Among the numerous spinal instrumentation devices currently available, transpedicular screw fixation has become one of the most popular methods of providing segmental stability. To avoid damage to surrounding dura, nerve roots, or vascular
structures,
proper placement of the screw is critical and it is influenced by anatomic consideration, such as pedicle size and location, spinal canal shape, vertebral body depth, and bone density.
Having made screw holes using flexible drill bit, the authors confirmed that they were safely fixed within the pedicle using intraosseous endoscopy for 124 pedicle screws fixed patients from May. 1991 to July. 1994 at Korea University Anam
Hospital.
In result every pedicle screws were located within the pedicle and no complications were observed Therefore, pedicle screw fixation using flexible drill bit and direct visual confirmation of screw holes with intraosseous endoscopy are an
efficient
method to prevent the complications in pedicle screw fixation.
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