胸锁乳突肌三维有限元的建立

关键词：胸锁乳突肌  三维有限元  肌筋膜

Keywords:sternocleidomastoid muscle  three-dimensional finite element  muscular fasciae

摘要：

      目的：采用三维有限元重建技术，建立出胸锁乳突肌的三维有限元模型。研究和分析颈部体位姿势对本模型各组成部分应力变化和分布特点的影响。方法：取材来自中国数字人I号头颈部断面切片图片，层距0.2mm，图片序号7800-8400，包含数字人胸锁乳突肌全长。对图片序号每间隔10张抽取1张，层厚2mm(0.2mm×10)。图片保存为BMP灰度图。采用Ansys8.0软件，分别以双侧轴向向上载荷100N，作用于乳突部，模拟头后仰时拉伸力；给一侧乳突部水平向前拉力100N，另一侧乳突部水平向后拉力100N，模拟头旋转时作

Abstract:

      Objective:To set a three-dimensional finite element model of sternocleidomastoid muscle with Ansys8.0 soft system, in order to study the effect of postures of head and neck on stress changes and the distribution characteristics of the muscle. Method: The digital pictures of cross section of neck with a serial number from 7800 to 8400 and interval 0.2 mm were taken from the first of Digital Virtual Chinese Human I, which including total length of sternocleidomastoid muscle. Getting 1 piece of picture every interval 10pieces from the serial number to build model of the muscle according the acquired of 3D and the height of slide was 2mm(0.2mm×10). The manner of picture was keep for BMP.A pulling force of 100N was loaded axially and upward on one pair of sternocleidomastoid muscle at mastoid processes to simulate head extension. A force of 100N was loaded on mastoid level forward at one side and at the mean time, a force of 100N was loaded backward at another side to simulate head rotation. Result: The 3D finite element models were established with the digital pictures and Ansys 8.0, which including one side and both sides of sternocleidomastoid muscle. During simulating head extension, the stress loaded on the muscle was fair well-distributed and acting point concentrated on mastoid process areas of sternocleidomastoid muscles of both sides. During simulating head rotation, the stress distributed at high stress area and acting point concentrated on mastoid process area and middle-inferior belly of sternocleidomastoid muscle of contrast side. Conclusion: This three-dimensional finite element model was accurate, simulated, could be directly perceived through one′s view, and could meet the demanol of study. The further study is needed.