Abstract
Introduction: Modic changes are vertebral endplate changes visible in magnetic resonance imaging (MRI), which associate with degenerative intervertebral disc disease. Twin studies suggest that intervertebral disc degeneration and low back pain may be primarily explained by genetic factors. There are, however, no studies on genetic factors in Modic changes.
Materials and methods: Eleven variations in eight genes (COL9A2, COL9A3, COL11A2, IL1A, IL1B, IL6, MMP-3 and VDR) were genotyped in an occupational cohort of 159 male train engineers and 69 male paper mill workers. All the study subjects were MRI scanned and evaluated for Modic changes.
Results: Out of 228 subjects studied, 128 (56%) were found to have Modic change at one or more disc levels. 15% of them had exclusively Modic type I while 32% had exclusively Modic II changes. 10% of the subjects had both type I and type II changes. When single nucleotide polymorphisms (SNPs) were analyzed independently, none of them significantly associated with Modic changes. However, when the gene-gene interactions were evaluated IL1A and MMP-3 polymorphisms together associated with type II Modic changes (OR 3.2, 95% CI 1.2–8.5; p = 0.038). Furthermore, IL-1 gene cluster together with MMP-3 polymorphism associated significantly with type II Modic changes (OR = 8.14, 95% CI 1.72–38.44; p = 0.008).
Discussion: This is the first study evaluating the role of genetic factors in relation to Modic changes. Genetic variations in IL-1 cluster and MMP-3 gene were found together to associate significantly with type II Modic changes.
Correspondence should be addressed to Mr J. O’Dowd, Honorary Secretary at SBPR c/o BOA, Royal College of Surgeons, 35–43 Lincoln’s Inn Fields, London, WC2A 3PE.
