Goel V K, Yamanishi T M, Chang H
Department of Biomedical Engineering, University of Iowa, Iowa City 52242.
Ann Biomed Eng. 1992;20(6):667-86. doi: 10.1007/BF02368612.
A fresh ligamentous occipito-atlanto-axial (C0-C1-C2) complex was appropriately prepared and serially sectioned into thin slices along the transverse planes. The bony outlines from these slices were digitized and assembled in the proper manner to obtain a three-dimensional model of the complex using the AutoCAD system. Various ligaments were identified on the model and strains in individual fibers of a ligament were predicted based on the principles of rigid body mechanics. The ligament behaviors in axial rotation, flexion, and extension modes were analyzed. The capsular ligament fibers were predicted to undergo strains in all modes. Furthermore, these ligaments experienced the largest strain among the ligaments analyzed. Fibers within a ligament were found to respond differently; some were more active than the others and some did not experience any strain at all. A differential behavior in the right and left side alar ligament fibers was also found in axial rotation. The transverse ligament was predicted to wrap around the dens during axial rotation. The strain within a fiber was found to be a function of the initial length (ligament laxity) and its distance from the center of rotation.
制备新鲜的枕-寰-枢（C0-C1-C2）韧带复合体，并沿横断面连续切成薄片。将这些切片的骨轮廓数字化，并以适当方式组装，使用AutoCAD系统获得该复合体的三维模型。在模型上识别出各种韧带，并根据刚体力学原理预测韧带中单个纤维的应变。分析了韧带在轴向旋转、屈曲和伸展模式下的行为。预计关节囊韧带纤维在所有模式下都会发生应变。此外，在分析的韧带中，这些韧带经历的应变最大。发现韧带内的纤维反应不同；一些比其他纤维更活跃，一些根本没有经历任何应变。在轴向旋转时，还发现左右侧翼状韧带纤维存在差异行为。预计横韧带在轴向旋转时会围绕齿突缠绕。发现纤维内的应变是初始长度（韧带松弛度）及其与旋转中心距离的函数。
