Schwartz Michael, Lakin Gaio
Gillette Children's Specialty Healthcare, 200 East University Avenue, St. Paul, MN 55101, USA.
Gait Posture. 2003 Apr;17(2):113-8. doi: 10.1016/s0966-6362(02)00058-9.
An induced acceleration analysis (IAA) model was used to investigate the effect of tibial torsion on the ability of the soleus to support and propel the body during gait. The IAA approach is well suited for this study because it allows soleus action to be quantified in the presence of varying amounts of tibial torsion, while other factors such as body configuration and muscle activation are held constant. The results of the analysis showed that excess tibial torsion shifts the induced knee joint accelerations toward flexion, valgus and external rotation, and diminishes body center-of-mass support and propulsion. This analysis supports the concept that bony mal-alignment can lead to 'lever arm dysfunction'. The objective data correlate with previous clinical observations related to valgus stress, crouch and the role of the soleus in level walking. The IAA model provides a tool for examining various aspects of abnormal gait independently and quantitatively.
采用诱导加速度分析（IAA）模型来研究胫骨扭转对比目鱼肌在步态中支撑和推动身体能力的影响。IAA方法非常适合这项研究，因为它能够在存在不同程度胫骨扭转的情况下量化比目鱼肌的作用，同时保持身体构型和肌肉激活等其他因素不变。分析结果表明，过度的胫骨扭转会使诱导的膝关节加速度向屈曲、外翻和外旋方向偏移，并减少身体重心的支撑和推进。该分析支持了骨排列不齐会导致“杠杆臂功能障碍”这一概念。客观数据与先前关于外翻应力、蹲伏以及比目鱼肌在平地行走中的作用的临床观察结果相关。IAA模型为独立且定量地检查异常步态的各个方面提供了一种工具。
