Muhle C, Wiskirchen J, Weinert D, Falliner A, Wesner F, Brinkmann G, Heller M
Department of Diagnostic Radiology, Christian-Albrechts University Kiel, Germany.
Spine (Phila Pa 1976). 1998 Mar 1;23(5):556-67. doi: 10.1097/00007632-199803010-00008.
In vivo flexion-extension magnetic resonance imaging studies of the cervical spine were performed inside a positioning device.
To determine the functional changes of the cervical cord and the subarachnoid space that occur during flexion and extension of the cervical spine in healthy individuals.
As an addition to static magnetic resonance imaging examinations, kinematic magnetic resonance imaging studies of the cervical spine were performed to obtain detailed information about functional aspects of the cervical cord and the subarachnoid space. The results were compared with published data of functional flexion-extension myelograms of the cervical spine.
The cervical spines of 40 healthy individuals were examined in a whole-body magnetic resonance scanner from 50 degrees of flexion to 30 degrees of extension, using a positioning device. At nine different angle positions, sagittal T1-weighted spin-echo sequences were obtained. The images were analyzed with respect to the segmental motion, the diameter of the subarachnoid space, and the diameter of the cervical cord.
The segmental motion between flexion and extension was 11 degrees at C2-C3, 12 degrees at C3-C4, 15 degrees at C4-C5, 19 degrees at C5-C6, and 20 degrees at C6-C7. At flexion, a narrowing of the ventral subarachnoid space of up to 43% and a widening of the dorsal subarachnoid space of up to 89% (compared with the neutral position, 0 degrees) were observed. At extension, an increase in the diameter of the ventral subarachnoid space of up to 9% was observed, whereas the dorsal subarachnoid space was reduced to 17%. At flexion, there was a reduction in the sagittal diameter of the cervical cord of up to 14%, and, at extension, there was an increase of up to 15%, compared with the neutral position (0 degrees; these values varied depending on the cervical segment. Statistically significant differences (P < 0.05) were found between flexion and extension in the diameter of the ventral and dorsal subarachnoid space and in the diameter of the cervical cord.
Compared with the results of previous studies using functional cervical myelograms, kinematic magnetic resonance imaging provides additional noninvasive data concerning the physiologic changes of the cervical subarachnoid space and the cervical cord during flexion and extension in healthy individuals.
在一个定位装置内对颈椎进行体内屈伸磁共振成像研究。
确定健康个体颈椎屈伸过程中颈髓和蛛网膜下腔的功能变化。
作为静态磁共振成像检查的补充，进行颈椎运动学磁共振成像研究以获取有关颈髓和蛛网膜下腔功能方面的详细信息。将结果与已发表的颈椎功能性屈伸脊髓造影数据进行比较。
使用定位装置，在全身磁共振扫描仪中对40名健康个体的颈椎从50度屈曲到30度伸展进行检查。在九个不同角度位置获取矢状面T1加权自旋回波序列。对图像进行节段运动、蛛网膜下腔直径和颈髓直径方面的分析。
C2 - C3节段屈伸之间的节段运动为11度，C3 - C4为12度，C4 - C5为15度，C5 - C6为19度，C6 - C7为20度。在屈曲时，观察到腹侧蛛网膜下腔狭窄达43%，背侧蛛网膜下腔增宽达89%（与中立位0度相比）。在伸展时，观察到腹侧蛛网膜下腔直径增加达9%，而背侧蛛网膜下腔缩小至17%。与中立位（0度；这些值因颈椎节段而异）相比，在屈曲时颈髓矢状径缩小达14%，在伸展时增加达15%。在腹侧和背侧蛛网膜下腔直径以及颈髓直径方面，屈曲和伸展之间存在统计学显著差异（P < 0.05）。
与先前使用功能性颈椎脊髓造影的研究结果相比，运动学磁共振成像提供了关于健康个体颈椎屈伸过程中蛛网膜下腔和颈髓生理变化的额外无创数据。
