Morales-Orcajo Enrique, Becerro de Bengoa Vallejo Ricardo, Losa Iglesias Marta, Bayod Javier
Group of Structural Mechanics and Materials Modeling (GEMM), Aragón Institute of Engineering Research (I3A), University of Zaragoza, Zaragoza, Spain; Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain; Group of Biomechanical Engineering UFMG - (MecBio), School of Engineering, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.
Nursing Physiotherapy and Podiatry Faculty, Medicine Faculty, Complutense University, Madrid, Spain.
Clin Biomech (Bristol). 2016 Aug;37:1-6. doi: 10.1016/j.clinbiomech.2016.05.014. Epub 2016 May 27.
The aim of this study was to assess the mechanical properties of the main balance tendons of the human foot in vitro reporting mechanical structural properties and mechanical material properties separately. Tendon structural properties are relevant for clinical applications, for example in orthopedic surgery to elect suitable replacements. Tendon material properties are important for engineering applications such as the development of refined constitutive models for computational simulation or in the design of synthetic materials.
One hundred uniaxial tensile tests were performed to obtain the mechanical response of the main intrinsic and extrinsic human foot tendons. The specimens were harvested from five frozen cadaver feet including: Extensor and Flexor tendons of all toes, Tibialis Anterior and Posterior tendons and Peroneus Brevis and Longus tendons.
Cross-sectional area, load and strain failure, Young's modulus and ultimate tensile stress are reported as a reference of foot tendon mechanical properties. Two different behaviors could be differentiated. Tibialis and Peroneus tendons exhibited higher values of strain failure compared to Flexor and Extensor tendons which had higher Young's modulus and ultimate tensile stress. Stress-strain tendon curves exhibited proportionality between regions. The initial strain, the toe region and the yield point corresponded to the 15, 30 and 70% of the strain failure respectively.
Mechanical properties of the lesser-studied human foot tendons are presented under the same test protocol for different engineering and clinical applications. The tendons that work at the inversion/eversion plane are more deformable at the same stress and strain rate than those that work at the flexion/extension plane.
本研究的目的是在体外评估人足部主要平衡肌腱的力学性能，分别报告其力学结构性能和力学材料性能。肌腱结构性能与临床应用相关，例如在整形外科手术中选择合适的替代物。肌腱材料性能对于工程应用很重要，如开发用于计算模拟的精细本构模型或合成材料的设计。
进行了100次单轴拉伸试验，以获得人足部主要内在和外在肌腱的力学响应。标本取自5只冷冻尸体足部，包括：所有脚趾的伸肌腱和屈肌腱、胫前肌腱和胫后肌腱以及腓骨短肌和腓骨长肌肌腱。
报告了横截面积、载荷和应变失效、杨氏模量和极限拉伸应力，作为足部肌腱力学性能的参考。可以区分出两种不同的行为。与屈肌腱和伸肌腱相比，胫肌腱和腓骨肌腱表现出更高的应变失效值，屈肌腱和伸肌腱具有更高的杨氏模量和极限拉伸应力。应力-应变肌腱曲线在各区域之间呈现出比例关系。初始应变、趾部区域和屈服点分别对应于应变失效的15%、30%和70%。
在相同的试验方案下，针对不同的工程和临床应用，展示了研究较少的人足部肌腱的力学性能。在相同应力和应变率下，在内翻/外翻平面起作用的肌腱比在屈伸平面起作用的肌腱更易变形。
