Foot Drop: Causes, Symptoms, Exercises, and Physiotherapy

Written by Dr Ajay Shakya, BPT, MPT (Neurological Conditions) | Published: August 2026. All clinical content is cross-referenced against peer-reviewed literature and current physiotherapy practice. See References below.

Quick Summary

Foot drop is the inability to raise the front part of the foot, typically due to weakness or injury to the nerves that control the ankle's dorsiflexor muscles. It may be the result of nerve compression, spinal disorders, diabetes, a stroke, or trauma. In most cases, a combination of physiotherapy, braces, and treatment of the underlying cause is effective—although recovery time varies widely depending on the cause.

1. What is foot drop?

Foot drop is the condition in which a person is unable to lift the front section of the foot upwards—a movement known as dorsiflexion—because of weakness or paralysis of the muscles that are responsible for this action. It is not a disease in itself but rather a symptom of an underlying neurological, muscular, or spinal issue. People with foot drop often find their toes catch on the ground while walking, so they compensate by lifting their knee abnormally high, a gait pattern called a "steppage gait."

Foot drop may affect one foot (unilateral) or, more infrequently, both feet (bilateral), depending on whether the original cause acts on a single nerve pathway or on a wider system such as the spinal cord or the peripheral nerves throughout the body.

2. The causes of foot drop

Foot drop is most often caused by compression of the peroneal nerve at the fibular head, just below the knee, since the nerve is situated close to the surface of the bone and is therefore susceptible to pressure, injury, or long-term compression. Common causes include prolonged sitting cross-legged, wearing tight leg casts or braces, frequently crossing your legs, significant weight loss, or a blow to the outer side of the knee.

Another major cause involves the lumbar spine. The condition known as L5 radiculopathy — which involves a compressed nerve root in the lower back — is the most common spinal cause of foot drop. It is generally due to a herniated disc, spinal stenosis, or degenerative changes in the lumbar spine. Foot drop has been recorded in as many as 7.7% of patients with lumbar degenerative disease.

Other important causes include:

• Trauma or surgical complications — hip, knee, or spine surgeries can occasionally injure the peroneal nerve
• Because of diabetes, chronically high blood sugar levels can damage peripheral nerves, including those that control the foot.
• Stroke or brain injury — damage to the brain's motor centers can reduce control of foot movement, producing a centrally-driven form of foot drop
• Multiple sclerosis and ALS — progressive neurological conditions that affect nerve signaling or motor neurons directly
• Muscular dystrophy — an inherited condition that progressively weakens muscles, including the dorsiflexors

3. Nerve Involved in Foot Drop

The nerve most frequently implicated in foot drop is the common peroneal nerve (also known as the fibular nerve), a branch of the sciatic nerve. It separates from the sciatic nerve above the knee, loops around the head of the fibula just below the knee joint, and then divides into deep and superficial branches that are responsible for dorsiflexion and eversion of the foot. At the fibular neck, the nerve lies superficially, making it the most common site of compression causing foot drop.

If the problem is due to the spine rather than the leg, the L4, L5, or S1 nerve roots are usually affected, since these roots eventually supply fibers to the peroneal nerve pathway that controls the tibialis anterior and the other dorsiflexor muscles.

Clinical tip: When testing hip abduction, you can help determine the cause—if there is weakness in this movement, it suggests lumbar radiculopathy rather than a sole peroneal nerve injury at the knee, since the peroneal nerve does not innervate the gluteal muscles.

4. The symptoms of foot drop

The main symptom is difficulty or inability to lift the front part of the foot, causing the toes to drag or catch on the ground while walking. As a result, most people develop a high-stepping gait, raising their knees higher than usual to clear their feet from the ground.

Other symptoms may include numbness or tingling on the top of the foot and the outer part of the shin, a snapping sound when the foot strikes the ground while walking (known as a foot slap), and mild-to-moderate ankle instability. In some cases, people also experience weakness when trying to turn the foot outward (eversion), especially if the cause is a peroneal nerve problem rather than a spinal issue.

5. Diagnosis

Diagnosis starts with a clinical history and physical examination, during which the clinician evaluates ankle and toe strength, reflexes, gait pattern, and any sensory changes. To determine whether the source of the problem is the spine, the sciatic nerve, or the peroneal nerve itself, the clinician usually examines hip and other leg muscle strength not supplied by the peroneal nerve.

Electromyography (EMG) and nerve conduction studies (NCS) are the gold standard for confirming the site and severity of nerve involvement. When a structural cause such as a herniated disc, a tumor, or a ganglion cyst is suspected, imaging investigations like an MRI of the lumbar spine or knee may be employed.

Physiotherapy Assessment for Foot Drop: The Foot Drop Test

The foot drop test is a simple bedside assessment to determine whether a person has weakness in lifting the front of the foot. It is usually performed in several simple steps:

1. Check for active dorsiflexion — When the person is seated or lying down (without putting any weight on the foot), they attempt to lift their foot towards their shin. The inability to do this actively is the main positive sign of foot drop.
2. The passive range-of-motion check involves the examiner passively dorsiflexing the ankle; this excludes the possibility of ankle joint stiffness or contracture, thereby confirming that the issue is muscular or neurological rather than mechanical.
3. Heel walk test — A person is asked to walk 10 to 15 feet on their heels; someone with foot drop will either be unable to keep the affected foot raised throughout or be unable to raise it at all.
4. For the manual muscle test (MMT), the examiner manually resists dorsiflexion and assesses strength on a standard 0–5 scale, ranging from no contraction to full strength.
5. To test for Tinel's sign at the fibular head, gently tap over the peroneal nerve just below the knee; if the foot becomes tingling, it means that the nerve is irritated at that location.

These tests collectively confirm foot drop, assess its severity, and provide an early indication of whether the cause is at the peroneal nerve near the knee or higher, for example, at the lumbar spine.

6. Management and Treatment

General Treatment

Treatment for foot drop depends heavily on the underlying cause; if it is due to a treatable structural problem—for instance, a herniated disc pressing on a nerve root—treating that problem, which may involve surgery, can lead to significant recovery.

Conservative treatment—this involves changes to activity, getting rid of the cause of the compression, and keeping an eye on the recovery of the nerve—is often enough for nerve compression injuries that do not need surgery. In some cases of long-standing nerve injury that has not improved with conservative treatment, nerve transfer surgery may be considered.

AFO Brace for Foot Drop

An ankle-foot orthosis (AFO) is a brace worn on the lower leg and foot to keep the ankle in a neutral position and prevent the toes from dragging or catching the ground when walking; it is one of the most frequently used non-surgical methods for treating foot drop.

How it helps: The brace holds the foot at roughly a 90-degree angle to the shin, effectively substituting for the weak or paralyzed dorsiflexor muscles during walking. This reduces the risk of tripping and falling and often produces an immediate, noticeable improvement in gait.

Types:

• Posterior leaf spring AFO — a flexible design that allows some natural plantarflexion at heel strike and push-off, suited to milder or flaccid weakness.
• Rigid/anterior AFO — provides firmer immobilization, generally used when ankle instability or spasticity is a concern, such as after a stroke.
• Shoe-clasp orthosis — a lighter option that attaches directly to the shoe's heel counter.

Research comparing designs has found that anterior AFOs are associated with lower walking energy costs and higher comfort than posterior designs in some patients. However, the right choice depends on the individual's specific pattern of weaknesses and goals.

Important note: An AFO manages the symptom, not the underlying cause. Pair it with physiotherapy—strengthening, stretching, and gait training—rather than using it alone, since consistent muscle use alongside bracing supports better long-term recovery.

Physiotherapy Treatment

Physiotherapy plays a central role in managing foot drop, regardless of the underlying cause. A standard program includes patient education, stretching to prevent ankle stiffness and contractures, range-of-motion exercises, gradual strengthening of the dorsiflexor muscles, gait training, and, where appropriate, electrical stimulation or sensorimotor retraining.

Functional electrical stimulation is increasingly used in physiotherapy; during the swing phase of walking, it delivers electrical pulses to the dorsiflexor muscles to help with active foot clearance.

Important point: Start physiotherapy early. If rehabilitation is delayed, secondary problems such as joint contractures and further muscle weakness can occur, slowing recovery even after the original nerve problem has begun to heal.

7. Foot Drop Exercises

Ankle Pumps (Dorsiflexion/Plantarflexion)	Maintains ankle mobility, prevents stiffness	3 sets of 15
Towel-Assisted Dorsiflexion Stretch	Prevents Achilles tightness and contracture	3 holds of 20–30 sec
Resisted Dorsiflexion (Band)	Strengthens the tibialis anterior	3 sets of 10–12
Marble/Towel Pickups with Toes	Improves fine motor control of foot muscles	2–3 sets of 10
Heel Walks	Functional strengthening of dorsiflexors	2–3 sets of 10–15 steps
Seated Foot Tapping	Builds neuromuscular activation and endurance	3 sets of 20 taps

They are usually introduced gradually and adjusted based on the severity of weakness and the specific diagnosis. A 12-week individualized physiotherapy program involving lower-limb stretching, strengthening, and weight-bearing exercises can significantly improve strength, balance, and gait scores in patients recovering from foot drop.

8. When should you see a physiotherapist or a doctor?

Do not regard foot drop as a trivial matter. If anyone has trouble lifting the front part of the foot, has a toe that drags when walking, develops unexpected numbness on the top of the foot, or notices a sudden change in gait, they should seek a medical evaluation as soon as possible. If foot drop starts suddenly, especially with back pain, leg weakness, or changes in bladder or bowel function, urgent assessment is needed, as it may indicate significant nerve root compression requiring timely treatment.

Early assessment is worthwhile even if the foot drop is only slight, since consistent evidence shows that early physiotherapy involvement leads to better functional recovery than waiting and treating later.

9. Preventive Measures

While not all causes of foot drop are preventable — particularly those from stroke, spinal disease, or systemic conditions — several practical steps can reduce risk from common compressive causes:

• Do not stay for long in a cross-legged position or in a squatting position, as this can cause compression of the peroneal nerve at the knee.
• Make sure that leg casts, splints, or braces are properly fitted and not too tight.
• For people who have diabetes, it is important to carefully manage their blood sugar levels because poor control of blood glucose raises the likelihood of suffering from compression neuropathies.
• It is better to deal with symptoms of low back pain or leg pain as early as possible rather than ignoring the early warning signs of radiculopathy.
• When you are in positions that involve continuous pressure on the outer side of the knee, take breaks, particularly during long operations, after a long period of lying in bed, or when traveling for an extended time.

10. The forecast for foot drop

The prognosis depends greatly on the cause and how early treatment starts. In cases of peroneal nerve compression at the knee treated surgically, most patients have a good recovery by 24 months. After peroneal nerve injury associated with knee replacement, about two-thirds of patients attain full neurologic recovery, some of them achieving complete recovery within one year.

About 60% of patients who have foot drop due to lumbar degenerative disease and are treated with spinal decompression regain normal or nearly normal muscle strength following the operation, and the vast majority experience at least some measurable improvement. Yet a significant number of patients do not fully recover, underscoring the importance of setting individualized expectations.

11. Conclusion

Foot drop can stem from a variety of causes, from simple nerve compression at the knee to more complex spinal, neurological, or systemic disorders. The good news is that in many cases, people can regain considerable function through accurate diagnosis, prompt physiotherapy, and—if necessary—specific medical or surgical treatment. Early evaluation matters because the better the long-term prognosis, the sooner clinicians can detect the underlying cause and begin rehabilitation.

12. Frequently Asked Questions (FAQs)

Q1. What is the main cause of drop foot?

The most common cause is damage or injury to the common peroneal nerve, typically occurring at the place where it rounds the head of the fibula just below the knee. After that, lumbar radiculopathy — specifically affecting the L5 nerve root as a result of a herniated disc or spinal stenosis — is the next most frequent cause, particularly in older people who have degenerative spine disease.

Q2. How do you fix a drop foot?

The treatment is wholly determined by the underlying cause. Usually, it includes a combination of physiotherapy (such as stretching, strengthening, gait training and, in some instances, electrical stimulation), the use of an ankle-foot orthosis to enable safe walking, and intervention aimed at dealing with the root cause—this might involve managing diabetes, relieving nerve compression, or in certain cases, surgical decompression or nerve transfer. In many cases, regular physiotherapy brings considerable improvement, but complete recovery is not guaranteed and varies with the severity and length of nerve involvement.

Q3. Is foot drop a red flag?

It certainly can. Although foot drop is a symptom, not a diagnosis, sudden or rapidly progressing foot drop—particularly when it is accompanied by back pain, weakness in both legs, or changes to the bladder or bowel—is a warning sign and demands an immediate medical evaluation since it could point to serious nerve compression or a spinal emergency. Similarly, cases of gradual foot drop should be assessed promptly rather than being left to be watched over time.

Q4. How long before a foot drop is permanent?

There is no fixed timetable, since recovery varies with the cause and severity of the nerve damage. Nerve injuries involving neurapraxia (a milder injury caused by compression) usually heal within weeks to a few months after the compression is removed. In more serious cases, it may take 12 to 24 months to reach maximal recovery, and recovery prospects generally improve when treatment begins early. If there is no improvement after a long period of appropriate rehabilitation, especially after 12 to 24 months, the deficit may become permanent. Nevertheless, in certain cases, surgery such as nerve transfer may still be considered.

Read more related articles:

1. Baxter's Nerve Entrapment
2. Heel Pain Exercises
3. High Ankle Sprain
4. Physical Therapy for Ankle Sprain

References

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2. Brief JM, Brief R, Ergas E, Brief LP, Brief AA. Peroneal nerve injury with foot drop complicating ankle sprain--a series of four cases with review of the literature. Bull NYU Hosp Jt Dis. 2009;67(4):374-7. PMID: 20001941.

3. Nori SL, Stretanski MF. Foot Drop. [Updated 2025 May 1]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK554393/

4. Lezak B, Massel DH, Varacallo MA. Peroneal Nerve Injury. [Updated 2024 Feb 25]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK549859/

5. Nath RK, Somasundaram C. Iatrogenic nerve injury and foot drop: Surgical results in 28 patients. Surg Neurol Int. 2022 Jun 23;13:274. doi: 10.25259/SNI_146_2022. PMID: 35855127; PMCID: PMC9282776.

6. Than CA, Hajeir MY, Al Darwashi LM, Silnes K, Haroon AM, Valiotis AK, Shibib D, Khair YJ, Milchem H, Iancu P, Dannawi Z. Characterizing Spinal Decompression for Foot Drop Caused by Lumbar Degenerative Disease: A Systematic Review and Meta-Analysis of Cohorts. J Clin Med. 2025 Jun 24;14(13):4470. doi: 10.3390/jcm14134470. PMID: 40648844; PMCID: PMC12249779.

7. Akhi MA, Hossain KMA, Tina S, Alim MA. Physiotherapy-Led Rehabilitation of Foot Drop Following Lower Limb Gunshot Injury. Clin Case Rep. 2026 Jan 24;14(2):e71930. doi: 10.1002/ccr3.71930. PMID: 41584386; PMCID: PMC12831205.

Medical Disclaimer: This article is intended for general educational purposes and does not replace individualized medical assessment. Foot drop can indicate a serious neurological or spinal condition. If you or someone you know is experiencing foot drop, please consult a licensed physiotherapist or physician promptly.

DR

Ajay Shakya

BPT, MPT (Neurological Conditions) · 10+ years of experience

Certified physiotherapist and manual therapist with over 10 years of clinical experience. Specializes in neurological rehabilitation, back pain, neck pain, and sports injuries.

BPT Graduation MPT Neurological Certified Manual Therapist

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