| Objective:Compare posterior funnel technology into cervical vertebral pedicle screws and unarmed technology pedicle screws and lateral mass screws technology three different internal fixation method of resistance to pull down screws output and axial stiffness, uproot energy distinction, funnel technology into whether pedicle screw placement for safe and effective in clinical rational selection, provides the theory basis of fixed.Methods:Acquisition nationality relatively fresh moist with cervical specimens, they eliminated six soft tissue and muscle, carefully keep ligament and joint capsule, with poly (methyl methacrylate bone cement will C3upper and lower embedding, C7cervical laboratory specimen made complete. The specimen is divided into three groups: group A funnel technology for vertebral pedicle screw placement; Group B for lateral mass screws; Group C unarmed technology for the pedicle screws into groups. With the above respectively within three different methods of cervical stability, fixed screw output and maximum resistance to pull pull energy and axial stiffness comparison.Results:Will all the specimens are only one24screw output experiment pulled resistance (PULL-OUT), Results show that the group A resistance to PULL386.10+37.24N output for283.66+for group B27.40N, group C312.20+30.42N, for A group of relative displacement3.41+0.40MM, group B for4.25+0.26MM, group C j3.78+0.32MM for the group A thus output PULL than group B than group C, high quantity26.5%high19%, three have obvious difference (p<0.05). Explaining that the adoption of funnel technology into pedicle screws output strength higher than the resistance to PULL, and also higher than that of lateral mass screws unarmed pedicle screws, made-in-hong-kong PULL resistance of the lateral mass screws fixed effect than the worst and the resistance of the unarmed pedicle screws output also pulled low much.Three different screw internal fixation method of axial stiffness13.23+for A group of9.32N/MM, group B82.54+8.36N/for MM, group C66.74+6.64N/for corresponding MM, cervical vertebral arch in roots pull caused A when strain values of178.40+respectively for:14.44corresponding145.37+12.78ME, ME, ME14.22140.37+. Three, A group compared the axial stiffness, its highest than group B than group C high41%, high27%. Statistics show significant difference (p<0.05). Illustrate three different methods adopted in funnel technology fixed placing pedicle screws axial deformation of the resistance is the best, the most stable, secondly is cervical vertebral pedicle screw ACTS of technique, the worst is still lateral mass screws group.Three different energy screw, group A draw for3.44+0.32J, plus or minus A leel group B for2.09life-time TFR will be2.27group C J, plus or minus0.23J. Three groups than compared group A group B, higher than for39%34%of group C, which show significant difference (p<0.05). Proof group A screw make big pull, spends energy (make), screws reactive firm, and group B and C group than the group A relatively poor, and better still group C, the result of the group B with top similar conclusions.Conclusion:Biomechanical test results showed that cervical funnel technology into pedicle screws, pull resistance of the axial rigidity and pull out the energy are superior technical pedicle screws unarmed and lateral mass screws in screw placement, and the process of relatively high safety coefficient, the effect exactly, clinical application value. |
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