Soft Tissue · Procedure
Fat transfer has always been described by its quantity — how many hundred millilitres were moved. The number is the least interesting part of it. What decides both the result and the safety of the operation is a single question: which layer did the fat go into?
For most of the history of this procedure that question was answered by feel. The surgeon judged depth from the resistance of the tissue against the cannula and from a hand placed on the skin. UGRAFT answers it by looking. An ultrasound probe rests on the skin throughout, the cannula appears on the screen as a bright line, and the plane it is travelling in is confirmed on every pass rather than inferred.
UGRAFT is a fat transfer technique in which an ultrasound probe images the cannula throughout the operation, so the layer the graft is placed into is confirmed on every pass rather than judged by feel. Developed by Dr. Maurício Viaro.
Two entirely different technologies on this site share the word ultrasound, and confusing them is easy.
VASER uses ultrasound as energy — it emulsifies fat so that it can be aspirated under control. UGRAFT uses ultrasound as imaging — it produces a live picture of the layer a cannula is in. One releases tissue; the other looks at it. They are not alternatives, they are frequently used in the same operation, and the fees for each are separate.
Origin
UGRAFT® is a named technique, developed by Dr. Maurício Viaro, and it is registered as such. Dr. Higuchi did not devise it. He is a member of the UGRAFT® Technique group and trained in it directly with Dr. Viaro and his faculty at the First International Course in Cairo, Egypt, in 2026.
We say this plainly for the same reason we say it about RIBXCAR. Ultrasound-guided fat transfer is performed by a limited number of surgeons, technique is not standardised between countries, and the most useful question you can ask any surgeon offering it is where they were trained in it, and by whom. Here the answer is: by the surgeon who developed it.
The acronym itself comes from the published description of the method — ultrasound-guided fat transfer, first set out in the plastic surgery literature as a way of placing graft into the rectus abdominis under direct imaging, and since extended to the other sites described on this page.
Principle
Subcutaneous fat is not one thing. It is layered — a superficial compartment, a fascial sheet, a deep compartment — and beneath all of it lies the muscular fascia, then muscle, then the vessels that run within it. Injected fat behaves completely differently depending on which of those it is placed in. Too superficial and it shows as a visible irregularity or a palpable nodule. Too deep and it is at best wasted; at worst it is dangerous.
Placing a graft accurately therefore has nothing to do with force and everything to do with knowing, at each moment, where the tip of the cannula is. The difficulty is that the cannula is invisible. Once it has entered the tissue the surgeon has only two sources of information: the resistance transmitted up the instrument, and a hand on the skin.
Both are real skills, and both are inferences. Ultrasound replaces the inference with an image. The tissue layers appear as distinct bands, the fascia as a bright line, the cannula as a moving echo within them. The depth of every pass becomes something observed rather than something believed.
Safety
It would be dishonest to present ultrasound guidance as a refinement of technique without saying what drove its adoption. Gluteal fat grafting has carried a higher mortality rate than any other aesthetic surgical procedure. The mechanism is specific and well described: fat injected into or beneath the gluteal muscle can enter a torn vein, travel to the lungs, and cause a pulmonary fat embolism.
In 2017 the Aesthetic Surgery Education and Research Foundation convened a task force on it. Surveying 692 surgeons and 198,857 cases, it recorded 32 deaths from pulmonary fat emboli and found that surgeons who injected into the deep muscle had a significantly higher rate of both fatal and non-fatal events.[1] The recommendations that followed were blunt: stay in the subcutaneous plane, use a cannula of at least 4 mm, do not angle the cannula downwards.
They worked. A repeat survey two years later found the incidence of pulmonary fat embolism had fallen from 1 in 1,030 to 1 in 2,492, the mortality trend from 1 in 3,448 to 1 in 14,952, and the proportion of surgeons injecting into deep muscle from 13.1 per cent to 0.8 per cent.[2]
Everyone now agrees the fat must stay above the muscular fascia. The remaining question is how a surgeon knows that it did.
Intending to stay in a plane and confirming that you did are not the same act. Ultrasound guidance is the answer to the second question, not the first — and it is the only one of the two that produces evidence at the time.
What the imaging changes in practice: the depth of the subcutaneous compartment is measured before anything is injected rather than estimated; the fascia is identified as a landmark to work above; the cannula is tracked continuously rather than checked intermittently; and in the buttock, colour Doppler shows the perforating vessels themselves. One series of 177 Doppler-guided cases recorded a median of nine perforating arteries per buttock, distributed differently in every patient — a map that cannot be memorised from a textbook because it is not the same twice.[5]
Evidence
The results are consistent in direction. A systematic review and meta-analysis of 38 studies covering 22,151 patients found major complications in 0.02 per cent of ultrasound-guided cases against 0.08 per cent without it, minor complications in 2.82 against 3.70 per cent, and the lowest rates of all where injection was confined to the subcutaneous plane.[4] A single-centre retrospective series of 1,815 ultrasound-guided gluteal cases reported no macroscopic fat emboli and no deaths, with an overall complication rate of 4 per cent — seroma 1.2 per cent, localised skin ischaemia 1.2 per cent, surgical site infection 0.8 per cent.[3]
A scoping review published in 2026 assessed all nine studies of ultrasound-guided gluteal fat grafting available to March 2025 and concluded that the evidence consists predominantly of observational case series, with no randomised or high-quality comparative studies.[6] No fat embolism or procedure-related death was reported in any of them, but the review was explicit that the benefit remains to be established comparatively.
Our reading of that is straightforward. The direction of the evidence is consistent, the mechanism is understood, the cost of the precaution is low and the consequence of the error is death. That is enough to make it our standard practice; it is not enough to let anyone call it proven. A page that told you otherwise would be selling something.
Beyond safety
Safety is why ultrasound guidance was adopted. It is not the only thing it does, and for grafting outside the buttock it is often not the main thing.
Application
Buttock and hip
The highest-risk site, and the one the safety literature is written about. Fat is placed strictly in the subcutaneous compartment above the gluteal fascia, with Doppler used to identify perforating vessels first. Often planned together with harvest from the waist and back, so the contrast between waist and hip is created from both directions at once.
The hourglass silhouette →Breast
Fat transfer augmentation using condensed graft, alone or layered over an implant to soften an edge that would otherwise be visible in thin tissue. Where an implant is present, knowing exactly where the capsule lies is not a refinement but a requirement.
Why natural is the hardest result →Chest and limbs
Grafting that adds dimension where removal alone would only make an area smaller. The targets here are shallow and the margin for a visible irregularity is correspondingly narrow, which is the argument for imaging in a site that carries no embolic risk at all.
Contour repair
Smaller-volume work, frequently addressing a hollow or a step left by ageing, weight change or previous surgery. Adding volume is sometimes the correct answer to a contour problem that presents itself as an excess.
Grafting is almost never the whole plan. The donor site is part of the design, which means the liposuction that harvests the graft is planned as carefully as the placement.
Candidacy
Where an implant, a lift, or simply doing nothing would serve you better than a graft, that is what you will be told at consultation — before you commit to travel.
The Operation
Recovery
A graft has no blood supply of its own for the first days. It acquires one from the tissue around it, and sustained compression of that tissue interferes with the process — which is why the restrictions on sitting after gluteal grafting are not a comfort measure.
For a patient flying home this is a practical planning matter, not an abstraction. A long-haul flight is several hours of exactly the pressure you have been told to avoid. It is worth raising at consultation rather than discovering at the airport.
Fees
In Japanese yen, including consumption tax. Breast and gluteal augmentation are quoted whole and include the liposuction needed to harvest the graft from the stated number of donor areas. Grafting to other body areas is charged per recipient area, with harvesting, processing and the donor-site liposuction charged separately.
| Procedure | Fee (JPY, incl. tax) |
|---|---|
| Breast | |
| Fat transfer augmentation, Condense Rich (2 donor areas) | ¥1,320,000 |
| Fat transfer augmentation, second session | ¥990,000 |
| Hybrid augmentation (fat transfer with implant) | ¥1,650,000 |
| Fat transfer with implant removal | ¥1,540,000 |
| Buttock | |
| Gluteal fat transfer (2 donor areas) | ¥1,265,000 |
| Body fat grafting — per recipient area | |
| Fat harvesting and processing (Condense Rich) | ¥220,000 |
| Pectoralis | ¥770,000 |
| Décolletage | ¥660,000 |
| Quadriceps | ¥660,000 |
| Banana roll | ¥550,000 |
| Deltoid | ¥440,000 |
| Biceps | ¥440,000 |
| Triceps | ¥440,000 |
| Rectus abdominis | ¥330,000 |
| Additional | |
| General anaesthesia | ¥165,000 |
| Standard set (anaesthetic, medication, compression garment) | ¥66,000 |
| Blood tests | ¥11,000 |
Body fat grafting requires a separate liposuction fee to harvest the graft; liposuction is charged by donor area from ¥275,000 and is set out in full on the liposuction page. A surcharge applies by body mass index: ¥55,000 for BMI 25–30, and ¥110,000 for BMI 30 and above. All figures are standard prices, not monitor prices. See the full fee schedule and process for international patients.
Guarantee
Condense Rich fat transfer breast augmentation carries a one-year guarantee, alongside VASER liposuction, VASER 4D and gynecomastia surgery. It includes re-examination by your operating surgeon at no consultation charge, post-operative treatment such as management of pain, swelling and wound care, and — from six months after surgery, at the operating surgeon’s discretion — design adjustment. Medication and anaesthesia may be charged separately.
Fat grafting to the body, including gluteal fat transfer, is not covered. Nor is a second session priced as a continuation of the first, except for the breast, where the second-session fee above applies. We set this out here rather than in the small print because for a patient travelling from abroad it changes the calculation.
Being outside Japan does not void the guarantee where it applies, but making use of it means returning to Japan. Please plan on that basis rather than assuming otherwise.
Risks
This is elective surgery, it is not covered by health insurance in Japan, and its outcome cannot be guaranteed. Ultrasound guidance reduces the probability of the most serious complication below; it does not eliminate it, and it does not eliminate any of the others.
Questions
It is fat transfer performed while an ultrasound probe on the skin shows the tissue underneath in real time. The cannula appears on the screen as a bright line, so the layer it is travelling in is seen rather than inferred. Nothing about the fat itself changes. What changes is that the depth of every pass is confirmed visually instead of judged by feel. UGRAFT® is a named technique developed by Dr. Maurício Viaro; Dr. Higuchi is a member of the UGRAFT® Technique group and trained in it directly with its faculty in Cairo.
No. Both involve ultrasound, and that is where the similarity ends. VASER uses ultrasound as energy, to emulsify fat before it is aspirated. UGRAFT uses ultrasound as imaging, to see the plane a cannula is in. One is a way of releasing tissue; the other is a way of looking. They are frequently used in the same operation and answer entirely different questions.
Because of where the large veins are. In the buttock, fat injected into or beneath the gluteal muscle can enter a torn vein and travel to the lungs as a fat embolus. The 2017 ASERF task force found that surgeons who injected into deep muscle had a significantly higher rate of fatal and non-fatal pulmonary fat embolism, and gluteal fat grafting has carried a higher mortality rate than any other aesthetic operation. Staying above the muscular fascia is the single most important safety decision in the procedure, and imaging is how that decision is verified rather than assumed.
Consistent, but not yet definitive, and we would rather say so plainly. A 2025 meta-analysis of 38 studies and 22,151 patients found lower major complication rates with ultrasound guidance, 0.02 per cent against 0.08 per cent, and the lowest rates overall with subcutaneous-only injection. A series of 1,815 ultrasound-guided cases reported no macroscopic fat emboli and no deaths. However, a 2026 scoping review concluded that the published evidence consists mainly of observational series with no randomised or high-quality comparative trials. The direction of the data is clear; the certainty a randomised trial would give does not exist yet.
Not all of it, and no honest surgeon will tell you a fixed figure. A proportion of every graft is resorbed over the first months, the amount varying with the recipient site, how thinly the fat was distributed, blood supply, and how much pressure the area is subjected to while it is establishing itself. This is why volume is judged at around six months rather than at six weeks, why over-correction at the first session is not a solution, and why a second session is sometimes planned from the outset rather than treated as a failure.
Yes, and this is the most common reason a plan changes at consultation. The graft has to be harvested from somewhere, and a very lean patient may not have enough donor fat to achieve the volume they have in mind. That is not always bad news, because the harvest itself contributes to the result. Taking fat from the waist and back to place it in the hip changes the silhouette twice over. But where donor volume genuinely is not there, we say so rather than promising a result the anatomy cannot supply.
The buttocks and hips, the breast as Condense Rich fat transfer augmentation or as part of a hybrid with an implant, the pectoralis, the deltoid, biceps and triceps, the décolletage, the banana roll beneath the buttock, the rectus abdominis and the quadriceps. In practice most of these are planned alongside liposuction rather than on their own, because the donor site is part of the design.
Plan for at least two weeks after surgery. That covers early recovery, compression of the donor areas and at least one in-person follow-up before you are cleared to fly. Where grafting is combined with liposuction across several areas, or with skeletal work, the stay is set by the larger operation rather than by the grafting.
Fat transfer breast augmentation with Condense Rich is ¥1,320,000 including two donor areas, and gluteal fat transfer is ¥1,265,000 including two donor areas. Grafting to other body areas is charged per recipient area, from ¥330,000, with a separate fee of ¥220,000 for harvesting and processing and a separate liposuction fee for the donor sites. General anaesthesia, the standard post-operative set and blood tests are additional, and a surcharge applies by body mass index.
Not freely, and not immediately, where the buttock has been grafted. Sustained pressure on fat that has not yet established a blood supply reduces how much of it survives and can distort the shape it was placed in. You will be given specific instructions on sitting, sleeping position and the use of a cushion, and the period they apply for. For a patient who has to take a long flight home, this is worth planning for before you book the ticket rather than after.
Partly. Condense Rich fat transfer breast augmentation is covered, alongside VASER liposuction, VASER 4D and gynecomastia surgery. Fat grafting to the body, including gluteal fat transfer, is not covered. We would rather tell you that here than let you assume otherwise.
References
Retrieved from PubMed. The figures quoted on this page are taken from the following peer-reviewed sources; the conclusions each of them draws are their authors’, not ours.
Next
Grafting is planned from two things at once — where volume is wanted, and where it can be taken from without cost to the rest of the silhouette. The consultation is held online, in English, before you commit to any travel. Photographs are more useful than descriptions.