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Development and validation of a functional disability index for chronic low back pain

Article type: Research Article

Authors: Duruöz, Mehmet Tuncaya; * | Özcan, Emelb | Ketenci, Aysegülb | Karan, Ayseb

Affiliations: [a] Physical Medicine and Rehabilitation Department, Rheumatology Division, Celal Bayar University Medical School, Manisa, Turkey | [b] Physical Medicine and Rehabilitation Department, Istanbul University Istanbul Medical School, Istanbul, Turkey

Correspondence: [*] Address for correspondence: Mehmet Tuncay Duruöz, MD., Physical Medicine and Rehabilitation Department, Rheumatology Division, Celal Bayar University Medical School, Evka 3 Mahallesi, 126/8 sokak, No: 3, Bornova, 35050 Izmir, Manisa, Turkey. Tel.: +90 533 512 1548; Fax: +90 232 375 5044; E-mail: [email protected]

Keywords: Chronic low back pain, functional disability, outcome assessment

DOI: 10.3233/BMR-2012-00349

Journal: Journal of Back and Musculoskeletal Rehabilitation, vol. 26, no. 1, pp. 45-54, 2013

Published: 28 January 2013
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Abstract

Objective:

To develop a valid and reliable functional disability scale for chronic low back pain (CLBP).

Methods:

Inpatients and outpatients suffering from low back pain (LBP) for at least 3 months were selected randomly. Patients with inflammatory LBP were not recruited. Interrater reliability and Cronbach’s α were examined. Face, content, convergent and divergent validities were investigated. Factor Analysis and pearson’s correlation coefficients (r) were performed.

Results:

112 patients (71 females) with a mean age of 39.93 (SD: 12.92) answered the 66 questions on the provisional scale. Elimination left 18 daily activity questions. The interrater reliability of the scale was 0.79 and Cronbach’s α was 0.90. Face and content validities were determined. It showed good convergence with the Quebec Back Pain Disability Scale (r: 0.82), the Oswestry Disability Index (r: 0.76), Waddell’s Functional Index (r: 0.68), and the Visual Analog Scale of Handicap (VAS-handicap) (r: 0.49) The scale showed no significant or fair relationship (divergence) with VAS-lumbar, VAS-radicular, Beck Depression Inventory, morning stiffness, night pain, finger tip-ground distance, radicular pain duration, or modified Schöber’s index. The scale had two main factors. First represents activities implicating forward bending and second represents standing activities.

Conclusion:

A practical functional disability scale for CLBP was developed and validated.

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