Foot drop — the inability to raise the front part of the foot — causes a characteristic high-stepping gait and is a sign of nerve or brain disease. Dr. Anand Karnam explains the common causes from peroneal nerve palsy to stroke.
Key Points
- Foot drop is inability to lift the front of the foot — caused by weakness of the ankle dorsiflexors.
- Most common cause: common peroneal nerve palsy at the fibular neck (from leg crossing, prolonged squatting).
- Other causes: L4-L5 disc herniation, stroke affecting the motor cortex, and motor neurone disease.
- Ankle-foot orthosis (AFO) allows safe walking while nerve recovery is awaited.
- Recovery from peroneal nerve injury usually occurs in 3–12 months — physiotherapy maintains joint mobility during this time.
3–12 months
typical recovery time for peroneal nerve foot drop
Source: NCBI
80%
of peroneal nerve palsy cases recover without surgical intervention
Source: Cochrane
6–12 wks
onset delay from L5 disc herniation to foot drop in most cases
Source: NCBI
"Foot drop from crossing legs too long or squatting at a toilet — peroneal nerve palsy — is almost always self-limited and recovers in weeks to months. But foot drop from an L5 disc prolapse needs imaging to guide treatment. The cause determines everything."
Foot drop is the inability to dorsiflex (lift) the foot at the ankle — the affected person cannot raise the toes or front of the foot while walking, causing the foot to drag along the ground. To clear the foot during walking, the patient compensates by lifting the knee higher than normal (steppage gait) or by swinging the leg outward (circumduction gait). Foot drop is a symptom — not a diagnosis — and can result from pathology at multiple levels of the nervous system.
Causes by Level
Common peroneal nerve palsy (most common peripheral cause): The common peroneal nerve wraps around the head of the fibula at the knee — extremely vulnerable to compression from habitually crossing the legs, prolonged squatting (agricultural workers, craftsmen), plaster cast pressure, or weight loss (loss of the protective fat pad). Causes foot drop + numbness over the lateral leg and dorsum of foot. Usually recoverable with nerve regeneration if the cause is removed.
Lumbar disc herniation (L4-L5): A large disc herniation at L4-L5 compresses the L5 nerve root — causing foot drop with pain radiating from the back down the lateral leg to the big toe. This is radiculopathy-caused foot drop — associated with back pain and a positive straight leg raise test. Spontaneous recovery in 85% with conservative management; surgical decompression if not improving after 6 weeks.
Stroke or brain tumour: A cortical or subcortical lesion affecting the motor cortex or corticospinal tract produces upper motor neuron foot drop — spastic, with brisk reflexes, a Babinski sign, and often accompanied by arm weakness and hemispatial neglect.
Peripheral neuropathy: Severe diabetic or hereditary neuropathy can cause bilateral foot drop with a symmetrical presentation.
Treatment
Ankle-foot orthosis (AFO) — a plastic brace that holds the foot in neutral position during walking — improves gait safety immediately while the nerve recovers. Physiotherapy: strengthening of ankle dorsiflexors; gait retraining. FES (functional electrical stimulation): a device that electrically stimulates the peroneal nerve during walking — an alternative to AFO. Surgical decompression if nerve compression from disc is the cause. Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.
Dr. Anand Karnam
DrNB Neurology · Sri Anand CNC, Chanda Nagar Hyderabad · Sri Anand Child and Neuro Center
DrNB-qualified Neurologist, Fellow of the World Headache Society (FWHS), and Headache Specialist with 12+ years of experience treating epilepsy, stroke, migraine, and movement disorders. Practices at Sri Anand Child and Neuro Center, Chanda Nagar, Hyderabad.
References & Sources
- 1.Foot Drop — NCBI StatPearls — NCBI StatPearls
- 2.Foot Drop — NHS — NHS UK
- 3.Peripheral Nerve Disorders — NIH MedlinePlus — NIH MedlinePlus
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