Related Experiment Videos
Transverse plane pelvic rotation measurement.
Brennen Lucas1, Marc Asher, Terrence McIff
1Kansas University Medical Center, Kansas City, Kansas USA.
Studies in Health Technology and Informatics
|October 2, 2004
Summary
Pelvic rotation in the transverse plane can be accurately measured using the left/right ratio of distances between anatomical landmarks. This method is reliable for assessing pelvic asymmetry in conditions like idiopathic scoliosis.
Area of Science:
- Orthopedics
- Biomechanical analysis
- Radiographic imaging
Background:
- Iliac crest width asymmetry in the coronal plane is common in idiopathic scoliosis patients.
- This asymmetry can persist even after treatment, indicating underlying pelvic positional issues.
Purpose of the Study:
- To establish the relationship between transverse plane pelvic rotation and coronal plane anatomical landmark positioning.
- To develop a method for quantifying pelvic rotation using readily measurable landmarks.
Main Methods:
- Pelvic models were marked with radiopaque markers and radiographed at various transverse and sagittal angulations.
- The medial-lateral distance between symmetrical landmarks was measured to calculate a left/right ratio.
- A theoretical equation was derived to model the influence of pelvic shape on rotation.
Main Results:
- The ratio of the distance from the sacroiliac joint to the anterior superior iliac spine reliably indicated transverse plane pelvic rotation.
- This linear relationship remained consistent up to 25 degrees of rotation and was minimally affected by sagittal angulation.
- Theoretical analysis confirmed the influence of landmark angular relationships on rotation magnitude.
Conclusions:
- Transverse plane pelvic rotation can be determined by measuring the ratio of distances between bilateral pelvic landmarks.
- This quantitative approach offers a reliable method for assessing pelvic rotation, relevant for scoliosis assessment.