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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Related Experiment Video

Updated: Mar 1, 2026

A Teleoperated Robotic System-Assisted Percutaneous Transiliac-Transsacral Screw Fixation Technique
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Ideal T1 laminar screw fixation based on computed tomography morphometry.

Xiao-Bo Wang1, Xin Zheng2, Hou-Qing Long3,4

  • 1Department of Spine Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, People's Republic of China.

BMC Musculoskeletal Disorders
|June 5, 2017
PubMed
Summary
This summary is machine-generated.

Laminar screws offer an alternative fixation for the first thoracic vertebra (T1). This study found no anatomical limitations for T1 laminar screw placement and introduced a modified sagittal reconstruction method for precise measurements.

Keywords:
CT scanLaminar screwRadiographic parametersUpper thoracic spine

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Area of Science:

  • Spine surgery
  • Anatomical studies
  • Surgical techniques

Background:

  • Laminar screws provide an alternative fixation method for the first thoracic vertebra (T1).
  • Accurate anatomical measurements are crucial for safe and effective T1 laminar screw placement.
  • Existing methods may lack precision for T1 laminar screw insertion.

Purpose of the Study:

  • To determine the anatomical characteristics of the T1 lamina for adequate laminar screw fixation.
  • To present a modified sagittal reconstruction method for T1 to enhance measurement accuracy.
  • To assess the feasibility of T1 laminar screw placement based on anatomical parameters.

Main Methods:

  • Computed tomography (CT) images of 62 patients were analyzed.
  • Key T1 lamina parameters (length, axis angle, cortical width/height, etc.) were measured using Mimics software.
  • A novel modified sagittal reconstruction technique was employed for precise measurements.

Main Results:

  • No significant side-to-side differences were observed in measured parameters (P > 0.05).
  • Significant differences in lamina dimensions were noted between males and females (P < 0.05).
  • Specific measurements indicated potential anatomical variations in minimal outer cortical width and height, particularly in females.

Conclusions:

  • The study suggests no major anatomical limitations for T1 laminar screw placement in the general population.
  • The modified sagittal reconstruction method facilitates accurate and easy measurements for T1 laminar screw insertion.
  • This technique improves visualization of the optimal screw insertion trajectory.