Herman L J, Beltran J
Department of Radiology, Ohio State University Hospitals, Columbus 43210.
Radiology. 1988 Jun;167(3):775-81. doi: 10.1148/radiology.167.3.3363139.
Discrepancies between the findings of magnetic resonance (MR) imaging and those of arthroscopy were reviewed retrospectively in 52 knee examinations. Some of the discrepancies between MR imaging and arthroscopy were caused by errors in interpretation of MR images due to normal structures that mimicked meniscal tears. The transverse ligament and the lateral inferior genicular artery can produce the appearance of tears in the anterior horns of the medial and lateral menisci, respectively. The popliteus tendon may be mistaken for a tear in the posterior horn of the lateral meniscus. The normal concavity at the outer edge of the meniscus can create a volume-averaging artifact, which mimics a horizontal tear in the meniscus. Tears of the meniscus and separations of the meniscus from the joint capsule were not seen or were underestimated when the tears were oriented parallel to the plane of the image. An awareness of these pitfalls may improve the accuracy of the interpretation of MR images of the knee.
对52例膝关节检查的磁共振成像（MR）结果与关节镜检查结果之间的差异进行了回顾性分析。MR成像与关节镜检查之间的一些差异是由于正常结构模拟半月板撕裂而导致MR图像解读错误所致。横韧带和膝下外侧动脉可分别在内侧和外侧半月板前角产生撕裂的假象。腘肌腱可能被误认为是外侧半月板后角的撕裂。半月板外缘的正常凹陷可产生容积平均伪影，模拟半月板的水平撕裂。当撕裂方向与图像平面平行时，半月板撕裂和半月板与关节囊分离未被发现或被低估。了解这些陷阱可能会提高膝关节MR图像解读的准确性。
