Abstract:

BACKGROUND: It is difficult to locate pedicle in the patient with spondylolisthesis induced by lumbar spondylolysis because of spondylolysis, transposition of lumbar vertebrae and alteration of local anatomy. So it is necessary to find a new located method to locate pedicle.
OBJECTIVE: To rapid positioning of pedicle screw position through lumbar spondylolysis in order to reduce exposure of soft tissue, blood loss and operation time.
METHODS: Position relationship between the spondylolysis and the center of pedicle was analyzed and measured by anterior-posterior film. The distance of the center of pedicle to lumbar spondylolysis (L4, L5) was measured. Forty patients with spondylolisthesis were treated with rapid positioning of pedicle screw through lumbar spondylolysis. Operation time, blood loss and accuracy rate of locate pedicle were recorded and then a comparison of them was made between the AO method and new method.
RESULTS AND CONCLUSION: Distance of the center of pedicle to lumbar spondylolysis was (8.2±3.6) mm. Rapid positioning of pedicle screw position through lumbar spondylolysis can reduce the exposure of soft tissue, blood loss and operation time without nerve lesion during and after pedicle screw implantation.