Abstract
Background: There is no specific cause of low back pain for eighty- five percent of cases and they were classified as non-specific low back pain. In this study, the size and symmetry of the lumbar multifidus muscles in industrial workers with non-specific chronic low back pain and healthy workers were investigated. Materials and Methods: In a cross-sectional comparative study, sixty industrial workers were divided into two groups of chronic low back pain and healthy, based on medical history and physical test. Roland-Morris Low Back Pain Questionnaire were filled by the group with chronic low back pain and dimensions of lumbar multifidus muscles in the L4-L5 level were measured by ultrasonography and the atrophy and asymmetry of two sides were examined. Results: Average size of right muscle in patients ranged between 2.5 and 4.3 CM? Inch? with average of 3.6 ± 0.43 and size of left muscle was in the range of 2.8 to 4.7 with the average of 3.9 ± 0.46. Size of right Muscle in healthy group was between 3.6 and 4.9 with the average of 4.3 ± 0.4 and left muscle size in healthy group was in the range of 3.9 to 5.09 and average of 4.4 ± 0.42 (p< 0.001). The proportion of symmetry, in the patient group was less (0.9) compared to those with no symptoms (0.95) (p<0.001). Conclusion: This study showed that the size of the multifidus muscle in patients with chronic non-specific low back pain at L4-L5 level was smaller compared to without back pain subjects on the basis of the average size of right and left muscle. Besides, in the patient group, muscle size in one side was smaller than the other side, in a way that there was a clearly and significantly asymmetry in muscle size between both sides.in addition, difference between size was observed between the two left and right waist size in the healthy group.
Highlights
Low Back pain is one of the most common musculoskeletal disorders in individuals under 65 years, so that it is the most common cause of activity limitation in people younger than 45 years (1 .(Sixty to eighty percent of adults are suffering from this disorder during their lifetime (2, 3(. it has been suggested 90 % of people experience back pain in their lifetime. [4]It is likely to state that low back pain is the most common human disease after common cold and it is the second most common cause of doctor visit (5 .(In people aged between 45 and 65 years, low back pain (LBP) is the third degree after heart disease and rheumatoid arthritis
Patients with chronic low back pain are 73 to 77 percent of patients suffering from the waist disorders that in 85% of them, no specific cause have been found for low back pain [13, 14] and classified as nonspecific low back pain [15]
The results showed that the size and contraction of multifidus muscle in the L5 vertebra in patients with chronic low back pain was significantly smaller than the healthy group [19]
Summary
Low Back pain is one of the most common musculoskeletal disorders in individuals under 65 years, so that it is the most common cause of activity limitation in people younger than 45 years (1 .(Sixty to eighty percent of adults are suffering from this disorder during their lifetime (2, 3(. it has been suggested 90 % of people experience back pain in their lifetime. [4]It is likely to state that low back pain is the most common human disease after common cold and it is the second most common cause of doctor visit (5 .(In people aged between 45 and 65 years, low back pain (LBP) is the third degree after heart disease and rheumatoid arthritis. Patients with chronic low back pain are 73 to 77 percent of patients suffering from the waist disorders that in 85% of them, no specific cause have been found for low back pain [13, 14] and classified as nonspecific low back pain [15]. The size and symmetry of the lumbar multifidus muscles in industrial workers with non-specific chronic low back pain and healthy workers were investigated. Conclusion: This study showed that the size of the multifidus muscle in patients with chronic non-specific low back pain at L4-L5 level was smaller compared to without back pain subjects on the basis of the average size of right and left muscle. In the patient group, Keywords: Ultr asound, multifidus muscle, non-specific chronic low back pain
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