Mechanism Of Stress And Strain Of Lumbar Intervertebral Disc Based On The Effect Of Lever-Positioning Manipulation On Neural Feedback Control

Purpose In this study,from the perspective of neural feedback control,the finite element method is used in this paper to analyze the stress-strain mechanism of lever-positioning manipulation impact on lumbar intervertebral disc.Methods 1.20 healthy New Zealand rabbits with half males and half females are Selected and randomly using the number table in turn numbered,the rabbits are divided into the lever-positioning group and the thenar-kneading group,these different groups are loaded by lever-positioning manipulation and thenar-kneading manipulation respectively.The displacement and pressure spectrum of above two methods are accessed through the application of biomechanical acquisition and processing system,and then data processing by screening,storage and filtering.2.The spinal cord injury model is built by spinal cord disruption for eliminating the effects of bioelectricity on the waist muscle.The rabbits are treated with lever-positioning manipulation and thenar-kneading manipulaiton.The pressure and displacement data of above two methods are obtained by the application of biomechanical acquisition and processing system.3.The biomechanical parameters(displacement ? and pressure F)are obtained by the calculation of the finite element biomechanical model of the rabbit lumbar spine.The parameters are calculated and analyzed,and the geometry is divided into the finite element model.Then the finite element equation is used to calculate the elastic modulus E,Poisson's ratio v,the relationship of force and displacement of muscle is analyzed by the establishment of the constraints of lever-positioning manipulaiton and thenar-kneading manipulation.Then the statistical Z test of material parameters is analyzed.The differences of the mechanical structure of the lumbar discs between before spinal cord transaction and after spinal cord transaction are compared from the point of view of material engineering.The impact of neural control on lever-positioning manipulation is analyzed by the statistical Z test.Results 1.After biomechanical experimental test and finite element analysis.In the same force load condition,to those rabbits with spinal cord injuries,lever-positioning manipulation,it's found that the lumbar disc displacement is larger than the thenar-kneading method.The relative displacement of the lumbar disc is increasing as a result of lever-positioning or thenar-kneading processes.The displacement is transmitted from the outer edge of the lumbar spine of the rabbit towards the muscle and intervertebral disc.2.The displacement value of the after spinal cord transaction is smaller than that of the model before spinal cord transaction,P = 0.02,the value is less than 0.05,which is statistically significant.3.The elastic modulus of the experimental group and the control group after spinal cord transaction is larger than that of the modulus before spinal cord transaction,P=0.03,and the value is less than 0.05,which is statistically significant.This proves that the stress and strain of the lumbar intervertebral discs under the action of the lever-positioning technique is positive.4.The Poisson's ratio of the experimental group and the control group after spinal cord transaction is larger than that of the Poisson's ratio before spinal cord transaction,P<0.001,and its value is less than 0.05,which is statistically significant.What can also be reflected from the side of the spinal nerve plexus within the lever under the action of the role of the rabbit lumbar disc stress and strain is positive.Conclusion 1.The feedback effect of nerve on the biomechanical properties of the lumbar intervertebral disc under the action of the lever-positioning force is existed.It can increase the stiffness of the lumbar intervertebral disc tissue in rabbits,this is neural feedback,which is the reason of resistance force occurs when the lever-positioning manipulation is applied.2.After the model is established,the lumbar intervertebral disc of the rabbits lose the function of neural feedback.Under the action of lever-posioning manipulation,the lumbar disc tissue of rabbits is more prone to lateral deformation.In fact,lateral displacement does not mainly play a role in the adjustment of lumbar intervertebral disc,we can see no neural feedback to achieve the treatment of lumbar disc herniation effect is more difficult.3.The Poisson's ratio of the experimental group and the control group after spinal cord transaction is larger than that of the Poisson's ratio before spinal cord transaction,and it reflects the positive effect of the lumbar spinal nerve on the lumbar intervertebral disc.And lumbar disc displacement of the role of lever-positioning manipulation is larger than thenar-kneading manipulation,which shows that the lever-positioning manipulation treatment effect is more significant than thenar-kneading manipulation.