Placement of Thoracic Pedicle Screws

Area of Science:

• Spinal Surgery
• Orthopedic Biomechanics
• Surgical Navigation

Background:

• Thoracic pedicle screws are the preferred spinal anchor due to superior biomechanics.
• They are vital for treating scoliosis, spinal deformities, trauma, tumors, and infections.
• Precise placement is critical, as malposition can lead to severe neurological or visceral injury.

Purpose of the Study:

• To review the techniques and considerations for accurate thoracic pedicle screw placement.
• To discuss the advantages and disadvantages of different screw trajectories and guidance methods.
• To outline the procedural steps and confirm accuracy for safe and effective spinal fusion.

Main Methods:

• Review of anatomical variations and established guidelines (e.g., Lenke).
• Description of two primary screw trajectories: straightforward and anatomic.
• Discussion of placement techniques: freehand, fluoroscopy-guided, and 3-D image-guided methods.
• Outline of surgical steps including preoperative planning, screw tract creation, and intraoperative imaging confirmation.

Main Results:

• The straightforward technique offers better insertional torque, while the anatomic trajectory provides a larger bone channel.
• Accuracy of placement remains debated, with varying definitions of acceptable versus optimal.
• Computed tomography (CT) is the gold standard for verification but involves significant radiation exposure.
• Intraoperative 3-D imaging offers the highest reliability but also the greatest radiation burden.

Conclusions:

• Surgeons must select techniques that are safe and reliable for their practice.
• Accurate thoracic pedicle screw placement is essential for successful surgical outcomes and accelerated rehabilitation.
• Postoperative monitoring and imaging are crucial to ensure construct integrity and patient safety.