Correlation study between the fatty infiltration rate and some lumbar diseases

Abstract Background The aim of this study was to measuring the data of the cross-sectional area(CSA)of normal people and some patients with lumbar diseases,and to explore the correlation of the change of paravertebral muscles CSA, the fat infiltration rate༈FIR) of paravertebral muscles and some lumbar diseases. Methods Their lumbar magnetic resonance imaging(MRI )was obtained from L3 to L5, and the upper endplate, intervertebral disc and lower endplate were three planes respectively, a total of 9 planes. Image J software was used to measure the area of left and right erector spinae, left and right psoas major muscles, left and right multifidus muscles and fat infiltration area. A total of three people were measured at the same time, each site was measured 3 times, and the average paravertebral muscle area and the average fat infiltration were calculated. The patients were investigated by questionnaire and tested. Result The FIR of the normal female paraspinal muscle was significantly higher than that of the normal male group (P < 0.05). In the three experimental groups: the FIR of the male multifidus muscle was higher than that of the psoas major muscle and the erector spinae muscle (P < 0.05);There was a linear positive correlation between the FIR of paraspinal muscles and age.Compared with normal people, patients with LDH and LBP had significantly increased paravertebral muscle FIR (P < 0.05).In the LDH group and LBP group: There was a linear positive correlation between VAS score, ODI score and FIR. Liking sweets and high-fat foods, exercising, hyperlipidemia, calcium deficiency and age were correlated with the FIR of paravertebral muscle(P < 0.05). Conclusion The total FIR in female in the normal group was higher than that in male. With the increase of age, the paravertebral muscle FIR also increased. The FIR of multifidus muscle of some patients with lumbar diseases was greater than that of psoas major muscle and erector spinae muscle; The total FIR was higher than that in normal group. The higher the pain, the higher the FIR. Liking sweets foods, liking exercise, and so on were related to the FIR.