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首页> 外文期刊>Journal of Biomechanics >Mechanical properties vary for different regions of the finger extensor apparatus
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Mechanical properties vary for different regions of the finger extensor apparatus

机译：机械性能因手指伸肌设备的不同区域而异

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摘要

The extensor apparatus, an aponeurosis that covers the dorsal side of each finger, transmits force from a number of musculotendons to the phalanges. Multiple tendons integrate directly into the structure at different sites and the extensor apparatus attaches to the phalanges at multiple points. Thus, prediction of the force distribution within the extensor apparatus, or hood, and the transmission to the phalanges is challenging, especially as knowledge of the underlying mechanical properties of the tissue is limited. We undertook quantification of some of these properties through material testing of cadaver specimens. We punched samples at specified locations from 19 extensor hood specimens. Material testing was performed to failure for each sample with a custom material testing device. Testing revealed significant differences in ultimate load, ultimate strain, thickness, and tangent modulus along the length of the extensor hood. Specifically, thickness, ultimate load, and ultimate strain were greater in the more proximal sections of the extensor hood, while the tangent modulus was greater in the more distal sections. The variations in mechanical properties within the hood may impact prediction of force transmission and, thus, should be considered when modeling the action of the extensor apparatus. Across the extensor hood, tangent modulus values were substantially smaller than values reported for other soft tissues, such as the Achilles tendon and knee ligaments, while ultimate strains were much greater. Thus, the tissue in the extensor apparatus seems to have greater elasticity, which should be modeled accordingly.
机译：伸肌装置是一种覆盖每个手指背侧的腱膜，它​​可以将力量从许多肌腱延伸到指骨。多个腱直接整合到不同位置的结构中，并且伸肌设备在多个点处附着在指骨上。因此，尤其是由于对组织的潜在机械特性的了解有限时，预测伸张器装置或引擎罩内的力分布以及向趾骨的传递的预测是具有挑战性的。我们通过尸体标本的材料测试对其中一些特性进行了量化。我们在19个伸臂发动机罩标本的指定位置打孔了样品。使用定制的材料测试设备对每个样品进行了材料测试，直至失败。测试表明，沿着伸展罩的长度，极限载荷，极限应变，厚度和切线模量存在显着差异。具体而言，在伸伸肌的近端部分，厚度，极限载荷和极限应变更大，而在远端部分中，切线模量更大。机罩内机械性能的变化可能会影响力传递的预测，因此，在对伸肌设备的动作进行建模时应予以考虑。在整个伸肌引擎盖上，切线模量值明显小于其他软组织（如跟腱和膝关节韧带）报告的值，而最终应变却大得多。因此，伸肌设备中的组织似乎具有更大的弹性，应该对此进行建模。

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