TY - JOUR
T1 - Both structural damage and inflammation of the spine contribute to impairment of spinal mobility in patients with ankylosing spondylitis
AU - Machado, Pedro
AU - Landewe, Robert
AU - Braun, Juergen
AU - Hermann, Kay-Geert A.
AU - Baker, Daniel
AU - van der Heijde, Desiree
PY - 2010/8
Y1 - 2010/8
N2 - Objective To study the relationship between spinal mobility, radiographic damage of the spine and spinal inflammation as assessed by MRI in patients with ankylosing spondylitis (AS). Methods In this subanalysis of the Ankylosing Spondylitis Study for the Evaluation of Recombinant Infliximab Therapy cohort, 214 patients, representing an 80% random sample, were investigated. Only baseline data were used. MRI inflammation was assessed by the AS spinal MRI activity (ASspiMRI-a) score, structural damage by the modified Stoke AS Spine Score (mSASSS) and spinal mobility by the linear definition of the Bath Ankylosing Spondylitis Metrology Index (BASMI). Univariate correlations were calculated on baseline values using Spearman rank correlation. Independent associations between the variables of interest were investigated by multivariate linear regression analysis. Associations with clinical disease activity, C-reactive protein, disease duration, age, gender, body mass index and HLA-B27 status were also investigated. Subanalyses were performed according to disease duration. Results BASMI correlated moderately well with mSASSS (Spearman's rho = 0.6) and weakly with ASspiMRI-a (rho = 0.3). A best-fit model for BASMI included both mSASSS (regression coefficient (B) = 0.865, p <0.001) and ASspiMRI-a (B = 0.236, p = 0.018). In patients with a disease duration = 3 years, B was greater for ASspiMRI-a than for mSASSS (0.595 vs 0.380), while in patients with a disease duration >3 years B was greater for mSASSS than for ASspiMRI-a (0.924 vs 0.156). Conclusion Spinal mobility impairment in AS is independently determined both by irreversible spinal damage and by reversible spinal inflammation. Spinal mobility impairment is more influenced by spinal inflammation in early disease, and by structural damage in later disease.
AB - Objective To study the relationship between spinal mobility, radiographic damage of the spine and spinal inflammation as assessed by MRI in patients with ankylosing spondylitis (AS). Methods In this subanalysis of the Ankylosing Spondylitis Study for the Evaluation of Recombinant Infliximab Therapy cohort, 214 patients, representing an 80% random sample, were investigated. Only baseline data were used. MRI inflammation was assessed by the AS spinal MRI activity (ASspiMRI-a) score, structural damage by the modified Stoke AS Spine Score (mSASSS) and spinal mobility by the linear definition of the Bath Ankylosing Spondylitis Metrology Index (BASMI). Univariate correlations were calculated on baseline values using Spearman rank correlation. Independent associations between the variables of interest were investigated by multivariate linear regression analysis. Associations with clinical disease activity, C-reactive protein, disease duration, age, gender, body mass index and HLA-B27 status were also investigated. Subanalyses were performed according to disease duration. Results BASMI correlated moderately well with mSASSS (Spearman's rho = 0.6) and weakly with ASspiMRI-a (rho = 0.3). A best-fit model for BASMI included both mSASSS (regression coefficient (B) = 0.865, p <0.001) and ASspiMRI-a (B = 0.236, p = 0.018). In patients with a disease duration = 3 years, B was greater for ASspiMRI-a than for mSASSS (0.595 vs 0.380), while in patients with a disease duration >3 years B was greater for mSASSS than for ASspiMRI-a (0.924 vs 0.156). Conclusion Spinal mobility impairment in AS is independently determined both by irreversible spinal damage and by reversible spinal inflammation. Spinal mobility impairment is more influenced by spinal inflammation in early disease, and by structural damage in later disease.
U2 - 10.1136/ard.2009.124206
DO - 10.1136/ard.2009.124206
M3 - Article
C2 - 20498215
SN - 0003-4967
VL - 69
SP - 1465
EP - 1470
JO - Annals of the Rheumatic Diseases
JF - Annals of the Rheumatic Diseases
IS - 8
ER -