Abstract
Objective
To examine whether Modic changes influence pain during a 1-year follow-up in patients with lumbar radicular pain.
Materials and Methods
A total of 243 patients with lumbar radicular pain due to disc herniation were recruited from two hospitals in Norway and followed up at 6 weeks, 6 months, and 12 months. On baseline lumbar magnetic resonance images, two observers independently evaluated Modic changes (types I–III; craniocaudal size 0–3). Outcomes were sensory pain (McGill Pain Questionnaire), back and leg pain (visual analogue scale, VAS). Association between Modic type and outcomes was explored with a mixed model and then by two-way analysis of variance (ANOVA) at each time point with Modic and treatment groups (surgical, n = 126; nonsurgical, n = 117) as fixed factors, adjusted for disc degeneration, age, sex, smoking, and duration of radicular pain. Modic size was also analyzed using ANOVA.
Results
Pain scores had decreased significantly at 1-year follow-up. Modic type was significantly related to McGill sensory scores (mixed model: p = 0.014–0.026; ANOVA: p = 0.007 at 6 weeks), but not to VAS back pain or VAS leg pain scores. At 6 weeks, the mean McGill sensory score was higher in Modic I than in Modic II–III patients (p = 0.003) and in patients without Modic changes (p = 0.018). Modic size L1–S1 was not associated with pain outcomes.
Conclusion
Patients with lumbar radicular pain have a substantial pain reduction during 1-year follow-up, but Modic type I changes may imply a slower initial decrease in sensory pain.
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Acknowledgements
The study received financial support from the South Eastern Norway Regional Health Authority, the Western Norway Regional Health Authority, Haakon and Sigrun Ødegaard’s Fund at the Norwegian Society of Radiology, the Norwegian Research Council, and the Norwegian Extra Foundation for Health and Rehabilitation through the Norwegian Back Pain Association. We thank Anette Storesund for help with data collection and Leiv Sandvik for statistical advice.
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The authors declare that they have no conflict of interest.
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Schistad, E.I., Espeland, A., Rygh, L.J. et al. The association between Modic changes and pain during 1-year follow-up in patients with lumbar radicular pain. Skeletal Radiol 43, 1271–1279 (2014). https://doi.org/10.1007/s00256-014-1928-0
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DOI: https://doi.org/10.1007/s00256-014-1928-0