Authors
Gokhan Maras, Gamze Gulsun Pala, Belma Degerli Maras
Published in
Journal of back and musculoskeletal rehabilitation. Pages 10538127261489868. Sep 18, 2026. Epub Sep 18, 2026.
Abstract
BackgroundSelf-report questionnaires are commonly used to assess functional status in patients with ankylosing spondylitis (AS). However, these instruments may not fully reflect patients' actual physical performance. The Back Performance Scale (BPS-TR) may provide a more objective, performance-based approach to evaluating functional limitations. This study aimed to investigate the psychometric properties of the BPS-TR in patients with AS.MethodsA total of 107 patients with AS were included. Functional performance was assessed using five standardized tasks: sock, pick-up, roll-up, fingertip-to-floor, and lifting tests. Convergent validity was examined using BASFI, BASDAI, ASQoL, and BASMI. Test-retest reliability was evaluated in 40 patients after a one-week interval using the intraclass correlation coefficient [ICC2,1].ResultsThe BPS-TR demonstrated excellent test-retest reliability [ICC2,1 = 0.890] and acceptable internal consistency (Cronbach's α = 0.787). Measurement error was small (SEM = 0.53; MDC95 = 1.47). Significant moderate correlations were found with BASFI (r = 0.654), ASQoL (r = 0.590), BASDAI (r = 0.615), and BASMI (r = 0.630) (all p < 0.001). Exploratory factor analysis supported a unidimensional structure explaining 62.4% of the total variance.ConclusionsThe BPS-TR is a valid, reliable, and practical performance-based scale for assessing functional limitations in patients with AS. Its use alongside self-report questionnaires may contribute to a more comprehensive evaluation of functional status in clinical practice.
PMID:
42758016
Bibliographic data and abstract were imported from PubMed on 18 Sep 2026.
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