Araki Y, Yamamoto H, Nakamura H, Tsukaguchi I
Department of Radiology, Osaka Rosai Hospital, Japan.
Eur J Radiol. 1994 May;18(2):92-5. doi: 10.1016/0720-048x(94)90271-2.
To establish explicit criteria for MR imaging diagnosis of discoid lateral menisci of the knee.
Materials included surgically proved 38 discoid lateral menisci and 36 normal lateral menisci of adult patients. A discriminant analysis was used to identify the optimal cut-off points of the following eight parameters: (1) transverse width of a lateral meniscus on the coronal image at the midportion of a meniscal body; (2) ratio of transverse width between a lateral meniscus and a tibia; (3) height of the lateral margin of a lateral meniscus; (4) difference in height between lateral and medial menisci; (5) transverse area of a lateral meniscus; (6) the number of consecutive sagittal slices demonstrating continuity of the meniscus between the anterior and posterior horns (bow tie appearance); (7) height of the anterior horn of a lateral meniscus on the sagittal image; (8) height of the posterior horn of a lateral meniscus on the same sagittal image.
The transverse width of a lateral meniscus on the coronal image was the best parameter, with a cut-off point of 14 mm. Using this criterium, 33 knees of 38 discoid lateral menisci and all 36 normal menisci were correctly identified, yielding an overall accuracy of 93%.
A discoid lateral meniscus should be present if the transverse width of a lateral meniscus at the midportion of a meniscal body exceeds 14 mm, independent of the tibial width.
建立膝关节盘状外侧半月板的磁共振成像（MR）诊断明确标准。
材料包括经手术证实的38例成人患者的盘状外侧半月板和36例正常外侧半月板。采用判别分析确定以下八个参数的最佳截断点：（1）半月板体中部冠状面上外侧半月板的横向宽度；（2）外侧半月板与胫骨的横向宽度比；（3）外侧半月板外侧缘的高度；（4）外侧半月板与内侧半月板高度差；（5）外侧半月板的横截面积；（6）显示半月板前后角之间连续性的连续矢状面切片数量（领结样外观）；（7）矢状面上外侧半月板前角的高度；（8）同一矢状面上外侧半月板后角的高度。
冠状面上外侧半月板的横向宽度是最佳参数，截断点为14mm。采用该标准，38例盘状外侧半月板中的33个膝关节及所有36个正常半月板均被正确识别，总准确率为93%。
如果半月板体中部外侧半月板的横向宽度超过14mm，且与胫骨宽度无关，则应存在盘状外侧半月板。
