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首页> 外文期刊>Journal of Biomechanics >The effect of static muscle forces on the fracture strength of the intact distal radius in vitro in response to simulated forward fall impacts
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The effect of static muscle forces on the fracture strength of the intact distal radius in vitro in response to simulated forward fall impacts

机译：响应模拟的前倾冲击，静力对体外完整远端distal骨断裂强度的影响

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摘要

The distal radius fracture (DRF) is a particularly dominant injury of the wrist, commonly resulting from a forward fall on an outstretched hand. In an attempt to reduce the prevalence, costs, and potential long-term pain/deformities associated with this injury, in vivo and in vitro investigations have sought to classify the kinematics and kinetics of DRFs. In vivo forward fall work has identified a preparatory muscle contraction that occurs in the upper extremity prior to peak impact force. The present investigation constitutes the first attempt to systematically determine the effect of static muscle forces on the fracture threshold of the distal radius in vitro. Paired human cadaveric forearm specimens were divided into two groups, one that had no muscle forces applied (i.e., right arms) and the other that had muscle forces applied to ECU, ECRL, FCU and FCR (i.e., left arms), with magnitudes based on peak muscle forces and in vivo lower bound forward fall activation patterns. The specimens were secured in a custom-built pneumatic impact loading device and subjected to incremental impacts at pre-fracture (25. J) and fracture (150 J) levels. Similar fracture forces (6565 (866). N and 8665 (5133). N), impulses (47 (6). Ns and 57 (30). Ns), and energies (152 (38). J and 144 (45). J) were observed for both groups of specimens (p>0.05). Accordingly, it is suggested that, at the magnitudes presently simulated, muscle forces have little effect on the way the distal radius responds to forward fall initiated impact loading.
机译：radius骨远端骨折（DRF）是手腕的特别主要伤害，通常是由于向前伸直伸出一只手所致。为了降低与这种损伤相关的患病率，成本和潜在的长期疼痛/畸形，已经进行了体内和体外研究以对DRF的运动学和动力学进行分类。体内前倾工作已经确定了在峰值冲击力之前发生在上肢的预备性肌肉收缩。本研究是系统地确定静态肌肉力对体外vitro骨远端骨折阈值的影响的首次尝试。配对的人体尸体前臂标本分为两组，一组未施加肌肉力（即右臂），另一组未施加肌肉力至ECU，ECRL，FCU和FCR（即左臂），其幅度基于峰值肌肉力量和体内下限前倾激活模式。将样本固定在定制的气动冲击加载设备中，并在预断裂（25. J）和断裂（150 J）的水平上承受增量冲击。类似的断裂力（6565（866）。N和8665（5133）。N），脉冲（47（6）。Ns和57（30）。Ns）和能量（152（38）。J和144（45）两组标本均观察到（J））（p> 0.05）。因此，建议在当前模拟的幅度下，肌肉力对远端radius骨对前倾引发的冲击载荷的响应方式影响很小。

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