Effects of severe hallux valgus on metatarsal stress and the metatarsophalangeal loading during balanced standing: A finite element analysis
Effects of severe hallux valgus on metatarsal stress and the metatarsophalangeal loading during balanced standing: A finite element analysis
复制标题
严重拇外翻对平衡站立时跖骨应力和跖趾负荷的影响：有限元分析
DOI：
10.1016/j.compbiomed.2018.04.010
复制
发表时间：
2018-04
影响因子：
7.7
通讯作者：
Gu Yaodong
中科院分区：
文献类型：
--
作者：
Zhang Yan;Awrejcewicz Jan;Szymanowska Olga;Shen Siqin;Zhao Xiaoxue;Baker Julien S;Gu Yaodong
人类足部的内部应力可以有效地对与足部畸形相关的结构和功能损害进行参数评估，例如拇指外翻(HV)。然而，由于实验方法的困难和局限性，这种畸形足的内应力状况仍然没有得到充分的解决。本研究采用有限元方法，研究了平衡站立时，严重高压畸形对跖骨应力和跖趾关节载荷的影响。建立并验证了正常足和重型HV的有限元模型。每个有限元模型包括28块骨和各种软骨结构、韧带和足底筋膜，以及被包裹的软组织。除包膜软组织外，其余材料均为各向同性线弹性材料，包膜软组织为非线性超弹性材料。六面体单元被分配到骨骼、软骨和被包裹的软组织的实体部分。连接元素被分配给韧带和足底筋膜。创建了一个用于模拟地面支撑的板。在板的底部施加一半重量的垂直力，以模拟平衡站立荷载。包膜软组织、胫骨远端和腓骨远端的上表面被固定。对比分析了跖骨的应力分布、MTP关节处的接触压力和受力。与正常足相比，高压足显示出较高的应力集中，而较低的MTP关节载荷。此外，在第一个MTP关节处接触压力高的区域在HV足部向内侧移动。这项研究的知识表明，严重的HV畸形患者在负重时发生跖骨损伤和MTP关节功能损害的风险更高。
The internal stress of the human foot enables efficient parametric evaluation of structural and functional impairments associated with foot deformities, such as hallux valgus (HV). However, the status of the internal stress of such a deformed foot remains insufficiently addressed due to the difficulties and limitations of experimental approaches. This study, using finite element (FE) methodology, investigated the influence of severe HV deformity on the metatarsal stress and the metatarsophalangeal (MTP) joint loading during balanced standing. FE models of a normal foot and a severe HV were constructed and validated. Each FE model involves 28 bones and various cartilaginous structures, ligaments, and plantar fascia, as well as encapsulated soft tissue. All the materials except for the encapsulated soft tissue were considered isotropic and linearly elastic, while the encapsulated soft tissue was set as nonlinear hyperelastic. Hexahedral elements were assigned to the solid parts of bones, cartilage, and the encapsulated soft tissue. Link elements were assigned to ligaments and plantar fascia. A plate was created for simulating ground support. A vertical force of a half-body weight was applied on the bottom of the plate for simulating balanced standing loading. The superior surfaces of the encapsulated soft tissue, distal tibia, and distal fibula were fixed. Stress distribution in the metatarsals, contact pressure, and force at the MTP joints were comparatively analysed. Compared to the normal foot, the HV foot showed higher stress concentration in the metatarsals but lower magnitude of MTP joint loading. In addition, the region with high contact pressure at the first MTP joint shifted medially in the HV foot. Knowledge of this study indicates that patients with severe HV deformity are at higher risk of metatarsal injuries and functional impairment of the MTP joints while weight bearing.
登录
查看更多内容
DOI：
10.1016/0021-9290(81)90128-7
发表时间：
1981
期刊：
Bulletin of prosthetics research
影响因子：
--
作者：
S. Nakamura;R. Crowninshield;R. R. Cooper-R.
通讯作者：
S. Nakamura;R. Crowninshield;R. R. Cooper-R.
影响因子：
4.7
作者：
Hurn, Sheree E.;Vicenzino, Bill;Smith, Michelle D.
通讯作者：
Smith, Michelle D.
影响因子：
1.8
作者：
Yu, Jia;Cheung, Jason Tak-Man;Zhang, Ming
通讯作者：
Zhang, Ming
DOI：
10.1053/j.jfas.2006.10.011
发表时间：
2007-05-01
期刊：
The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons
影响因子：
--
作者：
Pique-Vidal, Carlos;Sole, Maria T;Antich, Jaume
通讯作者：
Antich, Jaume
影响因子：
--
作者：
D. Camacho;W. Ledoux;E. Rohr;B. Sangeorzan;R. Ching
通讯作者：
D. Camacho;W. Ledoux;E. Rohr;B. Sangeorzan;R. Ching