CT false-profile view of the hip: a reproducible method of measuring anterior acetabular coverage using volume CT data

Needell, Steven D.; Borzykowski, Ross M.; Carreira, Dominic S.; Kozy, John

doi:10.1007/s00256-014-1949-8

Cited by 13 publications

(9 citation statements)

References 24 publications

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“…3 ). The VCA angle was measured in a 25° oblique sagittal plane of the hip center according to the method described by Needell et al [ 14 ] (Fig. 4 ).…”

Section: Methodsmentioning

confidence: 99%

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Multiplanar evaluation of radiological findings associated with acetabular dysplasia and investigation of its prevalence in an Asian population: a CT-based study

Mimura

Mori

Kitagawa

et al. 2017

BMC Musculoskelet Disord

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BackgroundAcetabular dysplasia (AD) is a well-known cause of osteoarthritis (OA) of the hip, with its prevalence previously determined on plain radiography. The prevalence of preexisting AD was reported as 7.3% in a patient-based Asian population. Although computed tomography (CT) could evaluate AD in multiple planes, its prevalence using multiplanar CT images has not been reported. We investigated its prevalence with CT on coronal, axial, and sagittal planes and then determined if adding the axial and sagittal planes enhanced the investigation.MethodsWe retrospectively examined 52 consecutive Japanese individuals (mean age 59.4 years) who had undergone CT for conditions unrelated to hip disorders. The inclusion criteria of CT images were (1) reconstructed axial slice thickness of ≤1 mm and (2) normal pelvic rotations and tilt. Exclusion criteria were (1) age <20 years, (2) neither hip center could be clearly detected, (3) evidence of hip OA. The parameters used to define AD on the coronal plane were the center–edge angle, Sharp angle, acetabular index, acetabular depth ratio, and acetabulum head index. The anterior and posterior acetabular sector angles were used as axial parameters and the vertical-center-anterior margin angle as the sagittal parameter. AD prevalence was calculated using multiplanar images and then compared with the previously reported Asian prevalence using 95% confidence intervals (CI). In this study, we defined “prevalence” as the proportion of subjects who had AD in at least one hip.ResultsThe mean prevalence of AD on coronal, axial, and sagittal planes was 16.9, 15.4, and 7.7%, respectively. The lowest prevalence found by combining the three planes was 25.0% (95% CI 15.2–38.2%). This prevalence was significantly higher than that in the previously reported Asian population (7.3%).ConclusionsAt the lowest estimate, the prevalence of AD evaluated in three planes was more than twice as high as the previously reported prevalence in Asians when we investigated its prevalence using multiplanar images. The prevalence of AD in the axial and sagittal planes was not negligible. We therefore suggest that it is important to add axial and sagittal planes’ data when investigating the prevalence of AD.

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“…3 ). The VCA angle was measured in a 25° oblique sagittal plane of the hip center according to the method described by Needell et al [ 14 ] (Fig. 4 ).…”

Section: Methodsmentioning

confidence: 99%

“…4 Measurement of the vertical-center-anterior margin (VCA) angle on the sagittal plane. The VCA angle is measured according to the method of Needell et al [ 14 ]. a Reference standard axial plane for measuring the VCA angle.…”

Section: Methodsmentioning

confidence: 99%

Multiplanar evaluation of radiological findings associated with acetabular dysplasia and investigation of its prevalence in an Asian population: a CT-based study

Mimura

Mori

Kitagawa

et al. 2017

BMC Musculoskelet Disord

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“…Hips in which the anterior wall/femoral head overlap is <20% of the femoral head diameter are concerning for anterior instability. A more reproducible method of assessing anterior acetabular coverage is with a CT false-profile view 34 . This method produces a cross-sectional image in the same obliquity as false-profile radiographs and eliminates projectional errors.…”

Section: Radiographic Characterizationmentioning

confidence: 99%

Hip instability: a review of hip dysplasia and other contributing factors

Kraeutler

Garabekyan

Pascual-Garrido

et al. 2019

Muscle Ligaments and Tendons J

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Background: Hip instability has classically been associated with developmental dysplasia of the hip (DDH) in newborns and children. However, numerous factors may contribute to hip instability in children, adolescents, and adults. Purpose: This review aims to concisely present the literature on hip instability in patients of all ages in order to guide health care professionals in the appropriate diagnosis and treatment of the various disorders which may contribute to an unstable hip. Methods: We reviewed the literature on the diagnosis and surgical management of hip dysplasia and other causes of hip instability. Conclusions: Multiple intra-and extra-articular variables may contribute to hip instability, including acetabular bony coverage, femoral torsion, femoroacetabular impingement, and soft tissue laxity. Physical examination and advanced imaging studies are essential to accurately diagnose the pathology contributing to a patient's unstable hip. Conservative management, including activity modification and physical therapy, may be used as a first-line treatment in patients with intra-articular hip pathology. Patients who continue to experience symptoms of pain or instability should proceed with arthroscopic or open surgical treatment aimed at correcting the underlying pathology. Level of evidence: V. KEY WORDS: developmental dysplasia of the hip, femoral anteversion, femoroacetabular impingement, hip instability, periacetabular osteotomy.

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“…[13][14][15] Unfortunately, unlike many radiographic parameters such as the LCEA, 17,18 the ACEA on a CT or MRI sagittal image is not in full agreement with the ACEA on false profile radiography. 18,19 Some have advocated using special 3D reformatting to mimic false profile radiographs 20 or to utilise proprietary software to assess the anterior coverage on CT. 21 The need of special 3D reformatting and/or proprietary software greatly reduces the clinical application of these measurements. Measuring ACEA on a sagittal CT would not require any additional reformatting or software and would allow for adjustment for pelvic tilt similar to the adjustment of pelvic inclination in measuring the LCEA.…”

Section: Introductionmentioning

confidence: 99%

Anterior centre-edge angle on sagittal CT: a comparison of normal hips to dysplastic hips

et al. 2018

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CT false-profile view of the hip: a reproducible method of measuring anterior acetabular coverage using volume CT data

Cited by 13 publications

References 24 publications

Multiplanar evaluation of radiological findings associated with acetabular dysplasia and investigation of its prevalence in an Asian population: a CT-based study

Multiplanar evaluation of radiological findings associated with acetabular dysplasia and investigation of its prevalence in an Asian population: a CT-based study

Hip instability: a review of hip dysplasia and other contributing factors

Anterior centre-edge angle on sagittal CT: a comparison of normal hips to dysplastic hips

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