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KMID : 0361420110350060852
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Journal of Korean Academy of Rehabilitation Medicine
2011 Volume.35 No. 6 p.852 ~ p.859
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Association between Cross-sectional Areas of Lumbar Muscles on Magnetic Resonance Imaging and Chronicity of Low Back Pain
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Lee Hak-Il
Song Jun-Young
Lee Hee-Song
Kang Jin-Young
Kim Min-Young
Ryu Ju-Seok
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Abstract
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Objective: To investigate the prognostic value of cross-sectional areas (CSA) of paraspinal (multifi dus and erector spinae) and psoas muscles on magnetic resonance imaging (MRI) in chronicity of low back pain.
Method: Thirty-eight subjects who visited our hospital for acute low back pain were enrolled. Review of their medical records and telephone interviews were done. Subjects were divided into two groups; chronic back pain group (CBP) and a group showing improvement within 6 months after onset of pain (IBP). Th e CSA of paraspinal and psoas muscles were obtained at the level of the lower margin of L3 and L5 vertebrae using MRI.
Results: CSA of erector spinae muscle and the proportion of the area to lumbar muscles (paraspinal and psoas muscles) at L5 level in the CBP group were significantly smaller than that of the IBP group (p<0.05). Th e mean value of CSA of multifidus muscle at L5 level in the CBP group was smaller than that of the IBP group, but was not statistically signifi cant (p>0.05). CSA of psoas muscle at L5 level and all values measured at L3 level were not significantly different between the groups (p>0.05).
Conclusion: CSA of erector spinae muscle at the lower lumbar level and the proportion of the area to the lumbar muscles at the L5 level can be considered to be prognostic factors of chronicity of low back pain.
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KEYWORD
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Low back pain, Magnetic resonance imaging, Cross-sectional area, Muscles
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