Ankle muscle performance is
affected in 10-20% of those who have had a strok and ankle muscle performance impairment is a
common residual from trauma, multiple sclerosis and neurological injury and
illness.
Loss of ankle muscle performance
results in an inefficient walking pattern and increases the risk of falling. Loss
of ankle dorsiflexor muscle performance results in a foot drop during the
swing phase of walking and at initial contact with the ground, increasing the
risk of falls as a consequence of a functionally longer leg.
Loss of ankle plantarflexor
muscle performance results in poorly controlled tibial progression over the
planted foot during stance and lack of push off (ankle power) at the end of
stance. Overall, in those with impaired ankle function, walking speed is
slower, step length is decreased, and ability to perform dynamic activities
often required in daily life is limited (e.g. fast walking or jogging to cross
the street safely, walking on uneven surfaces and up hills).
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