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Abstract Number: 634

Spinal Mobility Measures Allow Discrimination of Subgroups of Different Activity and Severity in Early Axial Spondyloarthritis

Mary Lucy Marques1,2, Sofia Ramiro2,3, Floris van Gaalen2, Philippe Goupille4, Maxime Dougados5 and Désirée van der Heijde6, 1Rheumatology, Centro Hospitalar e Universitário de Coimbra, Portugal & Leiden University Medical Center, Leiden, Netherlands, 2Rheumatology, Leiden University Medical Center, Leiden, Netherlands, 3Zuyderland Medical Center, Heerlen & Leiden University Medical Center, Leiden, Netherlands, 4Université François-Rabelais, Tours, France, 5Department of Rheumatology, Paris Descartes University and Cochin Hospital, Paris, France, 6Leiden University Medical Centre, Leiden, Netherlands

Meeting: 2018 ACR/ARHP Annual Meeting

Keywords: outcome measures and spondylarthritis

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Session Information

Date: Sunday, October 21, 2018

Session Title: Spondyloarthritis Including Psoriatic Arthritis – Clinical Poster I: Imaging, Clinical Studies, and Treatment

Session Type: ACR Poster Session A

Session Time: 9:00AM-11:00AM

Background/Purpose: Spinal mobility has been mostly investigated in cohorts of patients with established AS. However, it was scarcely studied in the early phases of the disease and how the impairment in mobility across different measures behaves as compared to normal subjects. The purpose of this study was to investigate 1) which spinal mobility measures (SMMs) are most frequently impaired and in which order; 2) which SMMs are most discriminative of activity and severity in early axial Spondyloarthritis (axSpA).

Methods: All SMM measurements of patients from the DESIR (5-year data) and SPACE (data from Leiden University Medical Center, 2.6 (1.9) years of follow-up) cohorts and with a clinical diagnosis of axSpA (level of confidence ≥7/10) were analyzed. SMMs were considered impaired when falling below pre-defined cut-offs, derived from normal individuals1. The proportion of patients with each of the SMMs impaired was calculated, for both baseline and all observations. The BASMI, being a composite index, was not considered in the ranking of impairment of spinal mobility and only the level of impairment is presented. The same analysis was conducted in subgroups to contrast patient and disease characteristics potentially influencing spinal mobility, like treatment with biologics (ever/never), disease activity (with/without low disease activity over time, i.e., ASDAS<2.1 in ≥2/3 of visits) and the presence of baseline syndesmophytes (yes/no).

Results: We included 328 (54% males, mean (SD) age of 32 (8) years) and 148 (64% females, mean (SD) age of 30 (9) years) patients from the DESIR and SPACE cohorts, respectively. No strict and fixed order of impairment in SMMs was seen in both cohorts. Considering patients in whom all SMMs were assessed, in DESIR, the most frequently impaired SMM (below 2.5th percentile) was mSchober (42%), followed by Lateral Spinal Flexion (LSF; 37%), Tragus-to-wall (16%), Cervical rotation (16%) and Chest expansion (11%). In SPACE, the order of impairment was: LSF (36%), mSchober (14%), Chest expansion (13%), Cervical rotation (11%) and Tragus-to-wall (3%). LSF and mSchober captured the majority of patients with ≥ 1 SMM impaired (86% and 78% for DESIR and SPACE, respectively). LSF and BASMI best discriminated between subgroups of patients, with higher impairment in patients ever treated with biologics, with higher disease activity and presence of baseline syndesmophytes (Table 1, data from DESIR). Similar results were obtained in the SPACE cohort.

Conclusion: LSF and mSchober are the most impaired SMMs, together allowing the identification of the majority of patients with impaired spinal mobility in early axSpA. LSF and BASMI discriminate best between subgroups of patients, reflecting a worse spinal mobility in patients with more active and severe disease.

1Ramiro S et al. Ann Rheum Dis. 2015 Jun;74(6):1218-24.


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Disclosure: M. L. Marques, None; S. Ramiro, None; F. van Gaalen, None; P. Goupille, None; M. Dougados, None; D. van der Heijde, None.

To cite this abstract in AMA style:

Marques ML, Ramiro S, van Gaalen F, Goupille P, Dougados M, van der Heijde D. Spinal Mobility Measures Allow Discrimination of Subgroups of Different Activity and Severity in Early Axial Spondyloarthritis [abstract]. Arthritis Rheumatol. 2018; 70 (suppl 10). https://acrabstracts.org/abstract/spinal-mobility-measures-allow-discrimination-of-subgroups-of-different-activity-and-severity-in-early-axial-spondyloarthritis/. Accessed May 19, 2022.
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