MODIFICATION OF SPASTIC GAIT THROUGH MECHANICAL DAMPING

Abstract A feasibility study investigating the use of dissipative mechanical damping loads to modify spastic gait is currently underway. The concept of a mechanically damped orthosis is based on a hypothesis citing velocity-dependent stretch reflexes as a causal factor in certain spastic gait abnormalities, such as equinus and backkneeing. Accordingly, the experimental subject was selected on the basis of a velocity-dependent reflex, as established through a series of seated “ankle stretch” experiments. To facilitate study of a variety of damping schemes and iteration towards optimal damping parameters, a wearable, electromechanical, computer-controlled ankle orthosis simulator was designed and constructed. The simulator is instrumented to measure important gait variables so that effects of the applied mechanical loads on the subject's gait patterns can be assessed. Initial orthosis simulation experiments have begun. The most effective damping schemes will be compared with rigid bracing through filmed gait analysis.