Article

The purpose of this study was to determine how gait deviation in one plane
(i.e. excessive subtalar inversion/eversion) can affect the dynamic function of the
tibialis anterior, gastrocnemius, and soleus to accelerate the subtalar, ankle,
knee and hip joints, as well as the body center of mass. Induced acceleration
analysis was performed based on a subject-specific three-dimensional linkage
model configured by stance phase gait data and driven by one unit of muscle
force. Eight healthy adult subjects were examined in gait analysis. The subtalar
inversion/eversion was modeled by offsetting up to 20 degrees from the normal
subtalar angle while other configurations remained unaltered. This study showed
that the gastrocnemius, soleus and tibialis anterior generally functioned as
their anatomical definition in normal gait, but counterintuitive function was
occasionally found in the bi-articular gastrocnemius.
The plantarflexors play
important roles in the body support and forward progression. Excessive subtalar
eversion was found to enlarge the plantarflexors and tibialis anterior's
function. Induced acceleration analysis demonstrated its ability to isolate the
contributions of individual muscle to a given factor, and as a means of studying
effect of pathological gait on the dynamic muscle functions.
CI - Copyright (c) 2011 Elsevier B.V. All rights reserved.

Langue : ANGLAIS