目的　通过MRI对青少年颈椎椎间盘的测量，为人工间盘设计、置换及椎间盘相关疾病诊治提供理论依据。  方法　用SIGNA MR/1.5T磁共振对40例正常青少年(14~17岁)颈椎间盘矢状位多层面的高度及前后径测量：以颈椎正矢状面为中心，分别向两侧以3 mm为间隔，扫描5组矢状位图像，选择正中层面测量椎间盘中心高度与前后径，由两名MRI副主任医师测量后取平均值。   结果　（1）颈椎间盘前后径为(14.036±1.812) mm，中心高(4.111±0.813) mm；（2）从C2～3到C6～7各组椎间盘前后径和中心高组间比较均无统计学差异（均P＞0.05）。（3）按性别各组椎间盘前后径和中心高组间比较均无统计学差异（均P＞0.05）。   结论　（1）14~17岁青少年颈椎椎间盘高度、前后径各值从C2～7呈渐增趋势，各测量值间无统计学差异。（2）MRI可直观显示青少年颈椎间盘形态，测量数据能够满足人工椎间盘选择需要。

Objective　To provide the theory evidence of artificial disc design, replacement and disc related diseases by measurement of the cervical intervertebral disc of adolescent using MRI.    Method    40 normal adolescent cases were used to measure the height and diameter of the sagittal plane of cervical intervertebral disc by SIGNA MR/1.5T MRI. 5 groups of the sagittal images were scanned with the cervical sagittal versine as the center, respectively to the two sides at intervals of 3 mm. The center height and diameter of intervertebral disc were measured in the center of the middle plane,and finally the average measurement data was chosen from two deputy chief physician of the MRI.    Result     (1) The anterior posterior cervical disc was (14.036±1.812)mm and center height was (4.111±0.813)mm. (2) No statistic difference was found between the center height and diameter from C2～3 to C6～7（P＞0.05）.(3) No statistic difference was found between males and females in the each group of the center height and diameter（P＞0.05）.    Conclusion    (1) The center height and diameter of C2 to C7 vertebrae in teenagers of 14~17 years old. There was no significant difference among the measured values. (2) MRI may directly display the cervical intervertebral disc shape, and the data may meet the the requirement of an artificial disc.