Free flap reconstruction (Free tissue transfer (microvascular free flap))
A major operation that moves a block of the body's own tissue, with its blood vessels, to rebuild an area, reconnecting the vessels under a microscope.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- A free flap moves your own tissue, with its blood vessels, to rebuild an area — the vessels are reconnected under a microscope.
- It is major surgery with a donor-site scar and a longer recovery than a graft or local flap, but it uses your own living tissue.
- The flap is watched very closely for the first few days; most failures show within 72 hours and need urgent surgery to try to save it.
- Free flaps have high success rates, but flap failure, although uncommon, is a real risk you should understand before agreeing.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your surgeon will give you advice for your situation.
Rebuilds an area using your own living tissue, which can look and feel natural
People who are not fit enough for a long general anaesthetic and major surgery may be safer with a simpler reconstruction.
You are monitored closely, often in a high-observation area, with very frequent flap checks. Most blood-supply problems show in this window, so prompt...
Close, frequent flap monitoring by a trained team in the critical early days.
You are monitored closely, often in a high-observation area, with very frequent flap checks. Most blood-supply...
As the flap stabilises, you start to move more, drains come out, and pain is managed. The donor site is also...
You gradually build up activity. Avoid heavy lifting and strenuous activity, especially anything that strains the...
Strength and energy return over weeks to months. Scars soften and settle. Some sensation changes can be...
What is free flap reconstruction?
A free flap is a block of the body's own tissue — skin, fat, and sometimes muscle or bone — that is taken from one part of the body (the donor site) together with its blood vessels, and moved to rebuild a different area. The blood vessels are then joined to vessels at the new site under a microscope, which is why it is also called microsurgery or free tissue transfer.
It is a major operation used when simpler methods would not work — for example to rebuild a breast after mastectomy (such as a DIEP flap using lower-tummy tissue), to reconstruct the head and neck after cancer surgery, or to repair large or complex wounds elsewhere.
Because the blood vessels are reconnected, the flap has a fresh blood supply at its new home. The first few days are critical: the team checks the flap very frequently, because if the new blood supply blocks, the flap needs urgent surgery to try to save it. Most problems show up within the first three days.
Free flap reconstruction can give a natural, long-lasting rebuild using your own tissue, but it is bigger surgery, with a donor-site scar and a real, if uncommon, risk that the flap fails. Your team will explain whether it is the right choice for you.
Types & techniques
There isn't one single operation. The right approach depends on you — which is something to discuss with your surgeon.
Free flap vs local flap or graft
| Free flap | Local flap / graft | |
|---|---|---|
| Tissue source | Distant site, vessels reconnected | Nearby skin, or skin without vessels |
| Size of surgery | Major, several hours | Smaller, often local anaesthetic |
| Recovery | Weeks to months | Days to weeks |
| Used for | Large/complex rebuilds | Smaller defects |
A free flap is usually reserved for larger or more complex reconstructions where simpler methods would not give a good result.
Preparing for your surgery
- Make sure you understand why a free flap is recommended, which donor site is planned, and what scars to expect at both the rebuilt area and the donor site.
- Stop smoking and avoid nicotine well before surgery — smoking strongly increases the risk of flap and wound problems.
- Tell the team about all medicines, especially blood thinners, and any clotting problems in you or your family.
- Optimise your general health beforehand (for example diabetes, weight, nutrition and any heart or lung conditions), as this is major surgery.
- Plan for a hospital stay of several days and a longer recovery at home, with help arranged.
- Ask about how the flap will be monitored after surgery and what the signs of a problem are.
- Discuss what happens if the flap fails, including whether another reconstruction would be possible.
What happens
Free flap reconstruction is done under general anaesthetic and often takes several hours. One surgical team usually raises the flap — the chosen block of tissue with its artery and vein — from the donor site, while the area being rebuilt is prepared. The donor site is then closed.
The flap is moved to its new position and its artery and vein are stitched to blood vessels there, using a microscope and very fine sutures. Once the surgeon is satisfied the flap has a good blood supply, the area is shaped and closed.
Afterwards you are looked after in a closely monitored ward or unit. Nurses and doctors check the flap's colour, warmth and blood flow very frequently — often hourly at first — because spotting a blocked blood vessel early gives the best chance of saving the flap with urgent surgery.
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.
May not be suitable if…
- People who are not fit enough for a long general anaesthetic and major surgery may be safer with a simpler reconstruction.
- Heavy smokers and those with significant clotting or blood-vessel disease have a higher risk of flap failure.
- If a simpler method (graft, local flap or implant) would give a good result, a free flap may not be justified.
- A suitable donor site and recipient blood vessels are needed; previous surgery, radiotherapy or scarring can make this difficult.
Delay surgery if…
- There is active infection or you are medically unwell.
- Blood-thinning medicines or a clotting problem need managing first.
- Diabetes, nutrition, weight or other conditions could be optimised before major surgery.
- You are still smoking and there is time to stop, to reduce the risk of flap and wound problems.
- You cannot yet arrange the help and time off that recovery requires.
Alternatives to discuss
- A simpler reconstruction such as a local flap or skin graft.
- An implant-based reconstruction (for example for the breast), with its own pros and cons.
- Delayed reconstruction, doing it later rather than at the same time as cancer surgery.
- No reconstruction, or an external prosthesis, depending on the situation.
- A specialist multidisciplinary discussion to choose the best option.
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.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Anaesthetic choices
The safest option depends on the operation, your health, the facility and your surgeon/anaesthetist. Ask what is planned and why.
Benefits
- Rebuilds an area using your own living tissue, which can look and feel natural
- Can reconstruct large or complex defects that simpler methods cannot
- Provides durable, long-lasting cover with its own blood supply
- For breast reconstruction, can give a soft, natural result without an implant
- Allows reconstruction of structures such as the jaw using transferred bone
Risks & complications
- A scar and altered sensation at the donor site as well as the rebuilt area
- Pain, swelling and tiredness for several weeks after major surgery
- Bruising and temporary numbness
- A collection of fluid (seroma) at the donor site
- Wound infection or delayed healing at either site
- Bleeding or a blood clot needing a return to theatre
- Partial loss of the flap, with some tissue not surviving
- Weakness or bulging at the donor site (for example the tummy after some flaps)
- A blood clot in the leg or lung (DVT or PE) after major surgery
- Complete flap failure, where the blood supply cannot be saved and the flap is lost
- Needing a further major operation, including another reconstruction
- Serious anaesthetic or medical complications associated with long surgery
The biggest flap-specific risk is the new blood supply blocking, which can cause the flap to fail. This is why the team checks the flap so often in the first few days, and why urgent surgery may be needed to try to save it. Smoking, clotting problems and other health conditions raise the risk. Ask your surgeon about the team's flap-failure and salvage rates, how the flap will be monitored, and what would happen if it could not be saved.
Published figures to discuss
Free flap success rates are high in experienced microsurgical units, but flap failure, return to theatre and donor-site problems are real risks. Most blood-supply problems appear within the first 72 hours, and the chance of saving a struggling flap drops the longer a problem goes unrecognised. Figures vary by flap type, unit and patient, so the ranges below are cautious and not personal predictions.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Overall free flap success | High — commonly reported above 95% | Success depends on the flap type, the unit's experience and patient factors such as smoking and clotting risk. | Quality of life and outcomes after microvascular free flap reconstruction (PMC)pmc.ncbi.nlm.nih.govPublished figure |
| Complete flap failure (DIEP breast reconstruction) | Low — around 1–2% in reported series | Other free flaps vary; some have higher reported failure rates than DIEP. | Quality of life and outcomes after microvascular free flap reconstruction (PMC)pmc.ncbi.nlm.nih.govPublished figure |
| Return to theatre for a blood-supply problem | Reported in roughly the low-to-mid single figures, up to higher in some series | Most failing flaps show within 72 hours, so close early monitoring is essential for salvage. | Guide sourcesClinical context |
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
This is major surgery, so recovery is longer than for a graft or local flap. The first few days focus on monitoring the flap; the following weeks are about regaining strength and caring for two healing areas.
- Significant tiredness for several weeks after major surgery
- Swelling, bruising and numbness at both the rebuilt area and the donor site
- Tightness at the donor site, for example across the tummy after a DIEP flap
- Firm, raised scars that soften and fade over months
- A gradual, stepwise return of energy rather than a quick recovery
Aftercare
- Follow all monitoring and movement instructions closely in the early days — they help protect the flap.
- Take pain relief as prescribed and build up activity gradually as advised.
- Avoid heavy lifting and strenuous activity, especially anything that strains the donor site, until cleared.
- Do not smoke, as it reduces blood supply and harms healing.
- Care for both wounds as instructed and keep an eye out for infection.
- Watch for signs of a blood clot in the leg or lung and seek urgent help if they occur.
- Attend follow-up appointments and any planned refining surgery.
- Ask about physiotherapy or exercises to help recovery, especially at the donor site.
- Help at home arranged for several weeks
- Time off work booked (often several weeks)
- Understanding of activity limits, especially for the donor site
- Pain relief and any prescribed medicines ready
- Knowledge of flap and clot warning signs and who to contact
- Transport arranged for follow-up appointments
- Support for emotional recovery, especially after cancer surgery
Scars and how they heal
Free flap reconstruction leaves scars in two places: where the area is rebuilt and at the donor site, which can be a long scar (for example across the lower tummy with a DIEP flap, or on the leg, back or thigh). Scars are firm and raised at first and soften and fade over many months. There may also be changes in contour or sensation. Your surgeon should show you where the scars will be and explain how they are likely to settle.
⚠ Get urgent help if…
- Any change in the flap's colour (pale, dusky, blue or mottled) or temperature — this is an emergency
- Increasing pain, swelling or bleeding at the flap or donor site
- Redness, heat, swelling or pus, or fever (signs of infection)
- A swollen, painful calf, or breathlessness or chest pain (possible clot — seek emergency help)
- A wound coming apart or a sudden increase in drainage
- Feeling generally very unwell after surgery
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 means the flap survives with a healthy blood supply, the area is rebuilt with natural-looking and durable tissue, and both sites heal. Free flaps have high success rates in experienced hands, and reconstruction with your own tissue can feel and age more naturally than other methods. However, results take months to settle, sensation may not fully return, and minor refining surgery is sometimes needed.
If the reconstruction follows cancer surgery, the flap rebuilds the area but does not change the cancer outcome — that depends on the cancer treatment and the laboratory results, guided by the specialist team.
Once healed, a free flap provides long-lasting reconstruction using your own living tissue, which can change with your body over time (for example with weight changes). It does not need replacing in the way an implant might. Sensation and contour can keep improving for a year or more. If the flap followed cancer surgery, ongoing cancer follow-up continues as advised by your team.
Combining with other procedures
Free flap reconstruction is often done as part of cancer treatment — for example immediately after a mastectomy or head and neck cancer removal — so the rebuild happens in the same operation as, or soon after, the cancer surgery. It may be combined with other procedures, and minor refining operations are sometimes planned later. Your team will explain the overall plan and timing.
Follow-up & long-term care
You will be reviewed in hospital while the flap settles, then in clinic over the following weeks and months to check healing of both sites and the final result. Further minor surgery to refine the reconstruction is sometimes arranged. If the flap followed cancer surgery, cancer follow-up runs alongside. You should have a named contact for any concerns during recovery.
- Follow donor-site exercises or physiotherapy to regain strength
- Protect scars from the sun while they mature
- Maintain a stable weight, as flaps made of fat can change with weight
- Attend any planned refining surgery and follow-up
- Continue cancer follow-up and self-checks if the flap followed cancer surgery
Revision and secondary surgery reality
- Urgent return to theatre may be needed if the blood supply blocks, to try to save the flap.
- Minor refining surgery to improve shape or symmetry is commonly planned later.
- If a flap is lost, a further reconstruction (another flap or a different method) may be discussed.
- Donor-site problems, such as bulging or weakness, can occasionally need correction.
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
- Close, frequent flap monitoring by a trained team in the critical early days.
- A clear escalation plan and rapid access to theatre if the flap is threatened.
- Named contacts and clear warning-sign advice for after discharge.
- Physiotherapy and donor-site rehabilitation as needed.
- Coordinated cancer follow-up and any planned refining surgery.
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:
- The type of free flap and the complexity of the reconstruction
- The length of the operation and whether more than one surgical team is involved
- The length of hospital stay, including any high-dependency monitoring
- Whether bone or specialised tissue is included
- Any further refining surgery planned later
- Follow-up appointments, physiotherapy and management of any complications
- The surgical team's fee and what the operation covers
- Anaesthetic fees for a long general anaesthetic
- Hospital stay and high-observation monitoring costs
- Whether later refining surgery is included or charged separately
- Follow-up appointments and physiotherapy
- What happens, and what it costs, if the flap fails or a complication occurs
- If cancer-related, how results and ongoing care are coordinated
On the NHS? Free flap reconstruction is routinely done on the NHS when clinically needed, such as after breast or head and neck cancer surgery; private care may be used for speed or choice of surgeon.
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.
Consent traps
- Not making clear that flap failure, although uncommon, is a real possibility.
- Underplaying the size of the surgery, the hospital stay and the donor-site scar.
- Not discussing the plan if the flap fails or cannot be saved.
- Not explaining how smoking and other factors change the risk.
- No clear account of monitoring, recovery and any later refining surgery.
Marketing red flags
- Implying flap surgery is without risks or always succeeds.
- Not mentioning the donor-site scar or its after-effects.
- Downplaying the length of recovery and time off.
- Quoting only the best-case result without the failure and revision possibilities.
- Pressure to choose a free flap when a simpler option would suit.
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.
Questions to ask your medical professional
Take this to your consultation. A good surgeon will welcome every one of these.
- Why is a free flap the best option for me rather than a simpler reconstruction or an implant?
- Which donor site will you use, and what scar and after-effects will it leave?
- What are your unit's flap success and salvage rates, and how will the flap be monitored?
- What happens if the flap fails — could it be reconstructed another way?
- How long will I be in hospital and off work, and what are my activity limits?
- Will I need any further refining surgery later?
- 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?
Frequently asked questions
Why is this bigger surgery than a graft or local flap?
How likely is the flap to fail?
Why is the flap checked so often after surgery?
What scars will I have?
How long is the recovery?
Can I have this on the NHS?
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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: Current techniques for postoperative monitoring of free flaps (PubMed) Quality of life and outcomes after microvascular free flap reconstruction (PMC) Inpatient flap monitoring after DIEP breast reconstruction (PubMed) Outcome after urgent microvascular revision of free DIEP/SIEA/SGAP flaps (PubMed) Salvage versus non-salvage abdominal free flap breast reconstruction (PMC) NICE NG101 — Early and locally advanced breast cancer: diagnosis and management (2018) NICE NG36 — Cancer of the upper aerodigestive tract: assessment and management (2016) BAPRAS — Breast reconstruction: patient information (British Association of Plastic, Reconstructive and Aesthetic Surgeons, 2018)
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.
Related guides: Local flap reconstruction · Skin graft · Melanoma surgery (wide local excision) · Basal cell carcinoma surgery · Scar revision