Related Experiment Video
Updated: Feb 3, 2026
06:24
A Spine Robotic-Assisted Navigation System for Pedicle Screw Placement
Published on: May 11, 2020
9.4K
Variability Analysis of Manual and Computer-Assisted Preoperative Thoracic Pedicle Screw Placement Planning
Dejan Knez1, Janez Mohar2, Robert J Cirman2
1Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia.
Spine
|October 17, 2018
Summary
Computer-assisted planning for pedicle screw placement shows variability comparable to manual methods. This technology offers a adaptable tool for spine surgery, potentially improving accuracy and consistency in surgical planning.
Area of Science:
- Spine Surgery
- Orthopedic Technology
- Surgical Planning
Background:
- Computer-assisted methods for pedicle screw placement planning are emerging.
- A systematic comparison of variability between manual and computer-assisted planning is lacking.
Purpose of the Study:
- To compare manual and computer-assisted pedicle screw placement planning.
- To analyze inter- and intraobserver variability in planning approaches.
Main Methods:
- Preoperative plans for 256 pedicle screws were created manually by two surgeons (2 sets each).
- Automated plans were generated using a 3D computer-assisted method optimizing screw fixation based on bone density.
- Manual and automated plans were compared for variability.
Main Results:
- A significant difference was noted in pedicle screw sagittal inclination.
- Interobserver variability between a surgeon and the computer-assisted method was comparable to intraobserver variability.
Conclusions:
- Computer-assisted pedicle screw placement planning demonstrates variability within the range of manual planning.
- This suggests the computer-assisted approach is a viable tool for spine surgery.
- The system can be customized to surgeon preferences.
Related Concept Videos
01:11Variability: Analysis
511
Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
The range is a simple measure of variability, indicating the difference between the highest and...
The range is a simple measure of variability, indicating the difference between the highest and...
511
01:21Screw: Problem Solving
701
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
To evaluate the...
701
01:16Self-Locking Screw
2.5K
A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
2.5K
01:15Thoracic Aorta
1.7K
The thoracic section of the aorta begins at the T5 vertebra and extends to the T12 level at the diaphragm, initially progressing through the mediastinum to the left of the spinal column. Throughout its course in the thoracic segment, the thoracic aorta emits various offshoots known collectively as visceral and parietal branches. The branches that predominantly supply blood to visceral organs are termed visceral branches and include bronchial, pericardial, esophageal, and mediastinal arteries,...
1.7K
01:17Frictional Forces on Screws
1.6K
Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
1.6K
01:23Sampling Plans
985
Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
985