• Ole K Jensen, Morten H Andersen, René D Østgård, Niels T Andersen, and Nanna Rolving.
• Spine Center, Research Unit, University Research Clinic for Innovative Patient Pathways, Silkeborg Regional Hospital, Silkeborg, Denmark.
• Eur Spine J. 2019 Nov 1; 28 (11): 2478-2486.

PurposeTo investigate whether treatment by lactic acid bacteria for 100 days is associated with change of disability and pain in chronic low back pain (CLBP) patients with type 1 or mixed Modic changes (MC) during 1-year follow-up.MethodsEighty-nine patients with CLBP and type 1 MC or mixed MC were randomized to receive either one capsule Lactobacillus Rhamnosis GG (6 billion colony-forming unit per capsule) twice daily or placebo capsules for 100 days.ResultsMissing values at 1 year were 4% and 3% in the disability and pain variables, respectively. The predefined outcomes disability and back + leg pain only changed little during follow-up with no statistically significant differences between groups. At 1 year, back pain had on average decreased by 1.1 more on a 0-10 scale (95% confidence interval 0.20-1.97) in the group treated by lactic acid bacteria than in the control group. There were no differences regarding other predefined outcomes, i.e. global effect or percentage with minimal disability at 1 year. Nine per cent of the patients reported gastrointestinal side effects without difference between groups.ConclusionsNo differences were found regarding the predefined outcomes. Overall, there was little improvement during the 1-year observation period. A small, though hardly clinically relevant, effect on back pain was seen after treatment by Lactobacillus Rhamnosis GG, and the treatment was without side effects in comparison with the control group.

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