在跑步过程中估计关节力矩时跖趾关节中心位置的比较。

A comparison of metatarsophalangeal joint center locations on estimated joint moments during running.

机构信息

Department of Human Physiology, University of Oregon, Eugene, OR, USA.

出版信息

J Biomech. 2019 Mar 27;86:64-70. doi: 10.1016/j.jbiomech.2019.01.044. Epub 2019 Jan 30.

DOI:10.1016/j.jbiomech.2019.01.044

Abstract

The forefoot functions as the base of support during late stance, rotating about the dual-axis of the metatarsophalangeal joints. Previous research has shown that joint axis definition affects estimated joint moments about the forefoot. However, little is known about how metatarsophalangeal joint center definition affects estimated joint kinetics. This study compared moments about the metatarsophalangeal joint using four different defined joint centers. There was a significant difference (p < .001) in peak moments between joint center definitions, differing by up to 0.488 N-m/kg for the slow and 0.878 N-m/kg for the fast running speeds tested. Additionally, there was a significant difference (p < .001) for when peak plantar flexor moment occurred during the slower running condition. The more posteriorly oriented joint centers resulted in higher moments and earlier onset of the plantar flexor moment. In addition to careful modeling of the metatarsophalangeal joint axis, it is recommended that joint center definition should be considered as well.

摘要

前足在末期支撑时作为支撑的基础，围绕跖趾关节的双轴旋转。先前的研究表明，关节轴的定义会影响前足的关节力矩估计。然而，对于跖趾关节中心定义如何影响估计的关节动力学，人们知之甚少。本研究使用四个不同定义的关节中心比较了跖趾关节的力矩。在峰值时刻，关节中心定义之间存在显著差异（p<0.001），在较慢的跑步速度下，差异最大可达 0.488 N-m/kg，在较快的跑步速度下可达 0.878 N-m/kg。此外，在较慢的跑步条件下，跖屈肌峰值时刻的出现也存在显著差异（p<0.001）。更靠后的关节中心导致更高的力矩和更早的跖屈肌力矩起始。除了仔细模拟跖趾关节轴之外，还建议考虑关节中心的定义。