Individualized localization of the lumbar pedicle screw entrance points by vertebral plate borderline / 中国矫形外科杂志

ABSTRACT

[Objective] To investigate the effectivity and reliability of individualized method to localize the entrance point of the lumbar pedicle screws by vertebral plate borderline.[Methods]Four vertebra specimen were taken the X-ray film of anterior-posterior views as the center of L2.On the X-ray film,the distance between the centre-point of the pedicle to the lateral and superior margins of the vertebral plate were measured,after applied barium at the centre-point of the pedicle,the specimen were taken the X-ray film once more,the relation of the barium to the centre-point of the pedicle was measured;the distance between the centre-point of the pedicle to the lateral and superior margins of the vertebral plate were measured on the normal lumbar X-ray film in 107 cases,the data in different sex and different projection 's center were compared;the method were applied to 40 patients of lumbar pedicle internal fixation,the information in hospital were reviewed to 30 patients of the lumbar pedicle screw localization by transverse process and transverse process.[Results]All(except L5)of lumbar plate borderline were displayed clear in the experiment,accurate rate of setpoint to be 92.5%.The principal X-ray affected scarely to the relation of the pedicle with the plate borderline of nearby two segment,but affected obviously far from three segment on the normal lumbar X-ray film;the accurate rate of one time 's setpoint in clinical application was 96%,average operation 's time being 96 minute,average lose blood being 212 ml,transverse articular process 's group showed significant difference.[Conclusion]Individualized localization of the lumbar pedicle screw entrance points by vertebral plate borderline is one of feasible method,displayed less trauma and accurate rate highly in the clinical application.