WHAT IS CT SCREW

Spinal fusion with bilateral traditional pedicle screw (TPS) fixation has been described for various surgical indications, such as spinal degenerative disc disease, spinal canal stenosis, spondylolisthesis, spinal trauma, spinal tumor and deformity. However, TPS fixation has some drawbacks, including significant muscle dissection required for the exposure of anatomical bony landmarks. ⁰¹

Cortical Trajectory Screw is an alternative trajectory for screw fixation aimed at increasing purchase of pedicle screws in higher density bone.

Cortical bone trajectory (CBT) screw insertion follows a lateral path in the transverse plane and caudocephalad path in the sagittal plane.

The starting point of a CBT screw is approximated at the intersection of the inferior border of the transverse process and the lateral superior articular facet. The trajectory is angulated cranially in the sagittal plane toward the anterior superior endplate without convergence in the transverse plane. ⁰²

REFERENCE

01 The technique of cortical bone trajectory screw fixation in spine surgery : a comprehensive literature review, AME Medical Journal Vol 3,No.1, 2018
02 The Cortical Bone Trajectory: An Alternative to Traditional Pedicle Screw Fixation – A Review : JSM Neurosurg Spine 4(1): 1061 (2016)