• Charlotte Leboeuf-Yde, Krüger JensenRikkeRResearch Department, Spine Centre of Southern Denmark, Hospital Lillebaelt, Østre Hougvej 55, DK- 5500, Middelfart, Denmark. rikke.kruger.jensen@rsyd.dk.Institute of Regional Health Services Research, University of Southern Denmark, Mid, and Niels Wedderkopp.
• Research Department, Spine Centre of Southern Denmark, Hospital Lillebaelt, Østre Hougvej 55, DK- 5500, Middelfart, Denmark. clyde@health.sdu.dk.
• Bmc Musculoskel Dis. 2015 Oct 15; 16: 299.

BackgroundA previous study has suggested that it is uncommon for patients with chronic bothersome low back pain (LBP), who consult the secondary health care sector, to report at least four consecutive weeks without such bothersome pain in 1 year. It is not yet known, however, how many days of the week they experience pain throughout the year.MethodThe current study analyzed data collected in two randomized clinical studies conducted in 2007-9 on patients with back pain (Study 1 and 2). Study participants were patients with LBP for more than 2 months, one group with MRI-defined Modic changes (Study 1) and the other without any pathological explanation for the pain (Study 2). In both studies, participants were followed over 1 year with weekly automated text messages (SMS-Track). Each week they reported the number of days they had experienced bothersome LBP (0-7 days). The number of weeks with 7 days of bothersome LBP was calculated for both study groups. As baseline and outcome characteristics were similar between the intervention and control groups in each study, the data from treatment and control groups in each study were analyzed together, regardless of treatment allocation and the results compared between the two study samples.ResultsThe proportion of patients reporting bothersome LBP all days of the week ranged from 0 to 100 %, with the findings arranged in a U-shaped curve. The pain frequency patterns were remarkably similar for the two study samples. At one extreme, 31 % of participants reported 0-10 % of weeks with daily LBP. At the other extreme, 25 % of participants reported 91-100 % of weeks with daily LBP. The distribution between these values was also very similar for the two groups.ConclusionThis study revealed there to be considerable variation in weekly persistence of symptoms during 1 year in patients from the secondary care sector with chronic LBP. The results range from bothersome pain each day of the week, every week of the year, to no weeks at all with 7 days of pain. Interestingly, this pattern is near-identical in the two study samples; those with non-specific LBP and those with LBP and Modic changes. This heterogeneic pain profile in patients with chronic LBP deserves to be further investigated.

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