Kim Mimi, Lee Seunghun, Lee Bong Gun, Paik Doo-Jin, Bae Jiyoon
From the Departments of *Radiology, †Orthopaedic Surgery, and ‡Anatomy and Cell Biology, Hanyang University Seoul Hospital, Korea; §Department of Pathology, National Police Hospital, Seoul, Korea.
J Comput Assist Tomogr. 2014 Jul-Aug;38(4):503-6. doi: 10.1097/RCT.0000000000000089.
The purposes of our study were to analyze magnetic resonance imaging (MRI) and cadaveric findings concerning the medial synovial fold of the posterior cruciate ligament (PCL) and to classify the types of fold according to anatomic location.
Two musculoskeletal radiologists reviewed MR images of 17 cadaveric knees to classify the types of medial fold of the PCL by consensus. The MRI types were divided into 3 groups. In type A, there was no definitive medial fold; and in type B, inferior-short type, there was a small protrusion of the medial border. Type C, inferior-long type, had a long enough fold to exceed the imaginary line, which is connecting between the medial tibial condyle and posterolateral aspect of the medial femoral condyle. Correlations were sought between the findings derived from the MRI studies and cadaveric dissections. Histologic analyses of the medial fold were also performed.
On MRI, the most common type of medial fold was type B (76.4%), followed by type C (11.8%) and type A (11.8%). In the cadaveric investigation, the medial folds of both types B and C were found to project into the medial femorotibial joint. Moreover, there was also a protruding medial fold at the superior aspect of the PCL in the A. Histologic examination of the medial folds revealed collagenous tissue surrounded by synovial cells.
Medial folds of the PCL are normal synovial structures that can be seen by MRI and in cadaveric studies in a large proportion of the population.
本研究旨在分析有关后交叉韧带（PCL）内侧滑膜皱襞的磁共振成像（MRI）及尸体解剖结果，并根据解剖位置对皱襞类型进行分类。
两名肌肉骨骼放射科医生共同审查了17具尸体膝关节的MR图像，以对PCL内侧皱襞的类型达成共识并进行分类。MRI类型分为3组。A型为无明确的内侧皱襞；B型为下短型，内侧缘有小的突起；C型为下长型，有足够长的皱襞超过连接内侧胫骨髁与内侧股骨髁后外侧的假想线。研究了MRI研究结果与尸体解剖结果之间的相关性。还对内侧皱襞进行了组织学分析。
在MRI上，最常见的内侧皱襞类型是B型（76.4%），其次是C型（11.8%）和A型（11.8%）。在尸体解剖研究中，发现B型和C型的内侧皱襞均突入内侧股胫关节。此外，A型在PCL上方也有一个突出的内侧皱襞。内侧皱襞的组织学检查显示为被滑膜细胞包围的胶原组织。
PCL的内侧皱襞是正常的滑膜结构，在MRI及尸体研究中，在很大一部分人群中都能看到。
