The Cortical Bone Trajectory for Lumbar Spine Fusion

Daniel L. Shepherd, Mohammed Ali Alvi, Meghan E. Murphy, Panagiotis Kerezoudis, Frank Corl, Patrick W. Hitchon, Ahmad Nassr, Mohamad Bydon

Research output: Contribution to journalArticle

Abstract

Cortical bone trajectory, also called cortical screw trajectory, is a novel, less invasive fusion alternative for disorders affecting the lumbar spine. Cortical screw constructs have several touted advantages over traditional pedicle screw constructs. First, the surgical exposure required for instrumentation placement is less than that required for traditional pedicle screw placement. This reduced exposure can help reduce blood loss and other approach-related morbidity. Second, the unique screw trajectory, along with a cortically threaded screw, allows for increased cortical bone purchase within the lamina and pedicle. This improved bone purchase can result in improved screw pullout strength, and possibly reduce the chance of screw loosening. Finally, cortically placed screw heads rest on top of the vertebral lamina, which is significantly more medial than traditional pedicle screws, making them more accessible and rod placement more straightforward. Cortical bone trajectory has been validated with several biomechanical cadaveric studies and shows promise with early clinical testing. The cortical screw trajectory may provide patients with lumbar spine pathology a less invasive fusion alternative. This article serves to describe the operative technique and provides a current review of the literature.

Original languageEnglish (US)
JournalOperative Techniques in Orthopaedics
DOIs
StateAccepted/In press - 2017

Fingerprint

Spine
Head
Pathology
Morbidity
Bone and Bones
Pedicle Screws
Cortical Bone

Keywords

  • Cortical bone trajectory
  • Cortical screw trajectory
  • Lumbar fusion
  • Minimally invasive surgery
  • Spine surgery

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

Shepherd, D. L., Alvi, M. A., Murphy, M. E., Kerezoudis, P., Corl, F., Hitchon, P. W., ... Bydon, M. (Accepted/In press). The Cortical Bone Trajectory for Lumbar Spine Fusion. Operative Techniques in Orthopaedics. https://doi.org/10.1053/j.oto.2017.09.011

The Cortical Bone Trajectory for Lumbar Spine Fusion. / Shepherd, Daniel L.; Alvi, Mohammed Ali; Murphy, Meghan E.; Kerezoudis, Panagiotis; Corl, Frank; Hitchon, Patrick W.; Nassr, Ahmad; Bydon, Mohamad.

In: Operative Techniques in Orthopaedics, 2017.

Research output: Contribution to journalArticle

Shepherd, DL, Alvi, MA, Murphy, ME, Kerezoudis, P, Corl, F, Hitchon, PW, Nassr, A & Bydon, M 2017, 'The Cortical Bone Trajectory for Lumbar Spine Fusion', Operative Techniques in Orthopaedics. https://doi.org/10.1053/j.oto.2017.09.011
Shepherd, Daniel L. ; Alvi, Mohammed Ali ; Murphy, Meghan E. ; Kerezoudis, Panagiotis ; Corl, Frank ; Hitchon, Patrick W. ; Nassr, Ahmad ; Bydon, Mohamad. / The Cortical Bone Trajectory for Lumbar Spine Fusion. In: Operative Techniques in Orthopaedics. 2017.
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