Abduction-adduction moments at the knee during stair ascent and descent.
Abduction-adduction moments at the knee during stair ascent and descent.
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DOI：
10.1016/0021-9290(95)00038-0
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发表时间：
1996-03
影响因子：
2.4
通讯作者：
David L. Kowalk;Jeffrey A. Duncan;Christopher L. Vaughan
中科院分区：
文献类型：
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作者：
David L. Kowalk;Jeffrey A. Duncan;Christopher L. Vaughan
为了研究爬楼梯时膝关节外展-内收力矩的相对大小，研究了10名正常受试者（平均体重660 N，腿长0.962 m，身高1.74 m）在重复的上楼梯和下楼梯试验中的情况。数据收集使用四个摄像头的视频系统和两个力板纳入飞行的三个楼梯。使用逆动力学方法计算膝关节的内部力矩，并将这些力矩的大小（体重百分比和腿长）和时间（站立百分比）标准化。主要结果为：（1）在上楼梯和下楼梯过程中，第一步和第二步的膝关节力矩在形状和大小上相似;（2）外展膝关节力矩，尽管大小相似（25-45 Nm），在统计学上小于伸展力矩（60-85 Nm）用于楼梯升降;（3）在整个站姿过程中，力矩模式均为外展肌型，表明地面反力向量始终通过膝关节中心内侧。虽然膝关节外展-内收力矩不在主要运动平面内，但在试图了解爬楼梯过程中膝关节的稳定性和功能时，不应忽略其大小。
To examine the relative magnitude of the knee abduction-adduction moments during stair climbing, ten normal subjects (average weight 660 N, leg length 0.962 m, height 1.74 m) were studied during repeated trials of stair ascent and descent. Data were collected using a four-camera video system and two forces plates incorporated within a flight of three stairs. The inverse dynamics approach was used to calculate internal moments at the knee, and these moments were normalized in magnitude (to percent body weight and leg length) and time (percent stance). The primary findings were: (1) knee joint moments were similar in shape and magnitude for the first and second steps during both stair ascent and descent; (2) the abduction knee moments, although comparable in magnitude (25–45 Nm), were statistically smaller than the extension moments (60–85 Nm) for stair ascent and descent; and (3) the moment patterns were exclusively abductor throughout stance, indicating that the ground reaction vector always passed medial to the knee joint center. Although the knee abduction-adduction moment is not in the primary plane of motion, its magnitude should not be ignored when trying to understand the stability and function of the knee during stair climbing.