Xu Zhihong, Chen Dongyang, Shi Dongquan, Dai Jin, Yao Yao, Jiang Qing
Department of Orthopaedics, The Affiliated Drum Tower Hospital of Nanjing University Medical School, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China.
Knee Surg Sports Traumatol Arthrosc. 2016 Mar;24(3):909-14. doi: 10.1007/s00167-014-3425-3. Epub 2014 Nov 22.
Hypoplasia of the lateral femoral condyle has been reported in discoid lateral meniscus patients, but associated imaging findings in the axial plane have not been characterized. In this study, we aimed to identify differences in the lateral femoral condyle between patients with discoid lateral meniscus and those with normal menisci using axial MRI images.
Twenty-three patients (24 knees) with complete discoid lateral meniscus, 43 (45 knees) with incomplete discoid lateral meniscus, and 50 with normal menisci (50 knees) were enrolled and distributed into three groups. Two new angles, posterior lateral condylar angle (PLCA) and posterior medial condylar angle (PMCA), were measured on axial MRI images; the posterior condylar angle (PCA) was also measured. Differences between the three groups in the PLCA, PMCA, PCA, and PLCA/PMCA were analysed. The predictive value of PLCA and PLCA/PMCA for complete discoid lateral meniscus was assessed.
In the complete discoid lateral meniscus group, PLCA and PLCA/PMCA were significantly smaller compared with the normal meniscus group and the incomplete discoid lateral meniscus group (P < 0.001). A significantly larger PCA was identified in the complete discoid lateral meniscus group compared with the incomplete discoid lateral meniscus group (P < 0.05) and normal meniscus group (P < 0.05). Both PLCA and PLCA/PMCA showed excellent predictive value for complete discoid lateral meniscus.
Hypoplasia of the posterior lateral femoral condyle is typically seen in patients with complete discoid lateral meniscus. PLCA and PLCA/PMCA can be measured from axial MRI images and used as excellent predictive parameters for complete discoid lateral meniscus.
Diagnostic study, Level III.
据报道，盘状外侧半月板患者存在股骨外侧髁发育不全，但尚未对轴面相关影像学表现进行特征描述。在本研究中，我们旨在利用轴位MRI图像，确定盘状外侧半月板患者与正常半月板患者在股骨外侧髁方面的差异。
纳入23例（24个膝关节）完全型盘状外侧半月板患者、43例（45个膝关节）不完全型盘状外侧半月板患者以及50例正常半月板患者（50个膝关节），并将其分为三组。在轴位MRI图像上测量两个新角度，即后外侧髁角（PLCA）和后内侧髁角（PMCA）；同时测量后髁角（PCA）。分析三组在PLCA、PMCA、PCA及PLCA/PMCA方面的差异。评估PLCA和PLCA/PMCA对完全型盘状外侧半月板的预测价值。
在完全型盘状外侧半月板组中，与正常半月板组和不完全型盘状外侧半月板组相比，PLCA和PLCA/PMCA显著更小（P < 0.001）。与不完全型盘状外侧半月板组（P < 0.05）和正常半月板组（P < 0.05）相比，完全型盘状外侧半月板组的PCA显著更大。PLCA和PLCA/PMCA对完全型盘状外侧半月板均显示出优异的预测价值。
完全型盘状外侧半月板患者通常可见股骨后外侧髁发育不全。PLCA和PLCA/PMCA可通过轴位MRI图像测量，用作完全型盘状外侧半月板的优异预测参数。
诊断性研究，III级。
