• Mari Kuisma, Jaro Karppinen, Jaakko Niinimäki, Mauno Kurunlahti, Marianne Haapea, Heikki Vanharanta, and Osmo Tervonen.
• Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland. mari.kuisma@fimnet.fi
• Spine. 2006 Jul 1; 31 (15): 1714-8.

Study DesignA longitudinal follow-up of Modic changes on magnetic resonance imaging (MRI).ObjectivesTo assess the prevalence and natural course Modic changes over a 3-year follow-up period.Summary Of Background DataModic changes are bone marrow and endplate lesions visible on MRI. To the authors' knowledge, no follow-up studies on their natural course have been published.MethodsThe study population consisted of 60 unoperated sciatica patients 23 to 76 years of age. Baseline and 3-year lumbar MR images from L1-L2 through L5-S1 were analyzed independently by 2 radiologists and a consensus reading was performed.ResultsAt baseline, the prevalence of Modic changes was 23%. Seven discs had mixed Type I/II, and 63 Type II change. Changes typically occurred at L4-L5 and L5-S1, and associated positively with age (P = 0.009). Ten of 70 discs (14%) with Modic changes at baseline displayed another type at 3 years. Furthermore, the nonconverted changes increased significantly in size. The incidence of new Modic changes during the follow-up was 6% (13 of 230).ConclusionsModic changes are common MRI findings in patients with degenerative lumbar disc disease. We found evidence that Modic Type II changes may be less stable than previously assumed.

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