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Introduction Low back pain (LBP) is defined as pain in the area on the posterior aspect of the body from the lower margin of the twelfth ribs to the lower gluteal folds with or without pain referred into one or both lower limbs that lasts for at least one day [1]. A study, a systematic review of the global prevalence of low back pain including general population studies between 1980 and 2009 (A total of 165 studies from 54 countries) was published. The mean point prevalence was 18.3%, and lifetime prevalence was 38.9% [2]. LBP is the most debilitating condition, and can lead to decreased physical function, compromised quality of life, and psychological distress [3]. Several studies have been conducted to recognize the risk factors of LBP. In one study, the authors systematically searched the Medline (National Library of Medicine, Bethesda, Maryland) and Embase (Elsevier, Amsterdam, the Netherlands) databases until May 2009, and 95 studies were reviewed, and 33 studies were included in the meta-analyses. In cross-sectional studies, obesity was associated with increased prevalence of low back pain in the past 12 months (pooled odds ratio (OR)=1.33), seeking care for low back pain (OR=1.56), and chronic low back pain (OR=1.43) [4]. Despite of strong relationship between obesity and LBP, the underlying mechanisms are unclear. A number of studies have focused on examining the relationship between obesity and structures of the spine, in particular the lumbar disc. Several studies have been directed to identify the relationship between obesity and disc height and disc herniation, some of them have examined disc height at a single lumbar disc level [5], others have reported aggregate measures at levels from L1 to L4 [6,7]. However, no study to date has examined the effect of high body mass index (BMI) on disc height at different levels of lumbar spine [8]. The studies about disc herniation are similar. Moreover, in majority of these studies, occupational risk factors are ignored. The aim of this study is to evaluate the association between obesity/overweight and disc height and disc bulging at each level and total levels in lumbar vertebra, considering occupational risk factor. D ow nl oa de d fr om ir jn s. or g at 1 5: 56 + 03 30 o n T hu rs da y N ov em be r 2n d 20 17 [ D O I: 10 .1 88 69 /a ca dp ub .ir jn s. 2. 3. 11 ]

Concomitance of Obesity and Overweight with Disc Height and Disc Herniation in Lumbar Spine