drop foot caused by sciatic nerve

Drop Foot (Foot Drop) and Steppage Gait (Footdrop Gait)

Written by Stewart G. Eidelson, MD and Susan Spinasanta

Drop foot and foot drop are interchangeable terms that describe an abnormal neuromuscular (nerve and muscle) disorder that affects the patient's ability to raise their foot at the ankle. Drop foot is further characterized by an inability to point the toes toward the body (dorsiflexion) or move the foot at the ankle inward or outward. Pain, weakness, and numbness may accompany loss of function.
Walking becomes a challenge due to the patient's inability to control the foot at the ankle. The foot may appear floppy and the patient may drag the foot and toes while walking. Patients with foot drop usually exhibit an exaggerated or high-stepping walk called steppage gait or footdrop gait.
Drop Foot/Foot Drop: A Symptom
Drop foot is not a disease but a symptom of an underlying problem. Depending on the cause, drop foot may be temporary or permanent. Often drop foot is caused by injury to the peroneal nerve deep within the lumbar and sacral spine. The peroneal nerve is a division of the sciatic nerve. The peroneal nerve runs along the outside of the lower leg (below the knee) and branches off into each ankle, foot, and first two toes. It innervates or transmits signals to muscle groups responsible for ankle, foot, and toe movement and sensation.