Index to Chiropractic Literature
Index to Chiropractic Literature
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Tuesday, May 18, 2021
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ID 26621
  Title Pelvic sagittal torsion caused by induced leg length discrepancy: Geometrical illusion may influence measures based on superior-iliac spines positions
URL https://pubmed.ncbi.nlm.nih.gov/33431280/
Journal J Manipulative Physiol Ther. 2021 Feb;44(2):128-136
Author(s)
Subject(s)
Peer Review Yes
Publication Type Article
Abstract/Notes

Objective: To investigate whether a common measure of sagittal pelvic torsion based on the superior iliac spines behave similarly to predictions of a rigid (non-torsioned) plane, when leg length discrepancies (LLD) are induced.

Method: Twenty-four young asymptomatic participants were subjected to pelvic posture measurements that use the anterior-superior iliac spines (ASISs) and posterior-superior iliac spines (PSISs) as references, while standing on level ground and with a one-, two- and three-centimeter lifts under the left foot. A special caliper with digital inclinometers was used. The following angles were measured: angles of the right and left PSIS-to-ASIS lines; right-left relative angle (RLRA), as the angle between the right and left PSIS-to-ASIS lines, which is a traditional lateral-view measure intended to detect sagittal torsions; angle of the inter-ASISs line; angle of the inter-PSISs line; anterior-posterior relative angle (APRA), as the angle between the inter-ASISs and inter-PSISs lines. According to trigonometric predictions based on the geometry given by the lines linking the superior iliac spines (i.e. a trapezoid plane), a pure lateral tilt of the pelvis, without interinnominate sagittal motion, would change RLRA in a specific direction and would not change APRA.

Results: Repeated-measures ANOVAs revealed that RLRA (p<0.001) and right and left PSIS-to-ASIS angles (p≤0.001) changed, and APRA did not change (p=0.33), as predicted.

Conclusions: At least part of the sagittal torsion detected by measures that assume the PSIS-to-ASIS angles as the sagittal angles of the innominates is due to pelvic geometry and not to the occurrence of actual torsion, when LLDs are induced.

Author keywords: torsion; measurement error; pelvis; leg length discrepancy

Author affiliations: Department of Physical Therapy, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil

This abstract is reproduced with the permission of the publisher; full text is available by subscription. Click on the above link and select a publisher from PubMed's LinkOut feature.


 

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