Objective: To correlate low back pain caused by fatty degeneration, visualized by magnetic resonance imaging (MRI), with sex and age. Methods: With a timeframe of 2015 to 2020, data on sex and age of fifty symptomatic patients with low back pain were collected from medical records and correlated with MRI analyses showing the occurrence of fatty infiltration in the paraspinal and erector muscles. Three trained observers, using the classification of Goutallier et al. (1994), analyzed five lumbar levels and the degree of injury. The Kolmogorov-Smirnov, Shapiro Wilk, Student's t, Mann-Whitney and Spearman correlation tests were used, all with a 5% significance level. Results: Among the cases, the L5-S1 level was found in all the images, with a prevalence of 46% of grades 1 and 2 and 24% in the five lumbar levels. Severity was present in a small portion (8%) of the injuries. There was a predominance of 78% women, with significantly more severe injuries in relation to the number of levels (p < 0.001) and injuries of a higher degree (p < 0.001). The age range was 14 to 38 years (mean = 26.70 ± 5.70 years), showing a significant and moderate correlation between the number of levels reached and a greater degree of degeneration (p < 0.001). Conclusion: Fatty degeneration as a cause of low back pain was significantly more severe in women in terms to the number of levels and the higher degree of injury. The number of levels and the severity of fatty degeneration were not correlated with the patient's age. Level of evidence II; Retrospective Study.
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