Prevalence of pincer, cam, and combined deformities in Japanese hip joints evaluated with the Japanese Hip Society diagnostic guideline for femoroacetabular impingement: A CT-based study

Mimura, Tomohiro; Mori, Kanji; Itakura, Shin; Furuya, Yuki; Kawasaki, Taku; Imai, Shunsuke

doi:10.1016/j.jos.2016.09.010

Cited by 14 publications

(8 citation statements)

References 26 publications

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“…Considering these different AASA and PASA results in men and women, in our study the male acetabulum was significantly more retroverted than that in women. These results are in line with those in previous reports, which showed that a retroverted acetabulum was detected in men significantly more often than in women [ 29 , 30 ]. In other words, it is suggested that there is posterior undercoverage of the acetabulum in men and anterior undercoverage in women.…”

Section: Discussionsupporting

confidence: 93%

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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Section: Discussionsupporting

confidence: 93%

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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“…However, we do not think this is the case since our CT radiologist has > 30 years of clinical experience in musculoskeletal radiology; she only measured to the acetabular edge and our measurements were generally lower than those on the younger patients from the two other studies. The patient selection may also have affected the measurements, because we did not exclude patients with borderline hip dysplasia (CE angle = 20–25°) coxa profunda or pincer morphology since these are highly prevalent conditions in the general population (11,16–18). Tallroth et al.…”

Section: Discussionmentioning

confidence: 99%

Reference values and variation of acetabular angles measured by computed tomography in 170 asymptomatic hips

et al. 2019

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Background We have little knowledge of reference values for acetabular angles. Purpose The purpose of this study was to report values and variation for the center-edge (CE), the acetabular-index (AI), the anterior-sector (AASA), the posterior-sector (PASA), and the acetabular-anteversion angle (AcAV) and to investigate gender differences. Material and Methods Retrospectively, we recruited 96 individuals, 52 women (mean age = 63 ± 12 years) who had undergone computed tomography (CT) as part of examination for lymphomas in 2013 at Aarhus University Hospital. After CT, the participants completed the Oxford Hip Score. Eight individuals indicated hip problems and three had missing data; those 11 were excluded from the material. The acetabular angles for both hips were measured on CT images by an experienced radiologist. The acetabular angles are reported for right and left hip as mean ± SD degrees and compared women and men with a two-sample t-test. Results The CE angle [right;left] averaged [34±6;35±5]. The AI angle averaged [3±6;1±5]. The AASA averaged [58±7;60±9]. The PASA averaged [94±7;95±7]. The AcAV averaged [18±5;18±5]. The AASA was lower whereas the PASA and the ACAV were higher for women compared to men. Conclusion We found considerable variation in the values for acetabular angles. There were gender differences in the sector angles and for the AcAV. Knowledge of reference values is important when we attempt to diagnose the pathological hip conditions.

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“…Nevertheless, the results of this study indicate that the HP should not be misunderstood as a sign suggesting the high probability of FAI, as opposed to some other studies. 14,18,19) The limitation to be pointed out in this study is the small number of cases. However, the serial changes in bone scan findings were very consistent in all cases.…”

Section: Discussionmentioning

confidence: 95%

“…Nevertheless, the results of this study indicate that the HP should not be misunderstood as a sign suggesting the high probability of FAI, as opposed to some other studies. 14 18 19) …”

Section: Discussionmentioning

confidence: 99%

Serial Changes in Image Findings of Herniation Pits from the First Appearance

et al. 2020

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Herniation pits (HPs) refer to small, round to oval subcortical radiolucency with a thin sclerotic margin, located typically in the proximal anterosuperior quadrant of the femoral neck. Pitt et al. 1) first proposed the term herniation pit to describe this fibrocystic lesion, which has been considered to be the result of mechanical stress from the anterior joint capsule and overlying anterior muscles. The lesion has usually been recognized as incidental and benign, 1-6) but recently several reports have suggested that femoroacetabular impingement (FAI) could be the possible cause of the appearance of an HP. 7-13) Image findings of HPs are well described in most published reports, but the findings on bone scintigrams are variable: some demonstrated increased uptake and some did not. 1,2,4,6-8,14) Some reports included time-dependent changes in the image findings, 4,6,7,11) but no reports described the time point at which the images were taken after the first development of an HP. In this study, we evaluated long-term serial changes in image findings of HPs from the first appearance. METHODS We conducted this study in compliance with the principles of the Declaration of Helsinki. This retrospective case-series study was approved by the Institutional Review Board

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Prevalence of pincer, cam, and combined deformities in Japanese hip joints evaluated with the Japanese Hip Society diagnostic guideline for femoroacetabular impingement: A CT-based study

Cited by 14 publications

References 26 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

Reference values and variation of acetabular angles measured by computed tomography in 170 asymptomatic hips

Serial Changes in Image Findings of Herniation Pits from the First Appearance

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