Percutaneous lumber pedicle screw placement with the use of a novel spinal location system

WANG Zuowei; WU Hao; CHEN Zan; WANG Xingwen; YUAN Qingguo; JIAN Fengzeng

Abstract：Objective The aim of this study was to introduce a novel spinal location system for percutaneous pedicle screw placement and to evaluate the accuracy of puncture with the use of spinal location system in minimally invasive spine surgery (MISS).Methods The accuracy of puncture with the use of spinal location system in4 adult cadavers was evaluated.Forty-eight Kirschner wires were inserted into bilateral pedicle from L1 to S1 using spinal location system.The distances between the planned and actual puncture points on pedicles were measured.The excellent and good rate of Kirschner wire placement was evaluated according to the assessment standard of Richter.Results Using the spinal location system,48 Kirschner wires were implanted successfully and 96 puncture points were measured.The average distance between the planned and actual puncture points on lateral part of pedicle were 1.8 mm (X-ray anteroposterior view,A-P view) and 1.6 mm (X-ray lateral view,L view);the average distance on internal part of pedicle were 2.0 mm (A-P view) and 1.9 mm (L view);The average puncture distance deviation was 2.4 mm.The puncture results were excellent in 34 cases (70.8％),good in 10 cases (20.8％),and poor in 4 cases (8.3％).The excellent and good rate was 91.7％.Concluion Based on the resulting data,the novel spinal location system improves the accuracy in percutaneous spinal surgery,so it has exhibited a good technical and market prospect.