| The main pathological mechanisms of cervical spondylotic myelopathy ofcervical disc degeneration prominent and the posterior margin of osteophyteson the direct compression of the pyramidal corticospinal tract or the local bloodsupply to reduce the lead to clinical symptoms. Numerous clinical studies haveconfirmed that the anterior cervical decompression and fusion may be better toease short-term and long-term pain, an alternative to traditional conservativetreatment used in the treatment of cervical spondylotic myelopathy. But theexistence of such a surgical approach to the implantation of bone stability,often present after cervical potentially reduce the stability of the graft easyprolapse, the transplantation of bone fusion, interbody collapse, cervicalkyphosis intervertebral foramen diameter smaller fusion segment of reducedheight, spinal derangement and symptoms recurrence. The patients often takelonger neck collar loaded with fixed treatment and patient outcomes areaffected. With the development of fixation techniques, in order to obtain thestability of the bone graft and improve the life of patients with earlypostoperative patients start receiving anterior cervical decompression andfusion plate fixation with autologous bone grafts. With the study of materialsscience in recent years, various bone substitute materials for clinical use, bothcan be avoided itself to take the bone but also the same with good boneconduction and clinical significance of cervical vertebrae resection thedecompression titanium mesh implants with plate fixation is the one of the newdeveloped technique has been widely used in clinical, its advantages are alsorecognized. Objective: to simulate anterior cervical titanium mesh plate fixation andautogenous iliac bone graft plate fixed analog treatment of double segment ofcervical spondylotic myelopathy, vertebral subtotal titanium mesh platefixation and autogenous iliac bone graft platefixed fixed a systematic, objectiveanalysis and evaluation. Choose a reasonable procedure, and choice of implantsand fixation devices provide the scientific basis for clinical double cervicalspondylotic myelopathyMethod:4-month-old adult pig specimens from healthy fresh12are male.Autologous bone removed within2hours after the pigs were sacrificed andC3-C7cervical bone ligament specimens;12specimens were removedimmediately after processing specimens, excluding the muscle attached to thespecimens to retain the anterior longitudinal ligament, yellow ligament,interspinous ligament joint capsule of the facet joint and packages. A total of12cervical functional unit. Randomly taken from four specimens implantedtitanium mesh plate fixation group; randomly taken from four specimensimplanted autologous bone plate fixation group. Complete sample as a controlgroup.Specimens at both ends can be able to facilitate the formation and for theflexion experiments, both ends of the porcine cervical specimens fixed dilutionafter the denture powder. Curing specimens for24hours, mold release aftercuring specimens, specimens fusion cage placement. Randomly taken fromfour specimens implanted titanium mesh plate fixation group; randomly takenfrom four specimens implanted autologous bone plate fixation group. Completespecimens as control group.Sanding smooth specimens of the corresponding patch site, and then patchpart of the specimen is washed repeatedly with alcohol, free of impurities andthen with acetone, the specimens SMD parts volatile drying, and then pasteprocess in accordance with strict resistance strain gauge with502quick-drying glue to paste the resistance strain gauge.521production plants, gum parkedresistance strain gauge resistance strain gauge, resistance strain gaugeresistance of120±0.1ohms, the resistance strain gauge gauge1χ1mmresistance strain gauge sensitivity coefficient of2.08±0.1%. Paste theresistance strain gauge, paste in the vicinity of the adjacent strain gaugeterminals, then electronic strain gauge leads to the line welding in the terminal,after the wire welding.1points to edge on a steel plate adjacent to the C7vertebral body,2points for C6left side of the plate fixation screw hole below,3points for the screw holes in the C6the right side of the bottom,4points for the C4the right side of the top of the plate fixation screwholes at the top,5points for the C4on the left top, above the screw holes,6points for the lower edge and the steel plate adjacent to the C3vertebralSelection50,100,150,200the Ncm three kinds of load to load,50and100Ncm load is too small to cause data errors are too large waste, but200Ncm load is too large specimen destruction, ligament rupture phenomenon is thereforeabandoned. So the final selected150Ncm as the loading conditions tested,record the strain data of the corresponding measuring point.Statistical analysis using the SpSS11.0software to complete the statisticaltreatment of data to±s, using a completely randomized data (P <0.05)significant difference.Results: the status of each specimen during the experiment no autogenousiliac bone and titanium mesh prolapse or displacement, maximum stress andstrain of the titanium mesh and bone graft and internal fixation group andautogenous iliac bone graft and internal fixation group at the1st measurementpoint, this measuring point is located in the cervical6-7disc level. Since thefixation group in the iliac bone graft and titanium mesh fixed groupingcompared with the control group, in addition to small changes in the flexionstress range of the measurement points on the6th, the difference was notstatistically significant (P>0.05), range of motion of the remaining sites bothdecreased flexion stress and strain are reduced, and the difference wasstatistically significant (P <0.05). Titanium mesh implant neck5vertebrae cutafter plate fixation group compared with autologous iliac bone graft platefixation group, in addition to the six flexion range of motion of the measuringpoint and measuring point little change, no significant difference between (P>0.05), range of motion of the remaining sites were reduced flexion stress andstrain are reduced, and the difference was statistically significant (P <0.05).Conclusion:1.150Ncm bending, flexion experiment from the internal fixation group inthe iliac bone graft and titanium mesh placed in the internal fixation group, themaximum stress and strain have occurred in the1st measuring point, themeasurement points in the cervical6-cervical disc level. Ie, cervical vertebrasubtotal interbody fusion fixed neck6-7disc degeneration predilection sites. 2. anterior cervical corpectomy, fixed and autologous bone grafts, titaniummesh and bone graft titanium plate fixation with titanium plate compared, sincethe iliac bone graft titanium plate fixed only partially improve the stability ofcervical spine the application of anterior cervical titanium mesh and bone grafttitanium plate fixation can be significantly enhanced stability of the cervicalspine than the cervical functional unit stability. |
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