Influence of central sensitivity syndrome on symptoms of chronic nonspecific low back pain in patients with spinal osteoarthritis

Objective. To evaluate the influence of central sensitivity syndrome (CSS) on symptoms of chronic nonspecific low back pain (LBP) in patients with spinal osteoarthritis. Material and methods. Patients with chronic nonspecific LBP (n=120) and spinal osteoarthritis (OA) were divided into two equal groups (n=60). The 1st group included patients with clinically insignificant CSS (CSI score <35). The 2nd group included patients with clinically significant CSS (CSI score ≥35). Both groups were compared regarding duration of disease and exacerbation; LBP intensity; degree of disability; risk of LBP chronicity; number of descriptors of various painful sensations and associated affective reactions. Results. Both groups were comparable regarding anthropometric parameters; duration of disease and exacerbation; back and leg pain intensity. The following parameters (median) were lower in the 1st group: total CSI score (22 vs 47 points); disability according to the Roland-Morris Disability Questionnaire (10 vs 13.5 points); risk of chronicity according to the Keele STarT Back Tool (4 vs 7 points); SF-MPQ-2 total score (41 vs 67 points). Patients in the 2nd group often complained on symptoms typical for chronic fatigue syndrome, fibromyalgia, and clinical depression. Conclusion. Central sensitivity syndrome limits daily activities of patients with chronic low back pain and exacerbates its course. Patients with chronic low back pain and clinically significant central sensitivity syndrome predominantly demonstrate symptoms typical for chronic fatigue syndrome, fibromyalgia, and depression. In such cases, low back pain may be one of the symptoms of these conditions.