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Cortical bone trajectory screws for the middle-upper thorax: An anatomico-radiological study
Sun-Ren Sheng1, Jiao-Xiang Chen, Wei Chen
1Nan Fang Hospital of Southern Medical University, Guangzhou Department of Orthopedics Surgery, Second Affiliated Hospital of Wenzhou Medical University Department of Radiology, Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
Medicine
|September 2, 2016
Summary
This study quantifies thoracic spine morphometrics for safe placement of cortical bone trajectory (CBT) screws. Results show CBT screws are safe for the middle-upper thorax, providing surgical guidance.
Area of Science:
- Orthopedic Surgery
- Spinal Anatomy
- Surgical Navigation
Background:
- Accurate screw placement is crucial for spinal fusion success.
- Cortical bone trajectory (CBT) screws offer an alternative fixation method.
- Limited morphometric data exists for the middle-upper thoracic spine regarding CBT screw placement.
Purpose of the Study:
- To establish reference morphometric data for the middle-upper thoracic spine.
- To guide the optimal placement of CBT screws in this region.
- To assess the safety and accuracy of CBT screw insertion in cadaveric specimens.
Main Methods:
- Computed tomography (CT) scans of 80 patients were analyzed for anatomical parameters.
- Morphometric measurements were used to guide CBT screw implantation in 20 cadaveric specimens.
- Cadaveric vertebrae and X-rays were used to evaluate screw placement accuracy.
Main Results:
- Morphometric trends (length, diameter, angles) were identified from T3 to T8.
- Recommended CBT screw dimensions for the middle-upper thoracic spine are 5.0 mm width and 25-35 mm length.
- A low rate of screw misplacement (6/240 medial/lateral, 6/240 pedicle wall, 2/240 endplate) was observed in cadavers.
Conclusions:
- Cortical bone trajectory screws are safe and effective for the middle-upper thoracic spine.
- This study provides essential anatomical data for surgical planning and screw placement.
- The findings support the use of CBT screws in thoracic spine surgery.
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