Patten R M, Richardson M L, Zink-Brody G, Rolfe B A
Department of Radiology, University of Washington School of Medicine, Seattle.
J Comput Assist Tomogr. 1994 Sep-Oct;18(5):793-9.
We sought to define the MRI appearance of both complete and partial-thickness tears of the posterior cruciate ligament (PCL) and to describe patterns of injury and associated MRI findings.
Three radiologists retrospectively reviewed MR images and medical records on 32 patients with PCL tears (15 complete, 17 partial) and correlated MRI findings to results of clinical testing and surgery.
The PCL had indistinct margins in 27 (84%) of 32 patients and was abnormally thick in 25 (78%) patients. In 31 (97%) patients, the torn PCL showed increased signal intensity on both T1- and T2-weighted pulse sequences. Although there was no statistically significant difference between patients with complete tears and those with partial tears with regard to thickness, margination, and signal intensity of the PCL, MR images in patients with complete tears were more likely to show focal areas of ligamentous discontinuity (10 of 15 cases) (p = 0.01). Associated knee injuries were seen in 21 (66%) patients and were seen more frequently in patients with complete PCL tears (p = 0.015). Bony injury (n = 11, 34%) and tears of the medial collateral ligament (n = 13, 41%) and menisci (n = 10, 31%) were common. No specific pattern of bony injury was found.
Posterior cruciate ligament tears can be diagnosed readily by multiplanar MRI using both morphological and signal intensity characteristics. Although differentiation between complete and partial-thickness PCL tears by MRI criteria alone is more problematic, complete tears are more likely to show focal areas of discontinuity and partial tears are more likely to show at least some intact fibers.
我们试图明确后交叉韧带（PCL）完全撕裂和部分撕裂的MRI表现，并描述损伤模式及相关MRI表现。
三位放射科医生回顾性分析了32例PCL撕裂患者（15例完全撕裂，17例部分撕裂）的MR图像和病历，并将MRI表现与临床检查及手术结果进行关联。
32例患者中有27例（84%）PCL边缘不清，25例（78%）PCL异常增厚。31例（97%）患者撕裂的PCL在T1加权和T2加权脉冲序列上均表现为信号强度增加。尽管在PCL的厚度、边缘清晰度和信号强度方面，完全撕裂患者与部分撕裂患者之间无统计学显著差异，但完全撕裂患者的MR图像更易显示韧带连续性的局灶性区域（15例中有10例）（p = 0.01）。21例（66%）患者存在相关的膝关节损伤，且在PCL完全撕裂患者中更常见（p = 0.015）。常见的损伤包括骨损伤（n = 11，34%）、内侧副韧带撕裂（n = 13，41%）和半月板撕裂（n = 10，31%）。未发现特定的骨损伤模式。
利用形态学和信号强度特征，多平面MRI可轻松诊断后交叉韧带撕裂。尽管仅根据MRI标准区分PCL完全撕裂和部分撕裂更具挑战性，但完全撕裂更易显示连续性中断的局灶性区域，部分撕裂更易显示至少一些完整纤维。
