The Feasibility Research Of The Oblique Pedicle Screw Placement For The Treatment Of Traumatic Compression Fracture Of Lumbar

Objective：To discuss the possibility of oblique pedicle screw placement by theanatomic measurement of the lumbar pedicle.Methods：Clinical data of52cases of lumbar computed tomography wereaccessed from February2011to December2013in this hospital.26of themwere screened with corresponding inclusion criteria.Collecting100three-dimensional reconstruction data of lumbar pedicle from these26cases.With these data,measure the maximum sagittal angle between thescrew and the pedicle while the screw break through the pedicle’s trailingedge with the standard entrance point（set the midpoint of the pedicle as astandard point),and also measure the sagittal section angle between thescrew and the pedicle while the entrance move vertically.Results：When use the standard entrance point,the maximum sagittal section angle:L1±18.2°±2.0°，L2±15.2°±2.9°，L3±14.1°±2.9°，L4±15.1°±3.6°，L5±17.4°±3.3°;when move up the entrance point:L15.2±0.6mm,L24.2±0.6mm,L34.2±0.5mm,L43.9±0.8mm,L54.0±0.8mm,the maximumsagittal section angle:L133.3°±3.2°,L228.4°±4.8°,L326.6°±4.8°,L428.2°±5.9°,L531.9°±5.3°.when move down the entrance point:L15.2±0.6mm,L24.2±0.6mm,L34.2±0.5mm,L43.9±0.8mm,L54.0±0.8mm,the maximum sagittal section angle:L1－33.3°±3.2°,L2－28.4°±4.8°,L3－26.6°±4.8°,L4－28.2°±5.9°,L5－31.9°±5.3°.Conclusions:The analysis shows that select a proper scope of the entrance point witha proper sagittal angle can place the screw into the uninjured part of thevertebra,the measurement can provide a anatomic basis for the injuredvertebra transpedicular fixation.The method can be used for the treatment oftraumatic compression fracture of lumbar.