Patients who have undergone liposuction at another clinic and are now troubled by contour irregularities or excessive depressions frequently come to our clinic. Fat grafting to fill those depressions is one option, but the most difficult part of revision fat grafting is not the injection technique itself — it is the choice of donor site: where to harvest the fat from. When a patient has already had fat suctioned from multiple areas, viable donor options are limited, and the remaining fat is often fibrotic and unsuitable for harvest. In this column, Dr. Moriwaki of AVAN TOKYO Ginza Liposuction Clinic explains donor site strategy for post-overcorrection revision cases from both anatomical and clinical perspectives.

Key Points of This Article

・In revision fat grafting, donor site selection influences the final result far more than injection technique itself

・After overcorrection, residual fat is fibrotic and shows a graft survival rate roughly 10–20% lower than normal

・Latissimus dorsi region, upper-outer buttock, and deep lower abdomen — areas rarely used in standard liposuction — must be strategically utilized

・The judgment “do not try to complete it in a single session” is especially important in revision

・To minimize the number of revision sessions, deliberately preserving harvest sites during the first revision is essential

The First Wall You Hit in Revision Fat Grafting

Most patients who present with overcorrection or severe irregularities have already had large volumes of fat suctioned from standard donor sites such as the thighs, abdomen, and upper arms. Even if we want to restore volume with fat grafting, we face a triple difficulty: the subcutaneous fat is too thin to secure the required volume, the residual fat is scarred and unusable as soft donor fat, and additional harvest risks creating new contour irregularities. This is exactly why revision fat grafting requires a completely different design philosophy from primary fat augmentation or first-time surgery. It is no exaggeration to say that the success of revision depends on “where and how much can be harvested” more than on injection technique.

Practical Priority Order for Donor Site Selection

In Dr. Moriwaki’s practice, revision fat grafting cases are evaluated in the following priority order.

1. Untouched Deep-Layer Fat

Deep abdominal fat (beneath Scarpa’s fascia) and the deep inner thigh are often preserved because many outside clinics suction only the superficial layer. Deep fat has relatively higher vascular density and tends to show more stable graft survival. Ultrasound assessment of residual fat thickness and quality before surgery is essential.

2. Back / Lumbosacral Transition / Latissimus Dorsi Region

The back is rarely used as a harvest site in cosmetic liposuction, making it a valuable donor for revision. In particular, the zone between the inferior scapular border and the iliac crest can yield a relatively substantial volume, with the added advantage that scars are inconspicuous. However, because fibrous content is high, careful harvest technique is required.

3. Upper-Outer Buttock

The upper-outer buttock allows small-volume harvests without compromising the hip line. Buttock fat has high fibrous content and tends to obstruct injection cannulas, so small-caliber harvest cannulas and filtration to remove coarse fibrous strands are necessary.

4. Accessory Breast / Axillary Line

The accessory breast area and axillary region often retain relatively soft fat and are seldom targeted by other clinics. In revisions where only a small volume is required (facial depressions, knee corrections), these sites can be highly useful.

Handling Fibrotic Residual Fat

Because residual fat after overcorrection is intermingled with scar tissue, it fragments more easily during harvest than normal adipocytes, shows a lower pure-fat yield after centrifugation, and demonstrates a graft survival rate roughly 10–20% lower than usual. Therefore, revision fat grafting requires planning injection volume based on a downward-adjusted “expected survival rate.” Rather than aiming for perfection in a single session, staged correction across 2–3 sessions ultimately minimizes the risk of recurrent irregularities. Explaining during consultation that “one session may not be enough” is grounded in this physiological reality.

Sequence Design and the Concept of “Preserving Harvest Sites”

When there is a high likelihood that 2–3 revision sessions will be needed, exhausting all donor sites in the first harvest leaves no fat available for future sessions. Dr. Moriwaki intentionally preserves 1–2 harvest sites during the first revision. This maintains flexibility for subsequent revisions and reduces the physical burden on the patient. For safety standards in cosmetic surgery and criteria for revision surgery, refer to information from the Japan Society of Aesthetic Surgery.

For Those Considering Revision Fat Grafting

Revision fat grafting is technically more demanding than primary surgery, and managing the patient’s own expectations is equally important. We fully understand the desire to “fix everything in one go,” but in revision, the safest and most reliable path is unhurried, staged progress. Bringing past operative records, information about techniques used, and pre- and post-operative photos to your consultation enables far more accurate donor planning. Because individual variation is large, please discuss thoroughly with your surgeon before proceeding.

See related columns on liposuction and revision surgery here

Frequently Asked Questions

Q. How many revision fat grafting sessions are typically needed?

Depending on the degree of irregularity and the amount of remaining donor fat, 2–3 staged sessions are common. Staged progress with evaluation between sessions produces a more stable final result than trying to complete correction in one procedure.

Q. Can fat be harvested again from an area that has already been suctioned?

It depends on the degree of fibrosis. We assess residual fat softness and thickness by palpation and ultrasound; if harvest is judged feasible, we use it — though survival rate will be lower than usual.

Q. What should I bring to a revision consultation?

If possible, please bring past operative records, information about the instruments and technique used, and pre- and post-operative photos. These are extremely helpful for donor site selection and injection volume planning.

Q. What is the graft survival rate for fat harvested in revision surgery?

Survival varies by site and degree of fibrosis, but tends to be about 10–20% lower than in primary surgery. We plan injection volume and number of sessions on this basis.

Q. How long should I wait after the first surgery before undergoing revision?

As a general guideline, revision is considered from 6 months postoperatively, once scar tissue has matured. However, in cases of severe deformity or impaired daily function, timing is decided individually in consultation with the surgeon.

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Medical Supervision: Shin Moriwaki, M.D. (Supervising Physician)

Member, Japan Society of Aesthetic Surgery (JSAS) / Member, American Academy of Aesthetic Medicine

ECFMG Certificate (U.S. Medical Licensing Qualification)

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