The Treatment Of Traditional Chinese Medicine With Lumbago And Biomechanical Comparison Study On Different Interval Fusing Operation Patterns

Objectives: When treating lower lumbar vertebra unsteadiness with the technology of threaded fusion cages, we conduct a biomechanical tests and control study on the situations of using different quantities of pediculus screws, in order to save the costs of interval fixation material by reducing the quantities of screws, to give a reference for clinical application.Methods: Choose lumbar verbebra specimens of some one-year-old catties, cutting the segments of L5-L6, and put them into a refridge with a temperature of -20℃. Unfreeze the specimens to room temperature when testing, and remove the the skin, hypoderma, resect the soft tissue becide the verbebras, reserving the verbebra bone, joints and all sorts of ligments tissue. Then excarnate the two ends of the specimens, fix them on the biomechanical tests machine in turn. Firstly, carry out a preparative experiment on them to eliminate the influence of the viscoelasticity of joint capsule and ligments and the creep movements of vertebras, then we can do the definitive tests. Testing methods: divide the 6 specimens into 5 groups of models: 1.integral specimens(group 1). 2.fissure isthmus specimens(group 2). 3.fused specimens with TFC implantedleft dorco-posterior, oblique direction(group 3). 4. fused specimens with TFC implanted left dorco-posterior, oblique direction and pediculus screws on the right(group 4). 5. fused specimens with TFC implanted left dorco-posterior, oblique direction and pediculus screws on both sides(group 5). Exert axial compression, ventriflexsion, dorsal flexure, lateral bending, clockwise rotation 5 absolute moment of force loads on the 6 specimens ( fix the specimens on the frame made by ourselves which rotation force is added when doing the rotation tests).Then use some instruments to record the displacement. Choose a load as standard, grouping the displacements under the load. And then do statistics treatment on the statas with the software of SPSS 11.5.Results: When axial compressed, group 1 and group 2 , group 2 and group 5 are bally obviously different(P<0.01), other groups have no obvious difference between each other(P>0.05); when ventriflexsion and dorsal flexure, there are no difference between one and another among the groups(P>0.05); when lateral bending, group 1 and group 3, group 2 and group 3 have bally obvious difference(P<0.01), group 1 and group 4, group 2 and group 4 have obvious difference (P<0.05), and other group have no obvious difference(P>0.05); when clockwise rotation, group2 and group 3, group 2 and group 5 have obvious difference between each other(P<0.05), other groups have no obvious difference(P>0.05). Conclusions:1. Fissure isthmus reduce the stability of the lower lumbar vertebra, fissure isthmus specimens can be used as the models of lower lumbar vertebraunsteadiness.2. When we use these three means to treat with lower lumbar vertebra unsteadiness: 1.fused specimens with TFC implanted left dorco-posterior, oblique direction(group 3). 2. fused specimens with TFC implanted left dorco-posterior, oblique direction and pediculus screws on the right(group 4). 3. fused specimens with TFC implanted left dorco-posterior, oblique direction and pediculus screws on both sides(group 5), the displacements of the three groups in every direction have no obvious difference .So in theory we can use single-side of pediculus screws or use no screws to assit threaded fusion cage to treat with lower lumbar vertebra unsteadiness.3. These conclusions need to be proved by cilinical cases.