Medical Oncologist
CION Cancer Clinics
What a free flap actually is | CION Cancer Clinics
A free flap is a piece of your own tissue, such as skin, fat, muscle or bone, lifted from one part of the body with its own artery and vein. It is moved to fill the gap left by cancer surgery, and its vessels are joined to new ones under a microscope. It is used most after head and neck cancer surgery, and it is a long operation. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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The short answer
What is a free flap?
A free flap is a piece of living tissue taken from one part of your body, together with its own small artery and vein, and moved to fill a gap left by cancer surgery somewhere else. The vessels are cut free and then joined to vessels near the gap under a microscope, so the tissue keeps a blood supply in its new place.
Why the word "free"
Other flaps stay attached to the body by a stalk of tissue carrying their blood supply, so they can only reach nearby. A free flap is fully detached for a short time. That is what lets the surgeon take tissue from the thigh, forearm or leg and use it to rebuild the mouth, the jaw or the chest wall.
What it is used to rebuild
Free flaps are used most often after head and neck cancer surgery, for the tongue, floor of the mouth, jaw and throat. They are also used after some breast, limb and chest wall operations. The aim is not only to close the gap but to help you eat, swallow, speak or move again.
A free flap is one option among several. Whether it is right for you is a decision for your treating team, and this page cannot make it.What gets moved
What kinds of tissue can a free flap carry?
The surgeon picks the tissue that behaves most like what was removed. These are the common kinds.
Thin skin and fat
Soft, pliable tissue that can line the inside of the mouth or rebuild part of the tongue.
Often taken from
- The forearm
- The outer thigh
Bulkier skin and fat
Used where a larger space needs filling, such as after removing most of the tongue, or to rebuild a breast.
Often taken from
- The thigh
- The lower tummy
Bone with skin
Used to rebuild the jaw after part of it has been removed, so the face keeps its shape and dental work may be possible later.
Often taken from
- The lower leg
- The shoulder blade or hip
Muscle
Used to fill deep spaces or cover bone and metal, often with a skin graft laid over it.
A short piece of bowel can also be moved to rebuild the food pipe in the throat.Not sure whether this applies to you?
Ask an oncologistIn theatre
How is a free flap done, step by step?
The cancer is removed
The cancer surgeon removes the tumour with a margin, a rim of healthy tissue around it. Often a second team starts raising the flap at the same time.
The flap is raised
The tissue is carefully lifted with its artery and vein, traced back until they are long enough to reach. The donor site is then closed or grafted.
The vessels are joined
Under a microscope, the flap's artery and vein are stitched to vessels near the gap with stitches finer than a hair. This is the slowest, most careful part.
The flap is shaped and checked
Once blood is flowing, the flap is trimmed and stitched into the gap. The team checks its colour and blood flow before you leave theatre.
On your consent form
Which words will you hear about a free flap?
- Pedicle
- The artery and vein that feed the flap. It is the flap's lifeline.
- Anastomosis
- The join where two blood vessels are stitched together. A free flap needs at least one for the artery and one for the vein.
- Recipient vessels
- The blood vessels near the gap that the flap is connected to, often in the neck for head and neck surgery.
- Donor site
- The place the flap was taken from. It becomes a second wound that needs its own care.
- Perforator flap
- A flap fed by small vessels that pass through the muscle, so the muscle itself can be left behind.
- Flap monitoring
- Regular checks of the flap's colour, warmth and blood flow in the first days after surgery.
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Commonly believed
What do people often misunderstand about free flaps?
"It is like a transplant, so the body might reject
it."
The tissue is your own, so there is no rejection and no need for medicines to stop rejection. The real risk is different: the joined vessels can block, which is why the flap is watched so closely at first.
"The rebuilt part will work just like before."
A flap can restore a great deal, but it is not the original. A rebuilt tongue does not move the same way, and feeling is usually reduced. Speech and swallowing therapy often matter as much as the operation.
"Losing tissue from the leg or arm means losing its
use."
Donor sites are chosen because the body can manage without that tissue. Most people use the arm or leg normally once it has healed, though some notice stiffness, numbness or a visible scar.
"The long operation shows how serious the cancer
is."
The length comes mostly from the fine vessel work and having two operations in one. It does not tell you how advanced the cancer is. The pathology report does that.
Being straight with you
Who might a free flap not suit?
A free flap is a long operation under general anaesthesia, and it depends on healthy small blood vessels at both ends. So it may not suit everyone, even when the gap it would fill is large.
Health that makes it harder
Serious heart or lung disease can make a long anaesthetic unsafe. Poorly controlled diabetes, heavy smoking and blood vessel disease can damage the small vessels the flap relies on. Earlier radiation or surgery in the neck can leave fewer good vessels to connect to. None of these rules a free flap out on its own, but each one is weighed.
What the alternatives may be
Depending on the site, the choices may include a regional flap that stays attached nearby, a skin graft, a simpler closure, or a prosthesis, a custom-made artificial part. They may give less bulk or function but carry a shorter operation. Ask your team to explain the option below the one they suggest, and why they did not choose it.
Did you know
A bone free flap from the lower leg can be shaped with small cuts to follow the curve of a jaw, and fixed in place with a thin metal plate before its vessels are joined.
Questions we are asked
Common questions about free flaps
How long does a free flap operation take?
It usually takes many hours, often most of a day, because it combines removing the cancer, raising the flap and joining the vessels under a microscope. The exact time depends on the site and on how easily suitable vessels are found. Your surgeon can give you a rough idea for your own operation.
What happens if the flap fails?
If blood flow stops, the team often takes you back to theatre quickly to try to fix the join. When that does not work, the flap is removed and another way of closing the gap is planned. Ask your surgeon how often they see this and what the back-up would be.
Will I be in the ICU afterwards?
Many people spend the first night or longer in an intensive care or high dependency area, where nurses can check the flap often. Some centres use a specialist ward instead. After head and neck surgery, a temporary breathing tube in the neck is also common.
Will the flap have hair or feel different?
It carries the features of the place it came from, so skin from a hairy area may grow hair, even inside the mouth. Feeling is usually reduced, at least at first. Some return over time. Ask your surgeon what to expect from the donor site chosen for you.
Can I have radiation on a free flap?
Yes. Flaps usually cope with radiation better than grafts because they bring their own blood supply. Radiation can shrink and firm up a flap over time. The surgeon and radiation oncologist often plan the reconstruction with later radiation in mind.
Does smoking really matter before a free flap?
Yes. Smoking narrows small blood vessels and slows healing, both of which affect how well a flap takes. Your team will ask you to stop and will tell you how long before surgery that should be. Ask for help to stop; support is available.
Does CION do free flap surgery?
Call the helpline and ask about your specific operation. For any centre, ask how often their team does free flaps for your type of cancer, who monitors the flap overnight, and what happens if it needs to go back to theatre. Those answers tell you more than a general yes.
Is a free flap covered by Aarogyasri or insurance?
When it is part of cancer treatment, it is often covered, but rules differ. Aarogyasri, CGHS, ECHS, EHS and cashless insurers each set their own terms. Call the helpline with your card or policy details so your cover can be checked against the planned operation.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
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Sources
- National Cancer Institute — Head and Neck Cancers
- Cancer Research UK — Head and neck cancer
- Cancer.Net — What to Expect When Having Surgery
- Macmillan Cancer Support — Cancer information and support
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Microvascular Surgery and Why It Takes So LongWhere the hours in theatre actually goCommon Donor Sites and What They Cost YouWhat each donor site leaves behindFlap Monitoring in the First 72 HoursWhy the flap is checked so often after surgeryFlap Failure: Rates and What Happens NextWhat the team does if blood flow stops
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