Hurmuzlu Y, Basdogan C, Stoianovici D
Mechanical Engineering Department, Southern Methodist University, Dallas, TX 75275, USA.
J Biomech Eng. 1996 Aug;118(3):405-11. doi: 10.1115/1.2796024.
The study reported in this article was conducted to propose a set graphical and analytical tools and assess their clinical utility by analyzing gait kinematics and dynamics of polio survivors. Phase-plane portraits and first return maps were used as graphical tools to detect abnormal patterns in the sagittal kinematics of post-polio gait. Two new scalar measures were introduced to assess the bilateral kinematic symmetry and dynamic stability of human locomotion. Nine healthy subjects and seventeen post-polio patients were involved in the project. Significant increases in the knee extension and ankle plantar flexion of post-polio patients were observed during the weight acceptance phases of their gait. Polio patients also exhibited highly noticeable excessive hip flexion during the swing phase of their ambulation. Using the proposed symmetry measure, we concluded that post-polio patients walked less symmetrically than normals. Our conclusion, however, was based on the bilateral symmetry in the sagittal plane only. Finally, we observed that post-polio patients walked significantly less stably than normals. In addition, weaknesses in lower extremity muscles of polio patients were found to be an important factor that affected stable ambulation.
本文所报道的研究旨在提出一套图形和分析工具，并通过分析小儿麻痹症幸存者的步态运动学和动力学来评估其临床效用。相平面画像和首次返回映射被用作图形工具，以检测小儿麻痹症后步态矢状面运动学中的异常模式。引入了两种新的标量测量方法，以评估人体运动的双侧运动学对称性和动态稳定性。该项目纳入了9名健康受试者和17名小儿麻痹症患者。观察到小儿麻痹症患者在步态的负重接受阶段，膝关节伸展和踝关节跖屈显著增加。小儿麻痹症患者在行走的摆动阶段还表现出非常明显的过度髋部屈曲。使用所提出的对称性测量方法，我们得出结论，小儿麻痹症患者行走时的对称性低于正常人。然而，我们的结论仅基于矢状面的双侧对称性。最后，我们观察到小儿麻痹症患者行走时的稳定性明显低于正常人。此外，发现小儿麻痹症患者下肢肌肉无力是影响稳定行走的一个重要因素。
