RESUMEN
The posterior spinal instrumentation with placement of intrapedicular implants has become an increasingly popular form of spinal fixation. A simple device was designed to facilitate the accurate location and fixation of more than one of the thoraco-lumbar pedicles by single application. The device consists of 4 metallic bars [2 long and 2 short] connected in a quadrangular shape, and 4 [2 in each side] autoclavable cylindrical plastic pin guide pieces for Kirschner wire [KW] placement. These pieces are changed during surgery with metallic ones, for drilling and screw fixation. Each guide piece can be adjusted in any desired location and direction. The device helped them in accurate placement of 72 pedicle screws in 18 cadaveric thoraco-lumbar spines with little need for readjustment. No pedicular perforation, fracture or misidentification was found. The operation time and exposure to radiation appeared to be reduced markedly