Explore On The Relationship Between The Lumbar Disc Herniation And The Change In Paraspinal Muscle Cross-sectional Area

Objective:To investigate the relationship between lumbar disc herniation(LDH) and balance/symmetry in paraspinal muscle cross-sectional area(CSA).Methods:82patients with LDH were screened from April2012to August2013as LDH group,meanwhile81health persons with no lumbar spinal degeneration were selected as control group.The cross-sectional area(CSA) of the bilateral paraspinal muscles at the L3,L4and Ls inferior border of the vertebral body levels were measured using Image J software.Muscle CSA asymmetry was determined with the equation’[(larger-smaller)/larger]×100’.Muscle CSA proportion imbalance was determined with the equation’low back extensor muscle (erector spinae plus mutifidus muscle) CSA/ipsilateral psoas CSA’.In order to exclude interference experiment because of different daily handedness between LDH group and control group,using equation ’bilateral low back extensor muscle CSA/bilateral psoas CSA’further observe balance changes of muscle CSA.ResuIts:The asymmetry of low back extensor muscle between LDH group and control group was significance only at L4(P=0.0448).There were all no statistical difference between LDH group and control group in the asymmetry of psoas CSA and in the proportion of low back extensor muscle CSA to psoas muscle CSA at three lowest levels(P>0.05).Conclusion:It is uncertain that bilateral paraspinal muscle CSA in patients with LDH have asymmetry changes,but secondary scoliosis caused by LDH may induce bilateral low back extensor muscle CSA asymmetry change.Proportion of low back extensor muscle CSA to psoas muscle CSA in patients with LDH have no imbalance. According to our study,the lumbar disc herniation interaction with the change in paraspinal muscle cross-sectional area will take a more systematic study.