Lower limb bypass surgery (Lower limb (infra-inguinal) arterial bypass)

What is lower limb bypass surgery?

Lower limb bypass surgery is an operation to get blood flowing past a blocked or narrowed artery in the leg. The surgeon uses a graft — either one of your own veins or an artificial (synthetic) tube — to carry blood from above the blockage to below it, creating a new route for the circulation.

It is used for peripheral arterial disease when the blood supply to the leg is badly reduced. That might be to ease severe cramping pain on walking that has not improved with exercise and medicines, or — more urgently — to relieve pain at rest, help a wound or ulcer heal, or try to save a leg that is at risk (critical limb ischaemia).

The operation improves blood flow but does not cure the underlying artery disease. The graft itself can narrow or block over time, and other arteries can be affected, so medicines, not smoking and follow-up remain essential.

For more severe disease, surgery is usually considered by a vascular team alongside keyhole treatment (angioplasty) and, where a limb cannot be saved, honest discussion of amputation. The aim is always to choose the safest option that gives the leg the best chance.

Types & techniques

There isn't one single operation. The right approach depends on you — which is something to discuss with your surgeon.

Bypass surgery vs angioplasty for leg arteries

UK guidance generally suggests keyhole treatment (angioplasty) first where it is suitable, with bypass kept for blockages unsuitable for angioplasty or where angioplasty has not worked. For a threatened limb, a vascular team weighs both options together.

Preparing for your surgery

• You will have scans (ultrasound, CT or MRI angiogram) to map the blockages and plan where the graft will go.
• Heart and lung checks are often done, because many people with artery disease have heart disease too.
• Tell the team about all medicines, especially blood thinners; some are paused before surgery while antiplatelets are often continued.
• Stop smoking before surgery if you can — it strongly affects healing and whether the graft stays open.
• If a vein from your leg or arm will be used, the team will check it is suitable beforehand.
• Arrange help at home for several weeks, as walking and lifting are limited while you heal.
• Expect to start moving and walking soon after the operation to lower the risk of clots and chest problems.

What happens

Under a general anaesthetic, or a spinal or epidural that numbs the lower body, the surgeon makes cuts in the leg (and sometimes the groin) to reach the artery above and below the blockage. If your own vein is being used, it is prepared first.

The graft is stitched to the artery above the blockage and then to the artery below it, so blood flows through the new channel. The surgeon checks that blood is flowing well before closing the wounds, sometimes using X-ray pictures or a probe.

The operation often takes 2–4 hours depending on how long and complex the bypass is. Afterwards you are monitored closely, often in a high-dependency area, and the team checks the pulses and warmth of the foot regularly. Most people stay in hospital for several days.

Is this operation right for me?

A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.

Before you decide

Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.

Anaesthetic choices

The safest option depends on the operation, your health, the facility and your surgeon/anaesthetist. Ask what is planned and why.

This is major surgery, often in people who also have heart and lung disease, so the risks are real and depend a lot on whether it is planned or an emergency. In UK national data, the risk of dying in hospital after lower limb bypass is around 1% for planned (elective) operations and around 4–5% when done as an emergency. The graft can also narrow or block over time. Ask whether your surgery is planned or urgent, what your personal risk is, and what the plan is if the graft fails.

Published figures to discuss

Risk depends heavily on whether surgery is planned or an emergency, on your heart and lung health, and on where the bypass goes. Below-knee bypasses and synthetic grafts are more likely to narrow or block than above-knee vein grafts. UK national figures below are averages from the National Vascular Registry and do not predict any one person's outcome.

These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.

Recovery — what to expect, and when

Recovery from lower limb bypass takes weeks to months, and the leg circulation is then managed for life with medicines, not smoking and regular follow-up to check the graft.

• Leg swelling that can take several months to fully settle
• Numbness and tingling near the wounds, especially where a vein was taken
• Wound discomfort and a feeling of tightness that eases over weeks
• Tiredness and reduced stamina for several weeks

Aftercare

• Take your antiplatelet (such as aspirin or clopidogrel) and statin every day to help keep the graft open.
• Keep wounds clean and dry, and watch for signs of infection or a graft problem.
• Elevate the leg when resting to help swelling, as advised by your team.
• Build up walking gradually — it helps circulation and recovery — but avoid heavy lifting early on.
• Do not smoke and get help to stay stopped; this strongly affects whether the graft stays open.
• Take blood-pressure and diabetes medicines as prescribed and attend monitoring.
• Go to follow-up appointments and any arranged graft surveillance scans, and report returning symptoms.

• Help at home arranged for several weeks
• List of medicines, especially antiplatelets and statin
• Plan for wound checks with GP or district nurse
• Knowledge of warning signs for a blocked graft (cold, pale, painful leg)
• Clinic or ward contact number saved
• Smoking-cessation support arranged if you smoke
• Follow-up and graft-surveillance appointments noted

Scars and how they heal

You will have one or more wounds in the leg, and often the groin, along the line of the bypass; if your own vein is used, there will be additional wounds where it was removed. Scars are firm and pink at first and fade over months. Numbness around the wounds is common and improves slowly. Tell your team if a wound becomes red, hot, painful or starts to leak, as wound healing problems can occur.

⚠ Get urgent help if…

• The leg or foot becoming suddenly cold, pale, numb or very painful — a possible blocked graft; seek urgent help
• Bleeding from a wound that does not stop, or a rapidly swelling, painful wound
• Increasing redness, heat, swelling or discharge from a wound (possible infection)
• Fever or feeling generally very unwell
• Chest pain, breathlessness, or a swollen, painful calf (possible clot)
• A wound that splits open or exposes the graft

Who to contact: your surgeon or clinic first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.

General guidance — it doesn't replace the specific advice your surgeon gives you.

Results & realistic expectations

A good result is improved blood flow to the leg — easing rest pain, helping a wound heal, or improving how far you can walk — with wounds that heal well. For a threatened limb, success means avoiding or delaying amputation.

Surgery improves the circulation but does not stop the underlying disease. The graft can narrow or block over time, and other arteries can be affected, so the leg's circulation needs ongoing care. How well the result lasts depends on the type of graft, where it goes, and how well risk factors — especially smoking — are managed.

Vein grafts generally stay open longer than synthetic ones, and bypasses above the knee tend to last longer than those reaching below it. Some grafts narrow or block over the years and may need further treatment, which is why follow-up scans (graft surveillance) are often arranged. Keeping the graft open is helped by antiplatelet medicines, a statin, controlling blood pressure and diabetes, regular walking and, above all, not smoking.

Combining with other procedures

Bypass surgery is part of overall management of artery disease, alongside best medical treatment — antiplatelet medicines, a statin, blood-pressure and diabetes control — and stopping smoking. It is sometimes combined with, or follows, angioplasty when keyhole treatment alone is not enough, and for a threatened limb it is planned by a vascular team weighing all the options together.

Follow-up & long-term care

You will usually be reviewed around 6–8 weeks after surgery, with ongoing graft-surveillance scans in many cases to check the graft stays open. Your GP and vascular team manage your risk factors and medicines long term. If the leg becomes painful, cold or pale, seek help urgently rather than waiting, as the graft may have blocked.

• Take antiplatelet and statin medicines every day, long term
• Attend graft-surveillance scans as arranged
• Keep walking and stay active within your limits
• Control blood pressure, cholesterol and diabetes
• Do not smoke, and seek help to stay stopped
• Report any return of leg pain, coldness or wound problems promptly

Revision and secondary surgery reality

• Grafts can narrow or block, sometimes needing further keyhole treatment or another operation.
• A blocked graft can cause the leg to worsen acutely and need urgent treatment.
• Graft surveillance scans aim to catch narrowing before the graft blocks.
• If the limb cannot ultimately be saved, amputation may become necessary despite surgery.

Ask your surgeon for their own revision rate, what counts as a revision, and what is included in the written aftercare policy.

What good aftercare looks like

• Clear warning signs for a blocked graft and instructions to seek urgent help.
• A named contact for wound and graft concerns in the early weeks.
• A definite plan for antiplatelet and statin medicines and who reviews them.
• Arranged graft-surveillance scans and easy re-referral if symptoms return.
• Active support to stop smoking and to control blood pressure, cholesterol and diabetes.

What affects the cost

Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:

• Whether the operation is planned or an emergency, which affects the whole pathway
• Whether your own vein or a synthetic graft is used
• The length and complexity of the bypass (above-knee versus below-knee)
• Surgeon and anaesthetist fees and the type of anaesthetic
• Theatre time, high-dependency care and length of hospital stay
• Scans before surgery and graft-surveillance scans afterwards
• Follow-up appointments and any further treatment if the graft fails

• The surgeon's and anaesthetist's fees
• Hospital, theatre and high-dependency/ward costs
• All scans before and after surgery, including graft surveillance
• Follow-up appointments
• What happens — and what it costs — if the graft blocks or a complication needs further surgery
• Cancellation policy if the operation is postponed for medical reasons

On the NHS? Lower limb bypass is provided on the NHS for poor leg circulation, often urgently when a limb is threatened; it is not a cosmetic or self-pay procedure.

You're entitled to your total cost in writing — including aftercare and any revision — before you decide.

Consent traps and marketing red flags

These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.

Choosing a surgeon safely

• Check your surgeon is on the GMC Specialist Register for this area.
• Make sure they practise at a CQC-registered location, and look for membership of bodies like BAAPS or BAPRAS.
• You're entitled to a two-stage consent process with time to reflect (a cooling-off period). The surgeon who will operate must consent you — not a salesperson.
• Be wary of pressure: time-limited offers, discounts or deposits taken before you've had time to think are red flags, not bargains.
• You're entitled to your total cost in writing — including aftercare and any revision — before you decide.

How Vuemedics verifies every consultant →

Take this to your consultation. A good surgeon will welcome every one of these.

• Is my surgery planned or urgent, and how does that change my risk?
• Will you use my own vein or a synthetic graft, and where will the bypass go?
• What is my personal risk of serious complications, given my heart and lungs?
• Would angioplasty be a reasonable alternative for me first?
• What is the plan, and the realistic outlook for my leg, if the graft narrows or blocks?
• What follow-up and graft-surveillance scans will I have?
• Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
• Will you be the surgeon who carries out my operation, and who looks after me afterwards?
• What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
• What does a realistic result look like — and what can this operation not achieve?
• What are my options, including waiting, doing nothing for now, or choosing a different approach?
• Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
• What is the total cost in writing, including any follow-ups, and how much time do I have to decide?

Find a verified surgeon for lower limb bypass surgery

Every consultant is GMC-checked and independently reviewed. Search by postcode and distance, or switch to a map. Ordered by rating, relevance and recency — never by who pays.

How we made this page

Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →

Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.

Sources & standards: NHS — Peripheral arterial disease: treatment NICE CG147 — Peripheral arterial disease: recommendations Guy's and St Thomas' NHS — Femoral bypass surgery National Vascular Registry — 2024 State of the Nation report Circulation Foundation — Peripheral arterial disease

Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.

Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.