The Improved Setting-screw Technique On The Preoperative CT Scanning Lumbarthoracic Pedicle

Object: Dispuss and summarize the improved setting-screw technique of the lumbar-thoracic pedicle on the preoperative CT scanning the pedicle axes. Methods: The improved setting-screw technique of the lumbar-thoracic pedicle is that the preoperative CT scanning confirmed on the pedicle axes. The screw setting position is obtained in consulting the anatomic symbol nearby the pedicle axes. The inter-incline angle (E-angle) and length and diameter of screw can be numerated in the CT scanning film of pedicle axe. The arrow-state angle (F-angle) can be numerated in the lateral X-ray film of spine or educed in observing the line of spine process. The 56 cases of the thoracic-lumber vertebra (the 242 piece of the pedicle screws) were setting screw in the improved screw-setting technique.Results: After operation the pedicle of all case was rechecked in the CT scanning. The 238 piece of screws completely put inside the pedicles, only the 4 piece put out the cortex of the pedicle, the fault ratio is 1.65%, but the destroy of the cortices is fairly small, and all the cortices-destroyed case haven't the symptom of nerve root.Conclusion: The improved screw-setting technique of the lumber-thoracic pedicle that refer to the anatomic symbol nearby the pedicle axes confirmed in the preoperative CT scanning is a better method, it can effectively descend the ratio of bad screw.