Spinal-pelvic orientation: Potential effect on the diagnosis of spondyloarthritis

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Abstract

Objective: To assess associations of spinal-pelvic orientation with clinical and imaging-study findings suggesting axial SpA (axSpA) in patients with recent-onset inflammatory back pain. Methods: Spinal-pelvic orientation was assessed in DESIR cohort patients with recent-onset inflammatory back pain and suspected axSpA, by using lateral lumbar-spine radiographs to categorize sacral horizontal angle (<40° vs ≥40°), lumbosacral angle (<15° vs ≥15°) and lumbar lordosis (LL, <50° vs ≥50°). Associations between these angle groups and variables collected at baseline and 2 years later were assessed using the χ2 test (or Fisher's exact) and the Mann-Whitney test. With Bonferroni's correction, P < 0.001 indicated significant differences. Results: Of 362 patients, 358, 356 and 357 had available sacral horizontal angle, lumbosacral angle and LL values, respectively; means were 39.3°, 14.6° and 53.0°, respectively. The prevalence of sacroiliitis on both radiographs and MRI was higher in the LL < 50° group than in the LL ≥50° group, but the difference was not statistically significant. Clinical presentation and confidence in a diagnosis of axSpA did not differ across angle groups. No significant differences were identified for degenerative changes according to sacral horizontal angle, lumbosacral angle or LL. Conclusion: Spinal-pelvic balance was not statistically associated with the clinical or imaging-study findings suggesting axSpA in patients with recent-onset inflammatory back pain.

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Alegria, G. C., Deloire, L., Herbette, M., Garrigues, F., Gossec, L., Simon, A., … Saraux, A. (2020). Spinal-pelvic orientation: Potential effect on the diagnosis of spondyloarthritis. Rheumatology (United Kingdom), 59(1), 84–89. https://doi.org/10.1093/rheumatology/kez240

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