Anatomical and radiological correlation of Lequesne's "false profile"

Fabeck, Laurent; Farrokh, Dordaneh; Behets, Catherine; Delince, Philippe

doi:10.1007/s00276-002-0038-1

Cited by 14 publications

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“…However, the VCA angle of Lequesne had a low and nonsigniWcant correlation with the anterior acetabular coverage in the sagittal plane. This is in line with the anatomical and radiological investigation of Fabeck et al [3] demonstrating that the VCA angle does not correspond to a real anatomical structure. However, the fact that only four whole body specimens (eight hips) were available in the present study may limit this Wnding and a greater number of specimens might have rendered this correlation signiWcant.…”

Section: Discussionsupporting

confidence: 74%

The anterior center edge angle in Lequesne’s false profile view: interrater correlation, dependence on pelvic tilt and correlation to anterior acetabular coverage in the sagital plane. A cadaver study

Zingg

Werner

Sukthankar

et al. 2008

Arch Orthop Trauma Surg

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Introduction Lequesne's vertical-center-anterior margin (VCA) angle measured on the false proWle view of the pelvis aims at quantifying the anterior acetabular coverage of the femoral head. The anterior delimitation of the acetabular roof is often deWned on the false proWle view but there are no data on its interrater reliability. Additionally, it is not known how pelvic tilt may inXuence this angle. Finally, the plane in which this angle is measured lies at an angle of 65°t o the sagittal plane and we wondered if this angle would be transposable to the anterior acetabular coverage measured in the sagittal plane. Methods Eight hips from four cadaver pelvises were investigated by means of a total of 72 false proWle views, each taken in deWned pelvic inclinations at 5° increments ranging from ¡20° to +20°, and the VCA angle measured by three independent raters. A computed tomography (CT) of each hip was performed in a neutral pelvic tilt position and a sagittal 2D reconstruction calculated in order to measure anterior coverage in the sagittal plane. The interrater reliability of the VCA angles was assessed using the intraclass correlation coeYcient (ICC). The dependence of the VCA angle on pelvic tilt was assessed by regression analysis. The Correlation between the VCA angle and anterior coverage in the sagittal plane of the CT was analyzed using a simple linear regression model. Results The interrater reliability for measurements of the VCA angle was almost perfect (ICC:0.97). Regression analysis showed that each degree of pelvic tilt was accompanied by a change of the VCA angle by a value of 0.63°( P < 0.001). A low correlation between the VCA angle measured in the false proWle view and the anterior coverage in the sagittal plane was statistically not signiWcant (r = 0.667, P = 0.06). Conclusions Lequesne's VCA angle has an excellent interrater reliability and represents a reliable measure of acetabular dysplasia for comparisons with published data. Lequesne's VCA angle is inXuenced by pelvic tilt in a linear manner. Performing the false proWle view in a standing position may reduce the clinical relevance of this dependency on pelvic tilt. The correlation of Lequesne's VCA angle to anterior acetabular coverage in the sagittal plane is low and therefore unsuitable to be transposed into the sagittal plane.

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Section: Discussionsupporting

confidence: 74%