Secondary motions of the knee during weight bearing and non-weight bearing activities
Secondary motions of the knee during weight bearing and non-weight bearing activities
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DOI：
10.1016/j.orthres.2003.11.003
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发表时间：
2004-07-01
影响因子：
2.8
通讯作者：
Andriacchi, TP
中科院分区：
文献类型：
--
作者：
Dyrby, CO;Andriacchi, TP
本研究的目的是验证这样一种假设：在步行等负重活动中，膝关节二次运动(前后平移(AP)、内旋(IE)和外展内收(AB-内收))与膝关节屈曲角度之间存在动态范围(运动包络)。此外，还测试了负重和非负重活动之间运动包络的差异。通过测试步行周期和坐式腿部伸展(非负重)中特定膝关节屈曲角度的二次位移的差异(偏移量)来评估该假说。运动学测量是使用先前开发的点群技术来分析膝关节的六自由度运动而获得的。在步行过程中，IE旋转和AP平移与膝关节屈曲的相位图显示，在相同的屈曲角度下，步态周期的一个阶段到另一个阶段有显著的偏移。在非负重活动中，二次运动没有发现明显的偏移；膝关节在该活动的屈伸阶段遵循相同的运动轨迹。步行过程中二次运动的特点表明，膝关节二次运动是由行走周期不同阶段作用于膝关节的外力(肌肉、惯性和重力)引起的。包络的边界似乎反映了被动约束的特征。在步行活动中看到的负重二次运动AP和IE旋转显示了动态松弛的包络，这可能被用来评估膝关节的功能不稳定性。(C)2003年骨科研究会。爱思唯尔有限公司出版。保留所有权利。
The objective of this study was to test the hypothesis that during a weight bearing activity such as walking, a dynamic range (envelope of motion) exists in the relationship between the secondary knee motions (anterior-posterior (AP) translation, internal-external (IE) rotation, and abduction-adduction (Ab-Adduction)) and knee flexion angle. In addition differences in the envelope of motion between a weight bearing and non-weight bearing activity were tested. The hypothesis was evaluated by testing for differences (offsets) in secondary displacements at specific knee flexion angles during the walking cycle and seated leg extension (non-weight bearing). Kinematic measurements were obtained using a previously developed point cluster technique to analyze the six-degrees of freedom movement of the knee. During walking, phase plots of the IE rotation and AP translation versus knee flexion demonstrated significant offsets from one phase of the gait cycle to another at the same flexion angle. During the non-weight bearing activity, no significant offset in the secondary movement was found; the knee followed the same pathway of motion during the flexion and extension phase of this activity. The characteristics of the secondary motions during walking indicated that secondary knee movements are caused by the external forces (muscle, inertial and gravitational) that act on the knee during the various phases of the walking cycle. The boundaries of the envelope appear to reflect the characteristics of the passive restraints. The weight bearing secondary motion AP and IE rotation seen during a walking activity demonstrated an envelope of dynamic laxity that could potentially be used to evaluate functional instabilities at the knee. (C) 2003 Orthopaedic Research Society. Published by Elsevier Ltd. All rights reserved.