High accuracy of 2D fluoroscopic based navigation of pedicle screw fixation in the lumbar spine utilizing cylinder pedicle design, innovative technique By Dr. Salah Al-Akkad, MD, FRCSC, FACS, FAANS, DABNS Johns Hopkins / Aramco Health Care Dhahran, Saudi Arabia
Research Question Does 2D fluoroscopic based Navigation of lumbar spine provide sufficient information for Appropriate guidance to the placement of pedicle screws (safety) Reliable training tool with consistency
Method Adoption of the cylinder design, and evaluate the margins of radiographic anatomy cases done percutaneously using tubes techniques or wiltsee approach Including only instrumentation of L1 to S1 Excluding tumors scoliosis thoracic
All cases done with IOM Cases 37 consecutive adult cases with 196 pedicle screws 2trauma, 7 degenerative 28 with spondylolysthesis grade I, II All cases done with IOM
Adoption of the cylinder design, and evaluate the margins of radiographic anatomy using Navigation Original Design was presented by Professor Richard Assaker 2004 , Dubai
Results Misplacement rate was 2.6%, 5 screws 2 screws had cortical encroachment medially (both are L1) the other 3 had lateral minor breach(<2mm) to the pedicle (all were L4), None IOM alert none resulted in neurological symptoms None needed reoperations
Reproducibility for Training Supervising 3 Navigated workshops 10 sessions, percutaneous, lumbar, navigated tools “tippitap” method , ( controlled, but no tactile sensation) 60 participant ( residents, fellows, registrars, attending's) 18 screws Using O-Arm for creating 2 D image view with available CT cuts for demonstration, Verifying results using O-Arm CT scan for 3D evaluation One minimal breach on radiographic 3D evaluation No difference the level of training by applying this method.
Using 2D fluoroscopic based navigation for the lumbar spine utilizing pedicle cylinder design for targeting lumbar pedicle Safe Reliable teaching tool