Nasal tip support: a finite element analysis of the role of the caudal septum during tip depression.
Nasal tip support: a finite element analysis of the role of the caudal septum during tip depression.
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DOI：
10.1002/lary.24321
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发表时间：
2014-03
期刊：
影响因子：
2.6
通讯作者：
Wong, Brian J. F.
中科院分区：
文献类型：
--
作者：
Manuel, Cyrus T.;Leary, Ryan;Protsenko, Dmitriy E.;Wong, Brian J. F.
虽然已经详细描述了次要和主要鼻尖支持机制，但没有定量模型能够客观地支持主要鼻翼软骨结构特性、纤维附着于周围结构和刚性支持结构的相对贡献。采用有限元方法计算鼻尖简单压缩过程中鼻部的应力分布，从而确定抵抗变形从而起到“鼻尖支撑”作用的具体解剖结构。此外，我们还研究了尾部鼻中隔切除术对鼻尖支撑的影响。计算机模型由三个组织组成，这些组织具有解剖学上正确的皮肤和骨骼几何形状，这些几何形状来自CT数据。采用三维CAD软件对鼻中隔、上外侧软骨和鼻翼主要软骨进行拟合。对尾间隔切除（3mm和5mm）和未切除的模型进行5mm鼻尖压缩模拟触诊，计算得到的应力和位移的空间分布。正常模型的von Mises应力主要沿内侧脚角方向集中。随着尾间隔长度的减少，应力被重新分配到邻近的软组织和骨骼，导致作用在间隔上的力减少。在所有模型中，中间脚附近的位移最大。这些模型是鼻尖动力学综合力学分析的第一步。我们的模型支持尾隔和主要鼻翼软骨的概念，提供了大部分关键的承重支持。N/A
Although minor and major tip support mechanisms have been described in detail, no quantitative models exist to provide support for the relative contributions of the structural properties of the major alar cartilage, the fibrous attachments to surrounding structures, and the rigid support structures in an objective manner. The finite element method was used to compute the stress distribution in the nose during simple tip compression, and then identify the specific anatomic structures that resist deformation and thus contribute to “tip support”. Additionally, the impact of caudal septal resection on nasal tip support was examined. The computer models consisted of three tissue components with anatomically correct geometries for skin and bone derived from CT data. Septum, upper lateral cartilages, and major alar cartilages were fitted within the model using 3D CAD software. 5mm nasal tip compression was performed on the models with caudal septal resection (3mm and 5 mm) and without resection to simulate palpation, then the resulting spatial distribution of stress and displacement was calculated. The von Mises stress in the normal model was primarily concentrated along medial crural angle. As caudal septum length was reduced, stress was redistributed to adjacent soft tissue and bone, resulting in less force acting on the septum. In all models, displacement was greatest near the intermediate crura. These models are the first step in the comprehensive mechanical analysis of nasal tip dynamics. Our model supports the concept of the caudal septum and major alar cartilage as providing the majority of critical load-bearing support. N/A
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