Roland Morris Disability Questionnaire (RMDQ), and determined its ability to confirm the need for spinal fusion surgery. Method: Aretrospective, descriptive design was used with 42 patients with chronic mechanical low back pain who consulted a private Orthopaedic surgeon in Cape Town over a one year period. All patients completed the RMDQ prior to their consultation. On completion of the medical examination, a rating for surgery was determined for each patient. The completed questionnaires were analysed using Statistical Package for the Social Sciences (SPSS). Results: The mean RMDQ score was 8.6 (N=42; median=9.0; range=2-21). Cronbach’s alpha showed a high internal consistency between items (.92). A categorical principal component analysis (CATPCA) identified two distinct dimensions in the RMDQ. Item reduction improved the internal consistency and thus the construct validity of the RMDQ. There was a low correlation between the surgeon’s rating for surgery and RMDQ scores (r=.40; P<.01). Conclusion: The RMDQ shows some good psychometric properties but some adjustments could improve it. The RMDQ cannot be used to predict the need for spinal fusion surgery.