股骨头颈直径比的MSCT测量

目的:应用CT多平面重组图像测量股骨头颈直径比的正常值,比较两种测量方法(利用平行于股骨颈的斜正中矢状面和利用髋关节标准冠状面图像)的差异。方法:筛选行骨盆或下腹CT检查而无任何髋部症状的101例成人的202个髋关节的容积CT数据进行MPR后处理,其中男性髋112个、女性髋90个。选取平行于股骨颈斜正中矢状面和标准冠状面MPR图像,通过Digmizer V3.1软件分别进行股骨头、颈的直径测量并计算两者的比值。结果:利用斜正中矢状面MPR图像测量股骨头颈直径比为1.12～2.17,平均值为1.78±0.14;男性平均值为1.77±0.14,女性平均值为1.80±0.14,性别差异无统计学意义(t=-1.490,P>0.05);右侧平均值为1.81±0.12,左侧为1.75±0.15。利用冠状面MPR图像测量股骨头颈直径比为1.07～1.83,平均值为1.46±0.10;男性平均值为1.45±0.12,女性平均值为1.48±0.09;右侧平均值为1.46±0.11,左侧为1.46±0.10,左右侧的差异无统计学意义(t=0.008,P>0.05)。两种测量方法所得的202个股骨头颈直径比的平均值的差异有统计学意义(F=656.102,P<0.001)。结论:利用平行于股骨颈的斜正中矢状面MPR图像测量股骨头颈直径比较利用冠状面MPR图像测量方法能更真实地反映股骨头颈交界处的凹陷程度,可为诊断凸轮型撞击综合征提供一定的参考依据。

Measurement of the ratio of normal femur head and neck diameters by multi-slice CT

Objective：To measure the ratio of normal femur head and neck diameters with multiplanar CT （MSCT） using multiple plane reformation （MPR） post-processing technique. Oblique-median sagittal plane paralleling femur neck and standard coronal plane were used separately,and their differences were compared. Methods.. The CT data of totally 101 adults （202 hip joints） without any symptoms of hip joint underwent low abdomen or pelvis CT were used for this study and posvprocessed with MPR technique. There were male,n=112 hips and female,n=90 hips. The ratio of femur head and neck diameters was measured by oblique-median sagittal plane paralleling femur neck and standard coronal plane using Dig mizer V3.1 software, and the results were analyzed statistically. Results： The ratio in measured with oblique-median sagittal plane paralleling femur neck was 1.12 - 2.17 （mean value 1.78 ± 0.14） ;the mean value of male and female was 1.77 ± 0.14 and 1.80± 0.14 respectively, no statistic significance was found between the two sexes （t=- 1. 490, P〉0.05）. The mean value of right and left hip was 1.81±0. 12 and 1.75± 0.15 respectively. The ratio in standard coronal plane was 1.07 1.83 （mean value 1.46±0.10） ;the mean value of male and female was 1.45±0.12 and 1.48±0.09 respectively;the mean value of right and left hip was 1.46±0.11 and 1.46 ± 0.10 respectively, with no significant statistical difference （t= 0. 008, P〉0.05）. There was significant statistical differences between the measurements with the two planes （F=656. 102, P〈 0. 001）. Conclusion：The degree of depression level of the junction of femur head and neck could be displayed more reliably by using oblique median sagittal plane paralleling femur neck compared with that of standard coronal plane, which could provide certain reference to the diagnosis of femoroacetabular impingement syndrome.