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Related Concept Videos

Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...

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Related Experiment Video

Updated: Jul 5, 2026

C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position
12:25

C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position

Published on: September 16, 2022

Odontoid screw placement using Isocentric 3-dimensional C-arm fluoroscopy.

Lori E Summers1, Joshua G Kouri, Mu Yang

  • 1Department of Neurological Surgery, McKnight Brain Institute, University of Florida, Gainesville, FL 32610, USA.

Journal of Spinal Disorders & Techniques
|April 18, 2008
PubMed
Summary

Isocentric 3-dimensional fluoroscopy simplifies odontoid screw placement for type II fractures. This technique ensures successful screw placement, reduces radiation exposure, and offers immediate verification of screw position.

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Published on: January 6, 2023

Area of Science:

  • Neurosurgery
  • Orthopedic Surgery
  • Medical Imaging

Background:

  • Odontoid screw fixation is a common treatment for type II odontoid fractures.
  • Advancements like biplanar fluoroscopy and cannulated screw systems have improved screw placement.
  • Isocentric C-arm fluoroscopy offers potential benefits for ease and accuracy.

Purpose of the Study:

  • To evaluate the benefits of isocentric 3-dimensional fluoroscopy for odontoid screw placement.
  • To demonstrate the efficacy of this technique in treating type II odontoid fractures.

Main Methods:

  • Isocentric 3-dimensional fluoroscopy combined with image-guided navigation was used.
  • Three-dimensional images were acquired intraoperatively and uploaded to a navigation workstation.
  • Screw trajectory was planned and executed using tracked instruments in 9 patients.

Main Results:

  • Successful odontoid screw placement was achieved in all 9 patients.
  • Intraoperative computed tomography confirmed accurate screw positioning.

Conclusions:

  • Isocentric 3-dimensional fluoroscopy with image guidance simplifies screw placement.
  • This method reduces the need for biplanar fluoroscopy and decreases radiation exposure.
  • It allows for immediate intraoperative verification of screw placement.