Department of Radiology, Hospital for Joint Diseases, NYU Langone Medical Center, New York, NY 10003, USA.
Radiographics. 2013 May;33(3):E97-E112. doi: 10.1148/rg.333125030.
The hip joint poses unique challenges at magnetic resonance (MR) imaging because of its shape and anatomic position. When conventional imaging planes are used, partial-volume averaging effects may substantially hamper the depiction of cartilage and labral damage at MR imaging. Such effects are most prevalent when the imaging plane is not perpendicular to the curvature of the joint and result in images that poorly depict or fail to depict cartilage and labral conditions. Partial-volume averaging, along with the inherently thin and closely apposed articular cartilage, may be partly to blame for the seemingly disparate reported sensitivities of MR imaging for depicting cartilage damage in the literature, which vary widely depending on whether arthrography was used. Fortunately, the multiplanar capability of MR imaging is not limited to standard anatomic planes. Radial sections, which are obtained perpendicular to the surfaces of the hip joint, provide a true cross section of the cartilage and labrum that conventional planes do not. Radial imaging is a reproducible technique that enhances the morphologic assessment of the articular cartilage and labrum. The additional information it provides is important because early damage occurs in the anterosuperior region of the hip in patients with femoroacetabular impingement.
髋关节在磁共振成像（MR）中因其形状和解剖位置而带来独特的挑战。当使用传统成像平面时，部分容积平均效应可能会严重妨碍在 MR 成像中显示软骨和盂唇损伤。当成像平面不垂直于关节的曲率时，这种效应最为明显，导致图像无法很好地或根本无法显示软骨和盂唇的状况。部分容积平均效应以及关节软骨固有的薄而紧密贴合，可能是导致文献中 MR 成像显示软骨损伤的敏感性似乎存在差异的部分原因，这种差异很大程度上取决于是否使用了关节造影术。幸运的是，MR 成像的多平面能力不仅限于标准解剖平面。与髋关节表面垂直获得的径向切片提供了常规平面无法提供的软骨和盂唇的真实横截面。径向成像技术是一种可重复的技术，可增强对关节软骨和盂唇的形态评估。它提供的额外信息很重要，因为在患有股骨髋臼撞击症的患者中，早期损伤发生在髋关节的前上区域。
