Cortical Bone Trajectory in Posterior Lumbar Fixation

Abstract

BT was proposed as a new trajectory that can improve the fixation of pedicle screws in response to screw loosening in osteoporotic patients. CBT involves a medial-to-lateral direction and a caudocephalad path aiming at maximizing thread contact with higher-density bone with a final aim of this track to improve the adhesion of the screws in osteoporotic vertebrae and to prevent instrumentation failure. However, some studies revealed contradictory findings concerning its effectiveness. Literature search and filtration on the effect of cortical bone trajectory in posterior lumber fixation yielded 22 studies. Review of the enrolled studies confirmed that CBT is a safe, plausible alternative modality to the traditional pedicle screw in posterior lumbar fixation. The use of CBT was associated with some complications; yet their incidence was found to be lower, when compared with the traditional pedicle screw, in the majority of the included studies. However, these studies use different techniques, different screw length and diameter and outcome measures. That is why CBT is recommended as a safe alternative of traditional screw in posterior lumbar fixation and further studies using standardized protocols are needed to confirm findings of the current study.