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Method for determining vertebral body positions in the sagittal plane using skin markers
J T Bryant1, J G Reid, B L Smith
1Department of Mechanical Engineering, Queen's University, Kingston, Canada.
Spine
|March 1, 1989
Summary
This study presents a new method to estimate vertebral body locations using external spinal profiles. The technique achieves high precision, aiding in non-invasive spinal analysis.
Area of Science:
- Biomedical Engineering
- Radiology
- Orthopedics
Background:
- Accurate localization of vertebral bodies is crucial for spinal analysis and treatment planning.
- Current methods may require invasive procedures or direct imaging of the spine.
Purpose of the Study:
- To develop and validate a method for estimating vertebral body centroid locations from external spinal profiles.
- To assess the precision of this estimation technique.
Main Methods:
- A normalization technique was applied to the spinal curve (T1 to L5) and approximated using cubic splines.
- Mapping functions were developed to transform skin surface profiles into vertebral centroid curves.
- Data from 13 adolescent subjects (ages 13-17) with radiopaque skin markers were analyzed.
Main Results:
- Vertebral body centroids were estimated from skin profiles with a standard error of 0.4 cm.
- Considering the lumbar curve separately improved the estimation precision to a standard error of 0.2 cm.
Conclusions:
- External spinal profiles can be utilized to accurately estimate vertebral body locations.
- This non-invasive method shows promise for clinical applications in spinal assessment.