Effect of simulating leg length inequality on pelvic torsion and trunk mobility

Young, Rebecca S.; Andrew, Paul D.; Cummings, Gordon S.

doi:10.1016/s0966-6362(00)00048-5

Cited by 70 publications

(65 citation statements)

References 21 publications

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“…Clarifying the investigators' terminology, what they described as resulting "anterior pelvic rotation" is not actually an absolute innominate or whole pelvis rotation, but rather a change in the amount of innominate rotation around a transverse (ie, horizontal) axis, that is, pelvic torsion. Lifts did not reduce torsion in subjects with appreciable preexisting pelvic tilt, consistent with the finding of Young et al 23 in another population of nonscoliotic patients.…”

Section: Artificial Temporarily Induced Llisupporting

confidence: 89%

“…Statistically significant changes were stated to be dose related, although supporting data were not provided. Lifts did seem to reduce torsion in subjects with preexisting pelvic tilt, unlike what was reported in the study of Young et al 23 in nonscoliotics, where lifts did not reduce the amount of pelvic torsion.…”

Section: Artificial Temporarily Induced Llicontrasting

confidence: 72%

“…In this carefully executed study, there was a very tight correlation between leg elevation and innominate rotation. Elevating either the right or the 23 interested in both exploring the effect of artificial LLI on trunk motion and confirming the results of other studies, placed various amounts of lift (ranging from 15-34 mm) under either the left or right foot of 29 mostly female subjects, so as to either level or unlevel the pelvis, as the case may be. The iliac crests were measured with an inclinometer using bubble technology.…”

Section: Artificial Temporarily Induced Llisupporting

confidence: 67%

“…Young et al 23 point out that it would be "naive" to suppose that differences in iliac crest heights of a standing patient reflect LLI alone; pelvic torsional effects also impact upon crest heights and in fact may result in underestimating anatomical LLI. This might explain the poor agreement found by Rhodes et al 40 between visual methods of leg checking and upright radiographs.…”

Section: Study Observationsmentioning

confidence: 99%

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The relationship between pelvic torsion and anatomical leg length inequality: a review of the literature

Cooperstein

Lew

2009

Journal of Chiropractic Medicine

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Objective: Although it is common to find assertions relating functional leg length inequality (LLI) to pelvic torsion and other states of subluxation, comments and/or data concerning anatomical LLI in this same context are uncommon. This review of the literature synthesizes the evidence on pelvic torsion in relation to anatomical LLI. Methods: The literature was searched using the PubMed; Manual, Alternative, and Natural Therapy Index System; Allied and Complementary Medicine Database; Cumulative Index to Nursing and Allied Health Literature; and Index to Chiropractic Literature databases for primary studies that related LLI, either artificially created or naturally occurring, to pelvic torsion. Extracted data included natural vs artificial LLI, method of creating or detecting LLI, subject selection, methodology for measuring pelvic torsion, and results. Results: Nine English-language studies were retrieved published 1936-2004. Seven determined the impact of artificial, transient LLI on pelvic torsion, whereas 2 studied the effect of naturally occurring LLI. Conclusion: Across varying methodologies for measuring LLI and pelvic torsion, a consistent, dose-related pattern was identified in which the innominate rotates anteriorly on the side of a shorter leg and posteriorly on the side of the longer leg. This finding was contrary to the common assertion that the ilium rotates posteriorly on the side of a short leg and vice versa. Practitioners of manual medicine who derive vectors for intervention based on leg checking procedures should consider the possibility that the direction of pelvic torsion may be variable depending on whether the LLI is of anatomical or functional origin.

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Section: Artificial Temporarily Induced Llisupporting

confidence: 89%

Section: Artificial Temporarily Induced Llicontrasting

confidence: 72%

Section: Artificial Temporarily Induced Llisupporting

confidence: 67%

Section: Study Observationsmentioning

confidence: 99%

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The relationship between pelvic torsion and anatomical leg length inequality: a review of the literature

Cooperstein

Lew

2009

Journal of Chiropractic Medicine

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“…They also noted that individual differences in response do exist. Young et al [30] reported in 2000 that an artificially created LLI significantly increased the pelvic torsion. Other authors, like Pitkin [25] and Beaudoin [1], also confirmed these observations.…”

Section: Discussionmentioning

confidence: 99%

The effect of simulating leg length inequality on spinal posture and pelvic position: a dynamic rasterstereographic analysis

et al. 2011

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Introduction Leg length inequalities (LLI) are a common finding. Rasterstereography offers a non-invasive, contactfree and reliable method to detect the effects of LLIs on spinal posture and pelvic position. Materials and methods A total of 115 subjects were rasterstereographically examined during different artificially created leg length inequalities (5-15 mm) using a platform. The pelvic obliquity and torsion and the lateral and frontal deviation of the spine, as well as the surface rotation, were measured. Results Changes in platform height led to an increase of the pelvic tilt and torsion. Only minor changes in the spinal posture were found by different simulated leg length inequalities. Conclusions Our study showed that there was a correlation between an artificial leg length inequality up to 15 mm and pelvic tilt or torsion, but only minor changes in the spinal posture were measured. Further studies should investigate the effects of greater leg length inequalities on spine and pelvis.

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