Is Spinal Mobility in Patients With Spondylitis Determined By Age, Structural Damage, and Inflammation?

Objective To explore the association between mobility, inflammation, and structural damage in ankylosing spondylitis (AS). Methods Patients with AS were included in a cross‐sectional study in which spinal mobility was measured by the Bath Ankylosing Spondylitis Metrology Index (BASMI) and by the Uni...

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Published in:Arthritis care & research (2010) 2015-01, Vol.67 (1), p.74-79
Main Authors: Calvo‐Gutierrez, Jerusalem, Garrido‐Castro, Juan L., Gil‐Cabezas, Jesus, Gonzalez‐Navas, Cristina, Ugalde, Pilar Font, Carmona, Loreto, Collantes‐Estevez, Eduardo
Format: Article
Language:English
Subjects:
Adult
Age Factors
Cross-Sectional Studies
Female
Humans
Inflammation - diagnostic imaging
Inflammation - physiopathology
Male
Middle Aged
Mobility Limitation
Radiography
Range of Motion, Articular - physiology
Severity of Illness Index
Spine - diagnostic imaging
Spine - physiology
Spondylitis, Ankylosing - diagnostic imaging
Spondylitis, Ankylosing - physiopathology
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Summary:Objective To explore the association between mobility, inflammation, and structural damage in ankylosing spondylitis (AS). Methods Patients with AS were included in a cross‐sectional study in which spinal mobility was measured by the Bath Ankylosing Spondylitis Metrology Index (BASMI) and by the University of Córdoba Ankylosing Spondylitis Metrology Index (UCOASMI), based on an automated motion analysis. Structural damage was measured by the modified Stoke Ankylosing Spondylitis Spine Score (mSASSS), and activity by the Ankylosing Spondylitis Disease Activity Score (ASDAS) and the Bath Ankylosing Spondylitis Disease Activity (BASDAI). We analyzed the correlations between variables, as well as interaction by multiple linear regression models to reach a predictive equation. Results Fifty AS patients, mainly men in their mid‐40s and with moderate levels of disease activity and structural damage, were included in the study. BASMI and UCOASMI scores showed a strong correlation (r = 0.89). UCOASMI scores correlated stronger than BASMI with structural damage (r = 0.72 versus r = 0.67) and patient's age (r = 0.68 versus r = 0.56). Correlations of mobility were weaker with disease activity by the ASDAS (r = 0.38) and BASDAI (r = 0.49), and disease duration (r = 0.40). Multiple linear regression showed that factors associated to mobility by UCOASMI were age, the BASDAI, mSASSS, ASDAS (0:15 years. The largest weight in the equation corresponded to the mSASSS. The association between the ASDAS and UCOASMI is dependent on disease duration. Conclusion Mobility in AS is influenced by both structural damage and activity, but definitely also by age and disease duration. Improved mobility should be a relevant target in AS, even more prominently than activity, given its closer relation to structural damage.
ISSN:2151-464X
2151-4658
DOI:10.1002/acr.22400