Below the knee muscle weakness, defined by weak
dorsiflexor (shin) or plantarflexor (calf) muscle groups, can result from a
variety of physical impairments or congenital abnormalities. Stroke, spinal
cord injuries, polio and multiple sclerosis are among some of the physical injuries
and congenital defects responsible for the condition. The largest complication
from below the knee muscle weakness is abnormal gait, which when compensated
for can lead to further complications in other muscles and joints.