Foot Drop Surgery: Freeing the Nerve in the Back or at the Knee

What Is Foot Drop Surgery?

Foot drop surgery takes pressure off the nerve that lifts the front of your foot. Most often, that pressure comes from a herniated disc in the lower back. In other cases, the peroneal nerve gets trapped beside the knee.

However, foot drop itself is not a disease. Instead, it is a sign that a nerve has stopped carrying its signal well. So the operation goes where the nerve suffers, usually the spine or the outer knee.

Above all, timing matters here. A nerve freed in the first weeks has a real chance to recover. In contrast, months of pressure leave the muscles thin and weak.

At a Glance

• What it meansWeak lifting of the foot and toes, so the toes catch when you walk
• Two main sourcesA disc or narrow canal in the lower back, or a trapped nerve at the knee
• Key testsStrength exam, lumbar MRI, EMG and nerve conduction studies
• Nerve surgeryLumbar decompression or peroneal nerve release, aimed at the cause
• Best windowUsually the first weeks after weakness starts
• Support meanwhileAn ankle brace (AFO) and physiotherapy while the nerve heals

Where Are You in Your Decision?

Pick the line that sounds most like you. Each one then opens the matching part of this guide.

1. 01I do not know where my foot drop comes fromHow doctors tell a back cause from a knee cause→
2. 02My foot got weak suddenlySigns that need care today, not next month→
3. 03I want to know if I need surgeryStrength grades, timing and the window for recovery→
4. 04I want to compare my treatment optionsBrace, physiotherapy, nerve surgery and tendon transfer→
5. 05I want to know how long recovery takesWhat the first weeks and months usually look like→
6. 06I am planning treatment abroadRecords to bring, length of stay and flights→

Is Your Foot Drop Coming From the Back or the Knee?

This question decides the whole plan. A disc in the lower back needs spine surgery. A trapped nerve at the knee, however, needs a small local operation.

The peroneal nerve lifts the foot, and its fibers come mainly from the L4 and L5 roots. Below the knee, it wraps around the head of the fibula just under the skin. So pressure at either point can produce the same weak foot.

The Hip Muscle Clue

Your hip muscles give the most practical clue. That is because the L5 root feeds both the foot lifters and the muscle that moves the leg outward. By contrast, the peroneal nerve sends no branch to the hip.

So weak hip muscles point to the back. On the other hand, strong hip muscles with a weak foot point to the knee.

When Both Places Are Involved

Some people have pressure in both places at once, which doctors call a double crush. A nerve already strained in the back gives way faster at the knee. So an EMG helps settle the plan.

Questions at this stage

When Is Foot Drop an Emergency?

Foot drop that appears over hours or days needs a same-day assessment. Slow weakness over months can wait for a planned visit, but not for long.

The last two signs can mean cauda equina syndrome. This emergency needs surgery within hours, so never plan a trip abroad first.

Also, watch for one tricky pattern. Severe leg pain sometimes stops suddenly and weakness takes its place. That change is not healing; instead, it can mean the nerve has stopped working.

What Causes Foot Drop?

Doctors trace the nerve from the spine down to the foot, since this finds the cause fastest. The table below shows the main causes, their usual story and their clue.

Foot Drop Without Pain

Painless foot drop deserves extra care, because it often points to a nerve or muscle disease. Likewise, weakness in both feet rarely comes from one trapped nerve. So your doctor then checks the spinal cord and general nerve health.

In addition, a cause inside the brain or spinal cord works differently. For example, stiffness and spasm after a stroke need spasticity treatment rather than nerve release.

When Do You Need Surgery for Foot Drop?

In practice, two measures drive the decision: how weak the foot is and how long the weakness has lasted. When lifting strength falls below grade 3, most surgeons no longer wait.

Why Waiting Costs Strength

Pressure removed in the first weeks leaves the nerve a chance to repair. After months of pressure, however, the muscles waste and the gain shrinks. So the thought "my pain is better, I will wait a little" is risky when the foot stays weak.

Physiotherapy, moreover, cannot lift a disc off a nerve. It builds strength and balance, but mechanical pressure needs a mechanical answer.

Foot Drop Treatment Options Compared

Treatment follows the cause and the degree of weakness, so no single plan fits everyone. The table below compares the main options side by side.

What an Ankle Brace Does

An ankle-foot orthosis (AFO) is a light support that holds the foot at a right angle. So your toes clear the floor and you walk more safely. It also spares the hip and knee from extra effort.

However, a brace bridges the gap while the nerve heals; it does not treat the cause. So keep looking for the source while you wear it.

When Tendon Transfer Comes In

In this case, tendon transfer moves a working tendon, often from the back of the leg, to lift the foot. It is one of the options when the nerve can no longer recover. Because this is foot and ankle surgery, an orthopedic team plans it together with your neurosurgeon.

Surgery for Foot Drop From a Herniated Disc

When a disc presses on the L5 root, the operation removes the pressing fragment and frees the root. This is a lumbar decompression, usually a microdiscectomy through a small opening.

First, under the microscope, the surgeon moves the nerve gently aside and lifts out the loose disc piece. Leg pain often eases within days. Strength, by contrast, returns more slowly, because the nerve has to repair.

Our herniated disc surgery guide compares microdiscectomy and endoscopic options in detail. If the cause is a narrow canal instead, see spinal stenosis surgery. A slipped vertebra can press the same root, as our spondylolisthesis guide explains.

Peroneal Nerve Decompression at the Knee

Peroneal nerve decompression frees the nerve where it wraps around the fibula below the knee. The surgeon opens the tight band over the nerve and clears scar from its surface.

Often, a short curved cut beside the fibular head is enough, and Prof. Albayrak co-authored a published series on it. In that series, it helped limit scar, pain and wound trouble. Doctors also call the procedure peroneal neurolysis.

Similarly, if a cyst or a nerve sheath tumor causes the pressure, the surgeon removes it in the same session. Our guide to peripheral nerve entrapment covers this and other trapped nerves, such as the wrist and elbow.

Foot Drop Surgery Recovery Time

In short, recovery comes in two speeds. Pain usually eases in days, while strength returns over weeks to months. That is because nerve fibers regrow about one millimetre a day.

What Shapes Your Result

Three factors weigh most: the depth of weakness, its length and the type of nerve damage. Partial damage carries a good outlook, while a fully cut nerve does far worse.

Early gains matter as well. If strength improves by one grade within the first three months, further progress becomes much more likely.

Daily Life While the Nerve Heals

Meanwhile, fall prevention comes first. So fix loose rug edges, mark the steps and use a night light. Wear flat, lace-up shoes with a firm heel, because slippers make tripping easier.

Also check a numb foot every day, since small wounds or hot water can go unnoticed.

Coming to Istanbul from the US, Canada, the UK or Europe

Slow, stable foot drop therefore allows a planned trip. Sudden or worsening weakness, however, needs local emergency care first, because the window for recovery is short.

Records to Bring

• Your lumbar MRI, and any knee scan, on a disc or USB drive with reports
• EMG and nerve conduction reports, with their dates
• The date your weakness began and how it changed since
• Operation reports if you had back, knee or hip surgery before

How Long to Stay in Istanbul

First, plan a few days for the consultation and any new tests, and after a microdiscectomy or a peroneal nerve release, the hospital stay is usually short. Overall, many people plan about a week to ten days. Your surgeon then confirms this for your case.

When You Can Fly Home

The UK CAA sets no separate waiting time for spine or nerve surgery, so your surgeon decides when you can fly. The US CDC also notes that flying soon after surgery raises the risk of blood clots. So walk the aisle and keep your legs moving.

Then, back home, your local doctor and physiotherapist carry on the follow-up with your discharge summary.

For insurance and Medicare, see planning surgery in Turkey from the US. For NHS rules, see planning from the UK. From Canada, check with your provincial health plan and private insurer before you book.

Your Spine and Nerve Surgeon in Istanbul

Prof. Dr. Serdar Baki Albayrak

Neurosurgeon · Full Professor of Neurosurgery

Prof. Albayrak treats foot drop at its source. For example, he performs lumbar decompression for disc and canal problems and peroneal nerve release at the knee. He co-authored a published series on peroneal nerve injury at the knee level.

After medical school at Marmara University, he trained in neurosurgery at Istanbul University. Clinical fellowships at the University of Helsinki and Harvard Medical School followed.

27+Years

5,000+Operations

64Countries

33Publications

Figures from Prof. Albayrak's professional profile, September 2026. See his full publication list.

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