Advantages And Disadvantages Of Pedicle Screw Anchorage
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The use of pedicle screw instrumentation in the spine has evolved over the last two decades. The preliminary use of pedicle screws began in the lumbar spine. As surgeons became more comfortable with the complex anatomy required for accurate screw placement, the use of pedicle instrumentation has evolved to include their use in the thoracolumbar and thoracic spine. The impetus behind their increased use is a result of the many advantages that pedicle screw anchorage offers over traditional hook and rod constructs.
Improved deformity correction and overall construct rigidity are two important advantages of pedicle screw instrumentation due its 3-column control over the spinal elements.
First, pedicle screw instrumentation precludes the need to place instrumentation within the spinal canal with its inherent risk of neurologic injury. Second, the placement of pedicle…show more content… (1818) reported “twelve cases of cerebrospinal fluid leakage in 169 cases of pedicular screw placement. Most root sleeves are anchored inferiorly to the subjected pedicle”.7
In the lumbar region, the distance between the vertebral rami and the lateral border of the pedicle is 4.8 mm at L1 and 3.1 at L5.8
Pedicle morphometric parameters show considerable variations in different studies due to different characteristics of population studied. Proper preoperative evaluation should be done to accurately ascertain pedicle size before surgery so improper use of screw can be avoided.
Different morphometric studies suggests the method for determining actual pedicle dimensions is by careful measurements of pedicles.9
Studies suggest that the pedicle morphometry is variable in different population.10 Thus, the present study desires to study the morphometric parameters of the thoracic and lumbar pedicle in Indian population for its surgical