Kazuto Miura, Osamu Morita, Toru Hirano, Kei Watanabe, Jun’ichi Fujisawa, Naoki Kondo, Takahiro Netsu, Tadamasa Hanyu, Yugo Shobugawa, Naoto Endo


March 2019, pp 1 - 7 Original Article Read Full Article 10.1007/s00586-019-05938-x

First Online: 08 March 2019

Purpose

To investigate the prevalence of and factors associated with dysfunctional low back pain (LBP) in patients with rheumatoid arthritis (RA).

Methods

This cross-sectional study included 1276 RA outpatients from two hospitals. The Roland–Morris Disability Questionnaire was used to address the functional–dysfunctional state criterion. Clinical variables, such as medical status, disease activity, bone mineral density, and spinopelvic alignment parameters, were compared between patients with and without dysfunctional LBP.

Results

Mean age and disease duration were 64.6 and 13.4 years, respectively; the prevalence of dysfunctional LBP was 32.8%. On univariate analysis, significant differences existed in many variables, except sex, body weight, C-reactive protein (CRP) level, and prevalence of biological agent users, between patients with and without dysfunctional LBP. Multivariate logistic regression analysis revealed body mass index (BMI; odds ratio [OR], 1.116; P 

Conclusion

The factors associated with dysfunctional LBP in patients with RA were more vertebral fractures, higher DAS-28CRP, vertebral endplate and/or facet erosion, higher BMI, longer disease duration, greater PT, older onset age, greater SVA, and less MTX use. Strictly controlling patients’ body weight and disease activity with MTX and avoiding spinopelvic malalignment through vertebral fracture prevention are important.

Graphical abstract

These slides can be retrieved under Electronic Supplementary Material. [Figure not available: see fulltext.]


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