Pedicle violation and Navigational errors in pedicle screw insertion using the intraoperative O-arm: A preliminary report
Background ::: Use of computer-assisted insertion of pedicle screws has some advantages owing to the reportedly decreased incidence of pedicle breach and clinical events. Registration-based methods based on preoperative computed tomography imaging, 2D fluoroscopy, and 3D fluoroscopy are the most popular, however each has its limitations. O-arm–based navigation, which uses intraoperative acquisition and registration of navigated images, may overcome many of these disadvantages. We set out to study the clinical accuracy and navigational accuracy for pedicle screw insertion using our recently acquired O-arm and present our preliminary findings.
A NNE fault named F1 was found on the site of a proposed irrigation project.Through geological radar detection,seismo-geological investigation,the analysis of the engineering geological data,and the test of dislocation fault and overlying chronology of quaternary strata,we identify the activity,vertical displacement and slip rate of F1 fault.Then we assess the influence of F1 fault on the project and put forward the selection of sites and the design plan for the project.In this way,we provide a good example of the practical application of the identification of fault's activity to the selection of sites and the design plan for the construction project.