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Video raster stereography back shape reconstruction: a reliability study for sagittal, frontal, and transversal plane
J Schroeder1, R Reer, K M Braumann
1Department of Sports Medicine, Faculty for Psychology and Human Movement Science, Institute for Human Movement Science, University of Hamburg, Turmweg 2, Hamburg, 20148, Germany, schroeder.sport@gmx.de.
Summary
Raster stereography shows high reliability for sagittal spine parameters but lower for frontal plane measurements. This non-invasive method is suitable for assessing spinal alignment in healthy individuals and for scoliosis screening.
Area of Science:
- Biomechanical analysis
- Spinal imaging technologies
- Quantitative morphology
Background:
- Raster stereography's reliability was previously established only for sagittal plane parameters within the same day.
- Previous studies lacked comprehensive evaluation across all spinal dimensions and varied time intervals.
Purpose of the Study:
- To investigate the intra-individual variability and reliability of 3D back shape reconstruction using video raster stereography.
- To assess parameters across sagittal, frontal, and transversal planes over different test-retest intervals.
Main Methods:
- Video raster stereography was used on 20 healthy volunteers.
- Intra-individual variability (SEM, CV%) and reliability (ICC) were measured for multiple spinal parameters.
- Test-retest intervals included same-day, between-day, and between-week assessments.
Main Results:
- High reliability (ICC > 0.90) was observed for sagittal plane parameters like pelvic tilt, kyphosis, and lordosis.
- Fair to high reliability was found for vertebral side deviation and scoliosis angle (0.71 < ICC < 0.95).
- Lower reliability was noted for frontal plane parameters and vertebral rotation, with slightly decreased coefficients for longer intervals.
Conclusions:
- Raster stereography is a reliable non-invasive method for 3D spinal alignment assessment in the sagittal plane for healthy individuals.
- The method shows partial reliability for scoliosis parameters, supporting its use in screening and monitoring.
- Future research should explore reliability in scoliosis patients with diverse spinal deformities.
