Kumasaka Y, Harada K, Watanabe H, Higashihara T, Kishimoto H, Sakurai K, Kozuka T
Department of Radiology, Kansai Rosai Hospital, Hyogo, Japan.
Pediatr Radiol. 1991;21(3):208-10. doi: 10.1007/BF02011050.
On radiographs flattening of the femoral head is evaluated by the Epiphyseal Index (EI). Using the ability of MRI to show articular cartilage and the physis clearly, we wish to propose the use of an Epiphyseal Index for MRI (EIM) and demonstrate the value in LCPD. Fifteen patients were examined using 1.5T MR scanner and T1-weighted coronal images were obtained. EIM was calculated as a ratio of height and width of cartilaginous contour surrounding epiphysis, and was compared between normal and the three radiographic stages. EIM of normal hips were ranged from 0.39 to 0.60 and had a tendency to decrease with increasing age. All cases of Stage 1 (avascular necrosis) were within the normal range (n = 4, mean = 0.51, SD = 0.045). EIM of Stage 2 (fragmentation, n = 15, mean = 0.31, SD = 0.055) were smaller than that of Stage 1. Stag 2 and 3 (residual, n = 12, mean = 0.31, SD = 0.077) could not be distinguished by EIM. EIM was useful to show the flattening of epiphysis with growth and very important for differentiation between Stage 1 and 2 LCPD.
在X线片上，通过骨骺指数（EI）评估股骨头的扁平情况。利用MRI清晰显示关节软骨和骨骺板的能力，我们希望提出一种用于MRI的骨骺指数（EIM），并证明其在儿童股骨头缺血性坏死（LCPD）中的价值。使用1.5T MR扫描仪对15例患者进行检查，并获得T1加权冠状位图像。EIM计算为骨骺周围软骨轮廓的高度与宽度之比，并在正常组和三个X线分期之间进行比较。正常髋关节的EIM范围为0.39至0.60，且有随年龄增长而降低的趋势。所有1期（缺血性坏死）病例均在正常范围内（n = 4，平均值 = 0.51，标准差 = 0.045）。2期（碎裂，n = 15，平均值 = 0.31，标准差 = 0.055）的EIM小于1期。2期和3期（残留，n = 12，平均值 = 0.31，标准差 = 0.077）无法通过EIM区分。EIM有助于显示骨骺随生长的扁平情况，对于区分1期和2期LCPD非常重要。
