Lee J K, Yao L, Phelps C T, Wirth C R, Czajka J, Lozman J
Department of Diagnostic Radiology, Albany Medical College, NY 12208.
Radiology. 1988 Mar;166(3):861-4. doi: 10.1148/radiology.166.3.3340785.
Seventy-nine magnetic resonance (MR) studies of the knee were reviewed in an evaluation of the ability of MR imaging to demonstrate arthroscopically proved anterior cruciate ligament (ACL) tears. MR findings were also compared with the findings of two commonly applied clinical tests of ACL instability: the Lachman test and the anterior drawer test. The sensitivity of MR imaging was 94% (17 of 18), compared with 78% (14 of 18) for the anterior drawer test and 89% (16 of 18) for the Lachman test. The specificity was 100% for all three. Three MR criteria were applied: irregularity or a wavy contour of the anterior margin of the ligament, high-signal-intensity change within the substance of the ligament on T2-weighted images, and discontinuity of that substance. The sagittal T2-weighted image was especially helpful, producing an "arthrographic" effect, in which the anterior margin of the ACL is outlined by high-signal-intensity joint fluid. By demonstrating ACL and other extrameniscal lesions, MR imaging may help clarify the mechanisms of knee injury.
为评估磁共振成像（MR）显示经关节镜证实的前交叉韧带（ACL）撕裂的能力，回顾了79例膝关节的MR研究。还将MR检查结果与两种常用的ACL不稳定临床检查结果进行了比较：Lachman试验和前抽屉试验。MR成像的敏感性为94%（18例中的17例），前抽屉试验为78%（18例中的14例），Lachman试验为89%（18例中的16例）。三者的特异性均为100%。应用了三个MR标准：韧带前缘不规则或呈波浪状轮廓、T2加权图像上韧带实质内高信号强度改变以及韧带实质连续性中断。矢状面T2加权图像特别有用，产生一种“关节造影”效果，其中ACL前缘由高信号强度的关节液勾勒出来。通过显示ACL和其他半月板外病变，MR成像可能有助于阐明膝关节损伤的机制。
