This nerve runs near the surface of the skin on the side of the knee closest to the hand. The peroneal nerve controls the muscles that lift the foot. Disorders that affect the spinal cord or brain - such as stroke, multiple sclerosis or amyotrophic lateral sclerosis (ALS) - may cause foot drop. So can other neurologic disorders, such as polio or Charcot-Marie-Tooth disease. Various forms of muscular dystrophy, an inherited disease that causes progressive muscle weakness, can contribute to foot drop. People who have diabetes are more susceptible to nerve disorders, which are associated with foot drop. It can also be injured during hip or knee replacement surgery, which may cause foot drop.Ī nerve root injury - "pinched nerve" - in the spine also can cause foot drop. ![]() A serious knee injury can lead to the nerve being compressed. The most common cause of foot drop is compression of a nerve in the leg that controls the muscles involved in lifting the foot. ![]() ![]() Foot drop is caused by weakness or paralysis of the muscles involved in lifting the front part of the foot.
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