Anatomic Basis Of Percutaneous Pedicle Screw And Its Preliminaey Application Under Genuine Direct Vision

Objective:To provide minimally invasive spinal surgery with the anatomical basis for percutaneous pedicle screw,and analyze its possibility and its advantages in operation.Methods:through anatomy,knowing the posterior ramus of spinal nerves,the segmental artery and vein,knowing their region,branch,and distribution on 8 speciments.Result:The posterior ramus through out the intervertebral foramen posterior to the superior articular process of the below of the verebral.then divide into two branchs.The medical branch of the postreior ramus of the spineal nerver course dorsally from the lateral aspect of the superior articular process to the root of the transverse,and attached to the peiosteum by fibers.The lateral branch enter into the deep muscles of the back and domination.The posterior branch of the segmental artery and vein in the thoracolumbar region a rise laterally to the intervertebral foramen and run dorsocaudal inferior to superior articular process of the vertebral below.useing "C"-arm fluoroscopic guidance,finding the"eye" of the upper and lower vertebra in 8 cases of thoraco-lumbar fracture;planting pedicle screw system.compared with the treatment of traditional open pedicle screws system operationed in other 26cases.Conclusion:the region has no main ramus of spinal nerves and segmental artery which domination and nutrition the superior articular process and muscle of the posterior part.through the percutaneous plant the pedicle screws,with minimally invasive can we avoid mechancial damage to the posterior of spine nerver,segmental artery.this way has advantages of simplity,safety and less complication.