Autologous Fat Grafting (Microfat & Nanofat)

Overview

Autologous facial fat grafting is the surgical transfer of a patient's own adipose tissue — harvested from donor sites such as the abdomen, flanks, or thighs — to facial compartments that have lost volume through aging, weight loss, or disease. Because the transplanted material is the patient's own tissue, it carries no risk of allergic response, and when sufficient graft survival occurs, the results are anatomically integrated and permanent.

The technique encompasses two distinct methodologies with different anatomical targets: microfat grafting, which restores structural volume in deep facial compartments, and nanofat injection, which delivers a stem-cell-rich cellular fraction to improve dermal thickness, skin quality, and texture. Contemporary surgical practice often employs both techniques in the same operative session, addressing structural and cutaneous deficits simultaneously.

The Anatomy: How Facial Volume Loss Produces Aging

The youthful face is characterised by convex fullness at the malar eminence, well-defined orbital rims, a smooth transition from cheek to lower eyelid, and a convex lateral cheek profile. These contours are maintained by discrete subcutaneous fat compartments — the medial cheek, buccal, nasolabial, lateral cheek, orbital, and temporal fat compartments — which maintain their volume and anatomical position throughout early adulthood.

With advancing age, these compartments atrophy independently and at different rates. The medial and deep medial cheek fat pads deflate earliest, producing the characteristic hollow beneath the infraorbital rim. Buccal fat atrophy produces skeletonisation of the midface. Temporal hollowing gives the upper face a gaunt appearance. GLP-1 agonist therapies (semaglutide, tirzepatide) have produced a secondary epidemic of premature facial volume loss in otherwise healthy patients — a condition now commonly referred to as "Ozempic face" — by accelerating the same compartmental atrophy that aging produces over decades.

Fat grafting to specific depleted compartments is the anatomically correct intervention: it restores the precise tissue type lost, in the precise location depleted, with permanence that no synthetic filler can replicate.

Microfat vs Nanofat: Technical Distinctions

Microfat

Microfat is harvested through small-gauge blunt-tip cannulas using a low-pressure syringe technique that preserves intact adipocyte viability. The harvested fat is processed by centrifugation at 1200–3000 rpm to separate the layered components: oil (damaged adipocytes) supernatant, viable fat middle layer, and aqueous/blood infranatant. The concentrated viable fat layer is injected into deep facial compartments through blunt microcannulas in retrograde linear threads, distributing small volumes (0.1–0.3 mL per pass) across multiple tissue planes to maximise contact surface area with the recipient vasculature.

Nanofat

Nanofat is produced by taking centrifuged microfat and passing it repeatedly through interconnected syringes of progressively smaller calibre — typically 2.4 mm, then 1.4 mm — until the intact adipocytes are mechanically disrupted. The resulting emulsion is further filtered through a fine gauze. The product retains the stromal vascular fraction (SVF), including adipose-derived stem cells (ADSCs), endothelial progenitor cells, and growth factor-rich extracellular matrix, but contains no viable intact fat cells. Nanofat is injected superficially — into the dermis and subdermal plane — using fine-gauge needles. It does not provide structural volume but triggers cellular regeneration, new collagen synthesis, and measurable improvement in skin quality.

Ideal Candidate Profile

• Facial volume loss attributable to aging, GLP-1-mediated weight loss, or illness
• Adequate donor site fat — typically minimum 50–100 mL harvestable volume
• Stable body weight for 6+ months prior to procedure (weight fluctuation alters graft survival and final result)
• Skin quality concerns suitable for nanofat (periorbital crepe skin, under-eye hollowing, fine rhytids over the lateral cheek)
• Dissatisfaction with synthetic filler results — poor longevity, migration concerns, or desire for a permanent structural solution

The Surgical Protocol

Fat grafting to the face is performed under local anaesthesia with tumescent technique for isolated cases, or under general anaesthesia when combined with other facial surgical procedures (facelift, blepharoplasty). Operative time for isolated fat grafting is typically 2–3 hours.

Donor Site Harvesting

Tumescent solution (saline with dilute adrenaline and local anaesthetic) is infiltrated into the donor site to minimise bleeding and allow atraumatic harvest. Fat is aspirated through 2–3 mm blunt-tip cannulas using gentle manual syringe pressure. Common donor sites are the periumbilical abdomen, inner knee, and medial thigh. The volume harvested exceeds the planned injection volume by 30–40% to account for processing losses.

Processing and Preparation

Harvested fat is processed according to the planned application: centrifugation for microfat structural grafting; mechanical emulsification and filtration for nanofat preparation. Processing is performed in a closed sterile system throughout to minimise contamination risk.

Injection

Microfat is injected via blunt cannulas into deep compartments — subperiosteal, supraperiosteal, and deep fat compartment planes — building structure from the deepest plane outward. Volume per compartment is calibrated against the pre-operative assessment of deficit. Nanofat is delivered separately via fine-gauge needles into the dermis and subdermal plane of areas with skin quality concerns.

Recovery Timeline

• Days 1–3: Moderate bruising and oedema at facial recipient sites; lesser bruising at donor sites. Significant overcorrection is visually apparent and intentional.
• Days 7–14: Bruising resolves. Residual oedema persists, masking the final result.
• Month 1–3: Swelling substantially resolves. Grafted volume appears to reduce as oedema clears — this is expected and does not represent full fat resorption.
• Months 6–12: Stable graft retention established. Final results are assessed at 12 months post-procedure. Retained fat at this point is permanent.

Cost in the United States

Isolated facial fat grafting procedures typically range from $5,000–$12,000. When performed in combination with a facelift or blepharoplasty, the incremental cost for fat grafting is typically $2,000–$5,000 above the primary procedure fee. Cost components include surgeon's fee, anaesthesia, and facility.

Risks and Contraindications

• Fat resorption: 30–60% of grafted volume typically resorbs within the first 6–12 months. The degree of resorption is influenced by technique, graft viability at injection, recipient site vascularity, and metabolic factors.
• Overcorrection: Planned overcorrection can produce temporary or, in cases of higher-than-expected survival, persistent volume excess — particularly in the periorbital region, where overcorrection is visually obvious.
• Cyst formation: Oil cysts can form at graft sites when necrotic adipocytes liquefy and encapsulate. Most resolve spontaneously; larger cysts may require aspiration.
• Vascular occlusion (rare): At periorbital and nasal sites, inadvertent intravascular injection of fat can cause embolism. This risk is mitigated by blunt cannula technique, low injection pressure, and continuous cannula movement.