Kinematics and Dynamic Stability of the Locomotion of Post-Polio Patients

[+] Author and Article Information
Yildirim Hurmuzlu, Cagatay Basdogan, Dan Stoianovici

Mechanical Engineering Department, Southern Methodist University, Dallas, TX 75275

J Biomech Eng 118(3), 405-411 (Aug 01, 1996) (7 pages) doi:10.1115/1.2796024 History: Received September 12, 1994; Revised May 11, 1995; Online October 30, 2007


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.

Copyright © 1996 by The American Society of Mechanical Engineers
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