Anatomical Study On Thoracic Internal Fixation In The T2 Thoracic Vertebra

Objective: by measuring the morphological character istics of the pedicle of T2 segment to provide a new way to input nails,improve the clinical application of thoracic pedicle screw operating difficulties, lower the risk of big problems, and demonstrate the thoracic vertebra pedicle screw database to provide anatomical information, methods of verification home nail science, feasibility, practicality.Methods: T2 thoracic segment of the pedicle sagittal angle, height and lamina pedicle angle changes and so little with the rest of the thoracic segments similar to the data. Selected 10 cases on the thoracic vertebrae T2-drying samples (men and women do not mind), rule out the obvious trauma, malformations such as hyperplasia, Methods nails into both sides of the transverse process in connection with the ridge along the edge of both sides of the vertebral articular process of the outer edge of the two vertical line as the point of intersection of all of the thoracic pedicle screw on both sides point to the vertical plane in the thoracic isthmic screw direction as the direction of (thoracic isthmus is defined as the upper and lower part of the middle facet, more than for the lower edge of articular process the last, the following edge of the articular process for the next to the root of the medial to lateral transverse process industry, the above inner edge of the lateral facet for the medial profession). The use of standardized instruments for spine after the nail home, then in accordance with the Road axis for cutting nails. The use of vernier caliper and angle meter entities T2 measurements of each segment pedicle screw length, the minimum diameter of the pedicle, the vertebral Road axis of pedicle screw placement in the section on point of view (E, c.) and the nail axis and the thoracic vertebrae Road isthmus of the angle between the vertical plane (F Kok). All the data for statistical SPSS10.0.Result: Based on statistical analysis of measurement data we can come up with the following conclusions: 1) thoracic segment T2 is input nail with angle E of about 25°±3.3. 2) According to the measured data of F angle, we can see that parallel to the endplate at home nail Road thoracic isthmic axis and the vertical plane approximation. Isthmus to the vertical and the direction of a screw into the screw method in the literature at home and abroad has been reported rarely. According to the measurement results we know not only the feasibility of this method, and nail Road axis of the vertebral end-plate and parallel, with good usability, aesthetics .3) nail home for security reasons, screw diameter should be about 3.0 mm, in order to prevent complications caused by cortical screw perforation. 4)the choice of screw length should be determined by the measure in the length of nail 80%, which is between 2.67cm-3.2cm to prevent the screw anterior cortex perforation caused by complications. 5) In this paper, there are some of the home nail screw nail Road may occur pedicle wall breakthrough, but it is feasible in accordance with literature reports of .6) small sample size as a result of this article, and as a result of dry and normal vertebral body specimens of different physical and chemical properties, data given may be some deviation of .7 is room for improvement) of the proposed method of home nail has the following advantages: a superficial articular process, easy to expose, to reduce the surgical trauma; II shortened operative time and reduce bleeding; three simple and accurate identification of pedicle tube mouth, and easy to operate. Four transverse process does not involve, or damage to mutate transverse process would not be affected. 8) In this paper, nailing home the inadequacy of methods: Although a study by the thoracic pedicle screw fixation of the anatomical point of view of the new method is own nails to explore, but there are a small number of samples, a single segment , a direct result of dispersion statistics major interval. Second, dry thoracic vertebrae in vivo specimens with the different physical and chemical properties, which may result in this study, the limitations of the data, resulting in practical work in clinical certain applications there may be obstacles, the need for fresh specimens associated thoracic clinical application and biomechanical study research, and practical summary of the effects of home evaluation nails. Road three nails in the sagittal plane of the measurement point of view on the map in the specimen after the measurement of angle of inclination, if the drawing is not accurate, will have an impact on the accuracy of the data. Measurement of length of nail wire nails home is the basis of clinical need of the measurement line, rather than the traditional sense of the pedicle axis, to explore whether there when needed.Conclusion: After both sides of the ridge to connect the upper edge of transverse process and vertebral body along both sides of the outer edge of the next facet of the intersection of two perpendicular screw points as to perpendicular to the isthmus of the thoracic screw direction (angle E is about 25°and F angle of about 90°) in the T2 segment pedicle screw placement, this method is simple, with superficial anatomy signs, easy to observe, apply to clinical practice, and it also has the advantages such as secured, easy to underst and,handle,also is a good way to implant nails.