Screw and screw reduction

Any degree of spondylolisthesis can be achieved by traction. The Steffee operation is fixed by a trough plate, and there is no effect of pulling the spine. Only the effect of pulling the vertebral body backwards is required, and the fusion of the bone graft is high, and there is still a certain recurrence of spondylolisthesis. The screw and the screw are used for resetting and fixing, which not only has the function of pulling and distracting, but also the function of pulling the vertebral body backwards. The reduction of the vertebral body is relatively easy, and the splinting of the spine is maintained, and the recurrence of the spondylolisthesis is less. It is also superior to Steffee surgery in terms of ease of operation. Treatment of diseases: non-union of fractures 1. Incision and exposure: The posterior median incision, the length of the incision is determined by the degree of slippage and the fixed range. The I-II degree slippage fixes the upper and lower vertebral bodies of the slippage, and the two vertebral bodies of the upper and lower sides are fixed by severe slippage. The superior iliac spine was cut in the median, and the sacral spine muscles on both sides of the spinous process were removed from the subperiosteal with a laminar stripper to expose the spinous processes and lamina. Because of the need for pedicle screw fixation, the sacral spine should be stripped to both sides. Exceeding the joint to the base of the transverse process, the incision is retracted to the sides with an automatic retractor to reveal the fixed site. According to the preoperative spinous process needle positioning or the intraoperative sinus disease, the vertebral body is carefully determined. The lateral edge of the above articular process is the longitudinal line, and the midline of the transverse process is the horizontal line. The intersection point of the two is the pedicle screw. Needle point. The needle insertion direction is inclined inward by 10° to 15°. Sliding the vertebral body with bolts, screwing the upper and lower vertebral bodies with a screw, selecting the appropriate length of the vertebral body screw, screwing the vertebral body screw head into the shank end with the screw knob, and holding the screw through the pedicle into the point and slowly screwing into the dislocation One vertebral body. Use a handle bolt to screw the bolt into the pedicle of the vertebral body. After using the X-ray machine with image intensifier, after checking the depth and position, the bolt first closes the nut to the root, so that the opening direction of the screw head is the same, then the bolt passes through the center hole of the screw, and the screw is inserted into the screw head. Inside the opening, tighten the nut at both ends of the screw and clamp the head of the screw. 2. Follow the bolt and then put on a nut to start the vertebral body slippage. Turn the screw nut to both ends to create the longitudinal expansion function, and then tighten the bolt and nut to produce the function of pulling the vertebral body backwards. Open up and pull back, until the bolt and nut are tightened, and the vertebral body is removed. 3. Cut off the long bolts and check that the nuts are not loose. Use a round chisel or a small flat chisel to cut the transverse process, facet joints, lamina and spinous processes into rough surfaces, and take the free bones from the posterior superior iliac spine. In the form of thin strips, posterior spinal fusion. 4. Suture the incision in turn, leaving the vacuum suction tube.

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