Evaluating the Accuracy of Navigation Assisted Pedicle Screw Placement of Spine Surgery

The object of study is the patients who are going to undergo pedicle screw fixation operation. there are two clinical trial centers.one is beijing jishuitan hospital,the other is beijing shuili hospital.the study protocol will be reviewed by the Ethics Committee of Beijing Jishuitan Hospital. after the patients sign the informed consent,they will be divided into two groups randomly.the patients' basic information and medical informations including the accuracy and safety will be collected.the data above all will be compared.