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Pelvic sagittal torsion caused by induced leg length discrepancy: geometrical illusion may influence measures based on superior-iliac spines positions.

Abstract：

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.

journal_name

J Manipulative Physiol Ther

journal_title

Journal of manipulative and physiological therapeutics

authors

Souza TR,Almeida RP,Pires CV,Pinto VA,Gonçalves BT,Carvalho DS,Barsante LD,Fonseca ST

doi

10.1016/j.jmpt.2018.11.038

subject

Has Abstract

pub_date

2021-01-08 00:00:00

eissn

0161-4754

issn

1532-6586

pii

S0161-4754(20)30084-1

pub_type

杂志文章

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Pelvic sagittal torsion caused by induced leg length discrepancy: geometrical illusion may influence measures based on superior-iliac spines positions.