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The effect of posture on Quantec measurements
A M Macdonald1, C J Griffiths, F J MacArdle
1Regional Medical Physics and Orthopaedic Departments, Freeman Hospital, Newcastle-upon-Tyne, NE7 ZDN UK.
Studies in Health Technology and Informatics
|October 2, 2004
Summary
Investigating spinal topography in 33 patients revealed that shifting the center of gravity significantly altered lower spine curvature and pelvic tilt. While individual variations were notable, controlling stance improved measurement reproducibility for spinal alignment assessments.
Area of Science:
- Biomechanical analysis
- Spinal topography
- Orthopedic measurement
Background:
- Surface topography systems like Quantec are used for spinal measurements.
- Patient stance and weight distribution can influence spinal alignment readings.
- Understanding factors affecting measurement reproducibility is crucial for clinical accuracy.
Purpose of the Study:
- To investigate the impact of shifting the patient's center of gravity on spinal measurements.
- To assess the effect of extreme weight-bearing stances on spinal topography data.
- To evaluate the reproducibility of spinal curvature, pelvic tilt, and vertical alignment measurements under varying stances.
Main Methods:
- Utilized the Quantec Spinal Measurement System for surface topography.
- Recruited 33 patients undergoing spinal assessments.
- Measured changes in spinal curvature, pelvic tilt, and vertical alignment while patients shifted their center of gravity between extreme stances.
Main Results:
- Average changes of approximately 20 degrees were observed in lower spine curvature and pelvic tilt.
- Significant individual variations in response to center of gravity shifts were noted.
- Including extreme stances reduced the reproducibility of lower spine curvature, pelvic tilt, and vertical alignment measurements.
Conclusions:
- Patient's center of gravity significantly affects spinal topography measurements.
- Extreme stances introduce variability, potentially compromising measurement reliability.
- While not drastically, controlling patient stance could enhance the reproducibility of spinal alignment assessments.