The tibial nerve innervates the soleus and gastrocnemius muscles, which plantar flex
the foot, generate propulsive power for walking, provide a mechanism for the rocker actions of the foot and ankle, and retard uncontrolled tibial advancement.
Because of his inability to plantar flex
and invoke push off, the subject employed a heel-walking compensation strategy.
Nondisabled individuals actively plantar flex
at the end of stance phase, which is believed to provide push-off and generate significant power for forward progression.