Abstract
Study design
Prospective longitudinal study.
Objective
To determine whether systemic cytokines and C-reactive protein (CRP) during an acute episode of low back pain (LBP) differ between individuals who did and did not recover by 6 months and to identify sub-groups based on patterns of inflammatory, psychological, and sleep features associated with recovery/non-recovery.
Summary of background data
Systemic inflammation is observed in chronic LBP and may contribute to the transition from acute to persistent LBP. Longitudinal studies are required to determine whether changes present early or develop over time. Psychological and/or sleep-related factors may be related.
Methods
Individuals within 2 weeks of onset of acute LBP (N = 109) and pain-free controls (N = 55) provided blood for assessment of CRP, tumor necrosis factor (TNF), interleukin-6 (IL-6) and interleukin-1β, and completed questionnaires related to pain, disability, sleep, and psychological status. LBP participants repeated measurements at 6 months. Biomarkers were compared between LBP and control participants at baseline, and in longitudinal (baseline/6 months) analysis, between unrecovered (≥pain and disability), partially recovered (reduced pain and/or disability) and recovered (no pain and disability) participants at 6 months. We assessed baseline patterns of inflammatory, psychological, sleep, and pain data using hierarchical clustering and related the clusters to recovery (% change in pain) at 6 months.
Results
CRP was higher in acute LBP than controls at baseline. In LBP, baseline CRP was higher in the recovered than non-recovered groups. Conversely, TNF was higher at both time-points in the non-recovered than recovered groups. Two sub-groups were identified that associated with more (“inflammatory/poor sleep”) or less (“high TNF/depression”) recovery.
Conclusions
This is the first evidence of a relationship between an “acute-phase” systemic inflammatory response and recovery at 6 months. High inflammation (CRP/IL-6) was associated with good recovery, but specific elevation of TNF, along with depressive symptoms, was associated with bad recovery. Depression and TNF may have a two-way relationship.
Graphical abstract
These slides can be retrieved under Electronic Supplementary Material.
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References
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Funding
This research was funded by the National Health and Medical Research Council (NHMRC) of Australia (Program Grant: ID631717; Project Grant ID631369). PWH supported by NHMRC Fellowship ID1002190. The manuscript submitted does not contain information about medical device(s)/drug(s).
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Klyne, D.M., Barbe, M.F., van den Hoorn, W. et al. ISSLS PRIZE IN CLINICAL SCIENCE 2018: longitudinal analysis of inflammatory, psychological, and sleep-related factors following an acute low back pain episode—the good, the bad, and the ugly. Eur Spine J 27, 763–777 (2018). https://doi.org/10.1007/s00586-018-5490-7
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DOI: https://doi.org/10.1007/s00586-018-5490-7