Applied Anatomy Study Of Middle Upper Thoracic Semi Pedicle Internal Fixation

Objective:Methods CT scanning image combined with autopsy, research and design of a safe and effective in the new type of operation that is fixed on thoracic pedicle screw into the posterior halfway in the new operation, solve the upper thoracic injury in patients with posterior pedicle screw with high difficulty and high risk problem.Methods:According to the different methods of the traditional screw fixation, by the pedicle nail into the road as the experimental control group; the half pedicle approach as experiment group. The experiments were performed according to the following path:(1) imaging studies using thoracic CT image, measurement of half Zhui Gonggen and Zhui Gonggen two into the path of the length, width, inclination angle, carries on the statistical analysis to the data set; according to the results of semi Zhui Gonggen approach screw parameters and simulation operation on cadaveric specimens uplink, the method of general observation and CT scanning by nails, and the traditional Zhui Gonggen approach of pedicle screws were compared, to assess its.(2) the use of adult frozen thoracic specimens from4, the interception is decomposed into32complete vertebral rib unit, randomized into experimental model, according to the nail pedicle screw parameters in thoracic semi production, and pullout strength test in comparison with the traditional method of screw implantation.3through two different surgical methods are respectively fixed specimens, tests of mechanical property, the use of strain measurement test technology and test two different methods for fixed vertebral compressive strength in compression; in reverse, the relation curve between the torque and angle and shear strength and bending strength, to evaluate the stability and stability of fixation strength vertebral body.Results:Through the measurement of vertebral morphology obtained parameters of screw nail grafting, simulation operation and in5fresh cadavers. The approach of pedicle screws were all successful, no nerve, blood vessel injury. After planting for two different approaches that nail biomechanical study of fixed model, in uplift compressive strength, anti torsion shear strength and bending strength and screw output, semi Zhui Gonggen approach implant technology and the traditional Zhui Gonggen into the road planting nail technology has stability similar to that in the application of coarse screw specification for fixed, upper middle thoracic semi Zhui Gonggen approach the planting of screw strength sufficient to reach fixation and orthopaedic requirements. Conclusion:Thoracic semi pedicle into the road safety and reliability, simple operation, easy to master, and has very high practicability. The placement method solves the problem of upper thoracic spine is provided with nails in clinical high risk, is a good choice to thoracic posterior fixation.