基于髋关节磁共振关节造影的三维测量方法对股骨髋臼撞击症的分型。
A three-dimensional measurement method on MR arthrography of the hip to classify femoro-acetabular impingement.
机构信息
Department of Experimental and Clinical Biomedical Sciences, Radiodiagnostic Unit N. 2, University of Florence-Azienda Ospedaliero-Universitaria Careggi, Largo Brambilla 3, 50134, Florence, Italy.
Radiology Unit, Orthopaedic Traumatologic Center, University of Florence-Azienda Ospedaliero-Universitaria Careggi, Largo Palagi 1, 50134, Florence, Italy.
出版信息
Jpn J Radiol. 2021 Dec;39(12):1175-1185. doi: 10.1007/s11604-021-01162-0. Epub 2021 Jun 28.
PURPOSE
(1) To investigate correlations between different types of FAI and the ratio of acetabular volume (AV) to femoral head volume (FV) on MR arthrography. (2) To assess 2D/3D measurements in identifying different types of FAI by means of cut-off values of AV/FV ratio (AFR).
MATERIALS AND METHODS
Alpha angle, cranial acetabular version, acetabular depth, lateral center edge angle, AV, and FV of 52 hip MR arthrography were measured. ANOVA test correlated different types of FAI with AFR. ROC curves classified FAI by cut-off values of AFR. Accuracy of 2D/3D measurements was calculated.
RESULTS
ANOVA test showed a significant difference of AFR (p value < 0.001) among the three types of FAI. The mean values of AFR were 0.64, 0.74, and 0.89 in cam, mixed, and pincer types, respectively. Cut-off values of AFR were 0.70 to distinguish cam types from mixed and pincer types, and 0.79 to distinguish pincer types from cam and mixed types. Cut-off values identified 100%, 73.9%, and 55.6% of pincer, cam, and mixed types. 2D and 3D classifications of FAI showed accuracy of 40.4% and 73.0%.
CONCLUSIONS
3D measurements were clearly more accurate than 2D measurements. Distinct cut-off values of AFR discriminated cam types from pincer types and identified pincer types in all cases. Cam and mixed types were not accurately recognized.
目的
（1）研究磁共振关节造影不同类型的髋臼前壁撞击（FAI）与髋臼容积（AV）与股骨头容积（FV）比值的相关性。（2）通过髋臼容积/股骨头容积比值（AV/FV 比）的截断值评估 2D/3D 测量在识别不同类型 FAI 中的作用。
材料和方法
对 52 例髋关节磁共振关节造影的阿尔法角、髋臼前倾角、髋臼深度、外侧中心边缘角、AV 和 FV 进行测量。方差分析（ANOVA）检验不同类型 FAI 与 AV/FV 比（AFR）的相关性。ROC 曲线根据 AFR 的截断值对 FAI 进行分类。计算 2D/3D 测量的准确性。
结果
ANOVA 检验显示，三种类型的 FAI 的 AFR 存在显著差异（p 值<0.001）。凸轮、混合和钳夹型的 AFR 平均值分别为 0.64、0.74 和 0.89。AFR 的截断值为 0.70 可区分凸轮型与混合和钳夹型，0.79 可区分钳夹型与凸轮和混合型。截定点识别出 100%、73.9%和 55.6%的钳夹型、凸轮型和混合型。2D 和 3D 分类的 FAI 的准确性分别为 40.4%和 73.0%。
结论
3D 测量明显比 2D 测量更准确。明显的 AFR 截断值可区分凸轮型与钳夹型，并可在所有情况下识别出钳夹型。但凸轮型和混合型不能被准确识别。
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