Foot drop

Also called: Peroneal nerve palsy; drop foot; a foot that slaps or catches when walking; weak ankle lift

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A foot that will not lift, so it drags, slaps or catches when walking. The muscle that lifts it has lost its nerve supply - most often where the nerve wraps round the outside of the knee, sometimes from a disc, sometimes from the brain - and the cause determines everything.

How common: Peroneal neuropathy is the commonest nerve palsy in the leg, at about 19-40 per 100,000; foot drop also follows slipped discs, strokes and multiple sclerosis, so the total is far higher

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What it is

Foot drop is weakness of dorsiflexion: the tibialis anterior and its neighbours cannot lift the front of the foot. The result is a foot that slaps on landing, or that catches on the ground during swing, and a compensatory high-stepping or hip-hitching gait.

The cause matters more here than in almost anything else on this site. Compression of the peroneal nerve at the outside of the knee is common, often reversible, and has an identifiable trigger - crossed legs, a tight cast, prolonged kneeling, rapid weight loss removing the fat pad that protects the nerve. A lumbar disc pressing on the L5 nerve root, or a central cause such as a stroke or motor neurone disease, needs entirely different management. This is a symptom that needs a diagnosis, not a programme.

What it feels like

The foot slapping down audibly with each step
Catching the toes on the ground and tripping
Lifting the knee higher than usual to clear the foot
Numbness over the top of the foot and the outside of the shin
Difficulty walking on the heels on that side

What causes it

Most people have more than one of these at once, and they feed each other. Read the list looking for the two or three that sound like your week rather than for the one true answer — the ones that describe you are the ones worth acting on.

Peroneal nerve compression at the knee: The common peroneal nerve wraps round the outside of the fibula just below the knee, where it is close to the skin with little protection. Compression there is the commonest cause and it is often reversible once the compression is removed.
Habitual leg crossing: Sitting with one leg crossed over the other presses the nerve against the bone. Prolonged or habitual crossing, particularly in someone thin, is a genuine and well-documented cause.
Rapid weight loss: The fat pad protecting the nerve at the knee is lost, exposing it to compression from ordinary positions. Foot drop after significant weight loss or during illness is a recognised pattern.
Prolonged kneeling or squatting: Occupational kneeling, gardening for hours or a long squatting position compresses the nerve directly.
A tight cast, brace or bandage: External compression at the knee from a cast or dressing is a classic iatrogenic cause and is why casts are checked for it.
L5 nerve root compression: A lumbar disc herniation compressing the L5 root produces the same weakness with back and leg pain and a different sensory pattern. Progressive weakness from this cause is a reason for urgent assessment.
Stroke and central causes: Damage to the brain or spinal cord produces foot drop with different features - increased tone, brisk reflexes and often weakness elsewhere. Sudden onset needs emergency assessment.
Peripheral neuropathy and motor neurone disease: Progressive, sometimes bilateral foot drop can be the presenting feature of a generalised neuropathy or of motor neurone disease, which needs neurological diagnosis.
Diabetes: Both through generalised neuropathy and through making the nerve more vulnerable to compression at the knee.
Hip or knee surgery: The nerve can be injured during joint replacement or fracture fixation, or compressed by positioning during a long operation.

Who tends to get it

Anyone who habitually crosses their legs, particularly if thin
People who have lost weight rapidly or been ill and immobile
Anyone in a cast or brace at the knee
People with diabetes, in whom nerves are more vulnerable to compression
Anyone with lumbar disc problems or a neurological diagnosis

What makes it worse, and what settles it

Makes it worse

Continuing whatever is compressing the nerve, which is often unrecognised
Crossing the legs, kneeling for long periods or leaning on the outside of the knee
Walking without an ankle support, which risks trips and falls
Assuming it will resolve without finding out what caused it
Delay in a case caused by disc compression, where recovery is time-sensitive

Settles it

Getting a diagnosis, which determines everything else - this is not a symptom to self-treat
Removing the compression where that is the cause, which often allows full recovery
An ankle-foot orthosis, which restores a safe gait immediately while recovery happens
Dorsiflexor strengthening and ankle range work to prevent a fixed contracture
Balance and gait training, since the trip risk is the main immediate danger

What actually helps

The short version: The muscle that lifts the foot - tibialis anterior - has lost its nerve supply, most often where the peroneal nerve wraps round the outside of the knee (crossed legs, a tight cast, kneeling, rapid weight loss), sometimes from a disc pressing on the L5 root, sometimes from the brain after a stroke. The foot drags, the person hikes the hip to clear it, and trips

Strength work: Legs: Calves: Tibialis Anterior - resisted dorsiflexion with a band and toe raises, many repetitions, daily, which drives both nerve recovery and the brain relearning; Feet, Toes, Ankles; Legs: Calves: Peroneals (Fibularis); Glutes: Med; Legs: Quads; Walking with the brace

Stretching: Legs: Calves; Legs: Calves: Achilles Tendon - a foot that cannot lift shortens the calf within weeks and that has to be prevented; Feet, Toes, Ankles

Massage: Legs: Calves; Legs: Calves: Tibialis Anterior - light, around the shin

Also worth doing: An ankle-foot orthosis from day one for safe walking; stop crossing the legs and kneeling on the outside of the knee; nerve studies to find where the damage is, because a nerve entrapment, a disc and a stroke are treated differently; electrical stimulation from a physiotherapist

What the evidence says: Most compression-related peroneal palsies recover over weeks to months once the cause is removed, and rehabilitation - resisted dorsiflexion, balance and gait training with an orthosis - is the standard care whatever the cause. Tier D because the cause must be found first: a nerve at the knee, a disc in the back and a stroke look identical at the foot.

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The qFIT routine for this

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Get it checked if…

Foot drop that appeared suddenly with back pain, or with weakness elsewhere, numbness in the saddle area, or bladder change - urgent, this can be a disc pressing on the nerve root; foot drop with facial droop, arm weakness or speech change - stroke, call emergency services

And whatever the body part: chest pain or unusual breathlessness on exertion; a fever alongside the pain; unexplained weight loss; pain that is constant and unrelated to how you move; new numbness, weakness or loss of bladder or bowel control; or one calf that is swollen, warm and painful. Any of those, stop and get assessed.

How it usually goes

Compression at the knee, once relieved, often recovers substantially over three to six months, sometimes longer, and a brace makes walking safe in the meantime. Recovery from a disc-related cause depends on how quickly the pressure is relieved. Central causes follow their own course. The single most important step is a proper diagnosis: sudden foot drop, foot drop with back pain and progressive weakness, or foot drop with other neurological symptoms all need prompt medical assessment rather than exercises.

Prevalence basis: Peroneal nerve entrapment reviews; StatPearls foot drop

Others the same routine covers

These share the Movement for Neurological Conditions routine, so the work is the same. If one of them also sounds like you, that is a reason to expect more from it, not less.

This is general information, not a diagnosis, and it cannot examine you. If it matches you, use it to ask better questions of a clinician rather than to replace one.

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