The anterior center edge angle: a study of 102 volunteers

Milcan, Abtullah; Yıldız, Altan; Öztuna, Volkan; Eskandari, Metin Manouchehr; Şahin, Günşah; Kuyurtar, Fehmi

doi:10.1016/s1297-319x(03)00121-0

Cited by 13 publications

(14 citation statements)

References 7 publications

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“…In Lequesne's original description, the sclerotic zone of the acetabulum only (i.e., without marginal osteophytes) is taken into consideration for VCA angle measurements. This was not the case in Milcan's [7] and Crockarell's [2] study and may be an explanation for this discrepancy. Nevertheless, the normal values proposed by Milcan and Crockarrell diVered signiWcantly from each other (17.7° vs. 24.75°) despite using an identical technique.…”

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confidence: 64%

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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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confidence: 64%

“…A VCA angle greater than 25° is widely accepted to be normal, whereas less than 20° abnormal [6], corresponding to acetabular dysplasia. Other investigators have disagreed on these normal values [2,7]. However, they did not use exactly the same imaging protocol.…”

mentioning

confidence: 99%

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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“…The VCA angle has been reported to be useful for geometric evaluation of anterior coverage in normal hips with a CE greater than 25° [2,4,12] and radiographic evaluation of early osteoarthritic changes at the anterior portion in patients with osteoarthritis of the hip. However, the VCA angle has not been reported to be useful for quantitative evaluation of anterior coverage in dysplastic hips or borderline hips.…”

Section: Introductionmentioning

confidence: 99%

Is Vertical-center-anterior Angle Equivalent to Anterior Coverage of the Hip?

Sakai¹,

Nishii²,

Sugamoto³

et al. 2009

Clinical Orthopaedics &Amp; Related Research

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“…However, 2D CTbased methods have not been standardized, and the literature is limited for 3D studies [34,35]. We found the AA, LCEA, ACEA, and PCEA to be 35°, 40°, 62°, and 105°, respectively, which according to known normal radiographic values indicate over-coverage [22,[32][33][34]. Furthermore, these values are consistent with the sex-and age-specific study by Miyasaka et al, in which subjects aged ≥ 50 years showed over-coverage [33].…”

Section: Discussionmentioning

confidence: 78%

“…Acetabular coverage of the femoral head was defined by the AA, LCEA, ACEA, and PCEA. These variables have been extensively studied using plain radiography, and their normal values are well defined for diagnosing acetabular over-coverage and hip dysplasia [22,[32][33][34]. However, 2D CTbased methods have not been standardized, and the literature is limited for 3D studies [34,35].…”

Section: Discussionmentioning

confidence: 99%

Structural risk factors for low-energy acetabular fractures

Gebre

Hirvasniemi

Lantto

et al. 2019

Bone

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In this study, we aimed to clarify proximal femur and acetabular structural risk factors associated with low-energy acetabular fractures in the elderly using three-dimensional (3D) computed tomography (CT). Pelvic bones and femurs were segmented and modeled in 3D from abdominopelvic CT images of 121 acetabular fracture patients (mean age 72±12 years, range 50-98 years, 31 females and 90 males) and 121 age-gender matched controls with no fracture. A set of geometric parameters of the proximal femur and the acetabulum was measured. An independentsamples t-test or a Mann-Whitney U-test was used for statistical analyses. The fractured side was used for proximal femur geometry, while the contralateral side was used for acetabular geometry. The neck shaft angle (NSA) was significantly smaller (mean 122.1° [95% CI 121.1°-123.2°] vs. 124.6° [123.6°-125.6°], p = 0.001) and the femoral neck axis length (FNALb) was significantly longer (78.1 mm [77.0-79.2 mm] vs. 76.0 mm [74.8-77.2 mm], p = 0.026) in the fracture group than in the controls when genders were combined. The NSA was significantly smaller both for females (120.2° [117.8°-122.6°] vs. 124.7° [122.5°-127.0°], p = 0.007) and for males (122.7° [121.5°-123.8°] vs. 124.6° [123.4°-125.7°], p = 0.006) in the fracture group. However, only males showed a significantly longer FNALb (80.0 mm [78.9-81.1 mm] vs. 77.8 mm [76.6-79.0 mm], p = 0.025). No statistically significant associations of acetabular geometry with fractures were found. However, the mean values of the acetabular angle of Sharp (34°), the lateral center-edge angle (40°), the anterior center-edge angle (62°), and the posterior center-edge angle (105°) indicated possible over-coverage. In conclusion, our findings suggest that proximal femur geometry is associated with low-energy acetabular fractures. Especially elderly subjects with an NSA smaller than normal have an increased risk of acetabular fractures.

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The anterior center edge angle: a study of 102 volunteers

Cited by 13 publications

References 7 publications

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

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

Is Vertical-center-anterior Angle Equivalent to Anterior Coverage of the Hip?

Structural risk factors for low-energy acetabular fractures

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