The Effect Of Stress That Spinal Manipulation Bed Stimulates South Shaolin Daogaijinbei Manipulation On Normal Lumbar Spine

ObjectiveThree-dimensional finite element analysis was used to observe the biomechanical effect of Spinal Manipulation Bed simulates South Shaolin Daogaijinbei manipulation on L1-L5 segments of normal lumbar spine at different pushing heights.To provide objective basis for the clinical application of Spinal Manipulation Bed simulates south Shaolin Daogaijinbei manipulation.Methods1.Obtain pushing height parameters:Using DR machine(Toshiba,Japan)to obtain lumbar lateral radiographs with neutral position and maximum extension position,and the displacement of L3 was measured to be about 10 cm.2.Establish model:Using the 16-slice spiral CT(Siemens,Germany)to obtain of a male healthy volunteer T12-S1 segment CT images,establish L1-L5 segment three-dimensional finite element model.Using finite element software such as Mimics 16.0,Geomagic Studio 2014,Hypermesh 13.0,MSC.Patran 2012 to establish a three-dimensional finite element model of normal lumbar spine.3.Validate model:A vertical load of 400 N and a torque of 10 N m were applied to the upper surface of L1 vertebral body,simulated flexion,extension,left and right lateral bending,and left and right rotations,and measurement of lumbar activity under different conditions.Compare the calculated results with the results of the published results to verify the accuracy and validity of the lumbar spine finite element model.4.Biomechanical analysis:According to the characteristics of Spine Manipulation Bed in simulating South Shaolin Daogaijinbei manipulation,a load of 100 N was applied perpendicular to L3 spinous process,and 11 kinds of pushing heights(0cm,1cm,2cm,3cm...10cm)were simulated on the verified finite element model.Using MSC.Nastran 2012 software to calculate the Von Misses stress and distribution of the normal vertebral body,vertebral facet joint,intervertebral disc,and anterior longitudinal ligament under different pushing heights.Results1.The normal lumbar spine finite element model were established by our study included 59,172 nodes and 275,652 units.The Tet4 elements were used for the vertebral body,intervertebral joints,annulus fibrosus and nucleus pulposus models,the spring cells are used for the ligaments.All the structures of the lumbar spine maintain the coordination of grid nodes.This model has a high degree of simulation,and can demonstrate the structure and biomechanical properties of the normal lumbar spine through validity verification.2.The range of stress of each structure under 0-10cm pushing height of Spine Manipulation Bed simulates south Shaolin Daogaijinbei manipulation is as follows:(1)Vertebral body:Ll vertebral was from 6.79 to 42.60MPa,L2 vertebra was froml4.70 to 90.10MPa,L3 vertebra was from 25.90 to 117.OOMPa,L4 vertebral was from 16.50 to 88.60MPa,L5 vertebra was from 15.70 to 100.00MPa;The stress is L3>L5>L2>L4>L1.(2)Intervertebral joint:Ll-L2 intervertebral joint was from 1.36 to 11.40MPa,L2-L3 intervertebral joint was from 3.92 to 24.30MPa,L3-L4 intervertebral joint was from 5.17 to 31.30MPa,L4-L5 intervertebral joint was from 4.41 to 29.50MPa;The stress is L3-L4>L4-L5>L2-L3>L1-L2.(3)Intervertebral disc:L1-L2 intervertebral dis was from 1.36 to7.36MPa,intervertebral disc was from 1.64 to 7.82MPa,L3-L4 intervertebral disc was from 1.52 to 10.70MPa,L4-L5 intervertebral disc was from 1.52 to 9.20MPa,L4-L5 intervertebral disc was from 1.25 to 8.71MPa;The stress is L3-L4>L4-L5>L2-L3>L1-L2.(4)Anterior longitudinal ligament:Von Misses stress between 2.47and 21.20MPa.3 The line chart of stress-pushing height shows that the stress of vertebral body,intervertebral joint,intervertebral disc and anterior longitudinal ligament gradually increases with the increasing of pushing height by changes in Spinal Manipulation Bed simulates south Shaolin Daogaijinbei manipulation.Conclusions1.In the process of spinal manipulation bed simulates south Shaolin Daogaijinbei manipulation,the pushing height is the factor that affects the stress of lumbar vertebra,intervertebral joint,intervertebral disc and anterior longitudinal ligament.2.The maximum stress is mainly distributed in the posterior structure of lumbar spine such as pedicle,lamina and intervertebral joint,the most obvious in the lower segment of lumbar spine,so the clinical application should pay attention to control the pushing height to prevent the posterior structure damage.