Free Flap Reconstruction

Free consultation

Tell us about the vessels, not only the defect

Whether this operation is possible depends on the plumbing at both ends, which means the vessels at the defect and the vessels wherever the tissue will come from. Send the imaging of the affected area, any previous operation notes covering that region, a note of any radiotherapy given to it, and details of smoking, diabetes, blood pressure and any circulation problem in the arms or legs. Add any angiogram or duplex you already have. What comes back is an opinion on whether a free flap is the right answer, which donor site your own anatomy supports, and what the first seventy-two hours will involve. The review costs nothing and carries no obligation.

What makes a flap free

Free here has nothing to do with cost and everything to do with detachment, and a flap is any piece of living tissue moved while its blood supply stays intact. Most flaps stay attached at one edge and swing into position like a door on a hinge, which limits how far they travel and keeps them tethered to where they started. A free flap is cut loose entirely, artery and vein divided, and carried to a site that may be on the other side of the body.

Detachment buys the freedom. Detachment also creates the entire risk.

This table scrolls sideways on a narrow screen. Swipe or drag to see every column.

Perforator flaps changed the field. Instead of taking a whole muscle to carry the blood vessels, the surgeon traces individual vessels the width of a pencil lead as they pierce through the muscle, dissects them out and takes only skin and fat, leaving the muscle where it was and still working. Modern abdominal breast reconstruction therefore leaves the abdominal muscles in place, and why donor sites recover far better than they did a generation ago.

The clock that starts

From the moment the artery is divided, the tissue in the surgeon's hands has no blood going into it and none coming out. The tissue is alive on borrowed time. Skin and fat tolerate this reasonably well for a couple of hours. Muscle tolerates it considerably worse, which is one of the quieter arguments for perforator flaps over muscle-carrying ones. Everything the team does between dividing the vessels and releasing the clamps is shaped by keeping that interval short, and it is why the tissue is shaped and positioned before the join rather than after it, and why the two surgical teams work simultaneously wherever the anatomy allows. None of this is visible from outside the theatre, and all of it is the difference between a flap that survives comfortably and one that spends its first night struggling. Ask how long your operation is expected to take. A team that has thought about the answer will give you a range rather than a shrug.

When the clamps come off, the flap changes colour within seconds. Watching it happen counts as the first verdict, and it is a good one to be present for.

None of which ends anything. Blood flowing at the end of the operation says the join is open now, and says nothing about whether it will still be open at four in the morning, which is the question the rest of this page is about.

The join

Two vessels get sewn together, each about the width of the lead in a pencil, using thread finer than a human hair and viewed through an operating microscope. Everything else in this operation is preparation for that.

Twenty-five minutes saved on a single join sounds like a convenience. It is also twenty-five minutes less that the tissue spends without blood, which is the reason the difference in outcomes exists at all.

Seventy-two hours of watching

Almost everything that will go wrong with a free flap goes wrong in the first three days, and almost all of it is fixable if somebody notices in time. Those two facts together explain why the monitoring runs as relentlessly as it does. Somebody comes every hour, and for the first day or two that includes every hour of the night. What they are doing looks unglamorous and remains the best test available. They look at the colour. They press the skin and count how long it takes to pink up again. They feel the temperature. Where a paddle of skin is visible they prick it with a needle and watch both what colour of blood appears and how quickly it comes, because bright red after a couple of seconds is a healthy flap while dark blood appearing instantly is a congested one, and no machine yet built reads that distinction as reliably as a nurse who has seen it before.

Machines assist and have not replaced this, and the simplest of them is a handheld probe that finds the pulse in the flap. An implantable probe can be wrapped around the vessel itself and left in place to give a continuous signal, and there has been an argument for years about whether it belongs on the artery or the vein.

Fewer false alarms matters, because a false alarm at three in the morning means an unnecessary trip to theatre. Nobody should be told that a particular probe placement will save their flap.

Your part in all of this is small and it is not nothing, so stay warm, stay hydrated, keep the flap free of pressure, and mention immediately if the area feels different, because patients occasionally notice a change before the chart does.

When it goes wrong

Two things can block, and they look completely different.

Arterial blockage starves the flap, which goes pale, cool and slack, refill after pressing becomes sluggish, and a needle prick produces very little. Venous blockage happens more often and looks far more dramatic. Blood arrives and cannot leave, so the flap turns purple, swells, feels tense, refills instantly and bleeds dark blood the moment it is pricked. Either finding sends you back to theatre, and speed is the whole game. The clot is removed, the join is redone or a different vessel is found altogether, and flaps re-explored quickly do considerably better than flaps re-explored late, which is the entire reason for the hourly checks and the reason nobody waits until morning to see whether it settles. Return to theatre after a free flap is not a sign that something was done badly. The system is working as designed, and knowing that beforehand takes most of the fear out of somebody wheeling you off the ward at midnight. Raise it before the operation, while it is still an abstraction, rather than in the moment.

Where congestion persists and no surgical fix is possible, one very old treatment remains genuinely useful and horrifies almost everybody who is offered it.

Both halves of that finding deserve stating, because a leech secretes a powerful anticoagulant while it feeds and keeps the wound bleeding for hours afterwards, which drains a congested flap long enough for new small vessels to grow in. Three flaps in four were saved. Four patients in five had a complication, most often needing antibiotics or a transfusion, and anybody presenting leech therapy as a quaint curiosity without mentioning that second figure is not describing the treatment honestly.

Which flap, from where

Around a dozen donor sites cover the great majority of what is done, and the choice follows from what the defect needs rather than from surgeon preference.

This table scrolls sideways on a narrow screen. Swipe or drag to see every column.

Your own anatomy overrules that table, since imaging of the intended donor area before surgery shows the vessels feeding it, and in a meaningful minority of people those vessels are absent, too small or arranged unhelpfully, which is far better discovered on a scan than on the operating table.

Who it works in

Age on its own rules nobody out. Free flaps are performed successfully in people in their eighties, and fitness for a long anaesthetic matters far more than the number in the notes. What genuinely lowers the odds is anything that damages small blood vessels or the healing that follows. Smoking sits at the top of that list and is the one thing a patient can still change, since nicotine constricts precisely the vessels this operation depends on, and stopping four to six weeks beforehand is long enough to matter. Poorly controlled diabetes, established peripheral arterial disease, previous radiotherapy to the recipient area and a clotting disorder all raise the risk in ways that get weighed rather than automatically excluding anybody, and a surgeon who declines to operate on those grounds should be able to tell you which specific factor decided it. Take a vague refusal to somebody else. A specific one rarely needs a second opinion, because a surgeon who can name the vessel or the disease that stopped them has already done the work.

Questions that are fair to ask

How many free flaps does this unit perform in a year. Who monitors the flap overnight, and how often. Is there a surgeon able to take me back to theatre at three in the morning, present in the hospital rather than on call from home. What is the plan if this flap fails.

Any unit that answers those four without hesitating is telling you most of what you need to know.

The ward routine

Ward routine has changed in two ways over the last decade, and both will be done to you, so they are worth a paragraph each.

Getting up sooner

Patients used to be kept flat, still and nil by mouth for days on the theory that movement threatened the join, until structured recovery protocols replaced it with early feeding, early sitting, early walking and less sedation, and the results have been measured.

Hanging the leg down

Where the flap is on a lower limb, it spends the first days elevated, and it cannot stay that way forever because you eventually have to stand up. The transition is managed with a dangle protocol, lowering the leg for a few minutes at a time and building up gradually so that the new circulation learns to cope with gravity without the flap becoming congested.

Which fairly summarises where the evidence sits, in that starting earlier appears to get people home sooner without measurably harming the flap, and the numbers involved are small enough that reasonable units still do it differently.

Recovery and the donor site

You have two wounds healing on two different timetables, and the one people ask least about is frequently the one that irritates them longest.

1. The flap itself is numb, will stay numb for months, and may never regain full sensation. It also has no sweat glands working normally at first, which patients notice in warm weather.
2. Swelling in the flap peaks in the first fortnight and continues settling for three months, so its final shape cannot be judged before then.
3. The donor site sets the pace for walking, lifting and driving. A leg donor site needs a fortnight before it walks confidently, an abdominal one restricts lifting for six weeks, a forearm one needs a splint and hand therapy.
4. A refinement operation to thin, reshape or revise the flap is planned rather than exceptional, and usually happens three to six months later.
5. Scars at both sites redden and thicken between six weeks and three months before fading across the following year.

Nobody should be judging the appearance of any of this at six weeks.

One warning saves a good deal of distress, which is that a flap taken from the abdomen or thigh keeps the behaviour of the tissue it came from, which means it gains and loses weight with the rest of you. Substantial weight change after reconstruction alters the result, and that is worth knowing before rather than after.

How long you stay

Allow two and a half to four weeks in the country, and the range depends far more on the donor site than on the flap. An upper body reconstruction sits at the shorter end. A lower limb flap sits at the longer one, because the leg has to be taught to hang down again before you can walk to a departure gate. Assessment takes three to five days. Imaging of the donor vessels, which is the investigation most likely to change the plan, assessment of the recipient area including any previous radiotherapy, anaesthetic review, bloods and photographs, and a joint discussion between the reconstructive team and whoever is performing the resection where that is happening at the same operation. Very little of that week compresses, and the imaging in particular cannot be skipped in the interest of an earlier operating date, since the whole point of it is to find the problem that would otherwise be found halfway through the operation with the tissue already raised.

Hospital stay runs seven to fourteen days, with the first two or three in a high dependency setting where the hourly checks happen, followed by one to two weeks nearby for wound review, the removal of drains and sutures, mobilisation and the first work on the donor site. Those two weeks are not padding, and skipping it is the single commonest way an otherwise successful reconstruction turns into a problem managed by strangers.

When you are cleared to fly

Around three weeks. That clearance depends on wounds being dry, drains being out, the flap having been stable for a full week and the donor site allowing you to move about the cabin, and compression stockings and regular walking matter here more than after most operations, since a long procedure and a long flight are each a clotting risk and the two of them stack.

What drives the cost

Most of what makes this expensive happens outside the operating theatre, which is the opposite of what patients assume, and seven things move the figure.

1. Theatre time, which for a free flap runs to most of a working day.
2. High dependency nights, driven by the hourly monitoring rather than by how ill you are.
3. The nursing establishment those hourly checks require, which is the single least visible item on any quotation.
4. Consumables including coupler devices, microsurgical instruments and any implanted monitoring probe.
5. Preoperative vessel imaging, and computer planning with printed guides where bone is being rebuilt.
6. The provision for an unplanned return to theatre, which is a real event rather than a clause.
7. The refinement operation that follows months later, which quotations routinely leave out.

Packages here ordinarily cover the transfers, the assessment, the operating fees, the stated hospital and high dependency nights, an interpreter, accommodation and the appointments before you fly. Outside them sit the flights, insurance, extra nights, later stages, garments and therapy, and the treatment of a complication.

Six questions to ask before you accept a figure

How many high dependency nights are included and what an extra one costs. Who pays if the flap has to be re-explored. What happens financially if the flap fails and a second one is needed. Is the donor vessel imaging inside the figure. Is a coupler or implanted probe itemised separately. And is the refinement stage quoted, or assumed to be somebody else's problem.

The second and third of those are the ones that separate serious quotations from optimistic ones.

Nothing here means anything until a microsurgeon has seen your imaging. That review is free, and it will tell you inside a week whether this operation is the right one for your defect and your vessels, which is more than any published figure can do.

Once you are home

By the time you fly, the dangerous window has closed. Follow-up from then on is about healing and shape rather than survival of the flap, with review at roughly six weeks, three months and a year, and the conversation about the refinement stage happening at the second of those appointments rather than the first.

Four documents travel with you, in English. Whoever sees you next was not in the theatre and will be working entirely from what you hand them.

• The operative note, naming the flap, the donor and recipient vessels, and how the vein was joined.
• A record of whether the flap needed re-exploration, since that changes how any future problem is interpreted.
• The donor site instructions, with the rehabilitation timetable and any weight or lifting restriction.
• Photographs taken before discharge, which is the only reliable baseline anybody will have later.

Report a flap that darkens, swells or feels tense, a wound that opens, spreading redness or fever, and any sudden increase in pain at either site. Send a photograph in daylight rather than describing the colour, because colour described over a message is close to useless and a picture answers the question in seconds, at any hour, from anywhere. Take it in daylight. Take it from the same angle each time, so that two photographs a day apart can actually be compared rather than argued about. Long term, this tissue is yours and behaves like it. It ages with you, tans with you, and if it came from your abdomen it will still know it came from your abdomen twenty years from now. Therein lies the strength of the operation, and the reason a procedure carrying three days of hourly observation has outlasted every simpler alternative proposed to replace it.

Frequently asked questions about free flap reconstruction