Fat Transfer — Principles, Procedures, and Recovery

Last updated: 5 March 2026

Fat transfer — also known as autologous fat grafting, lipofilling, or fat injection — is one of the most elegant concepts in aesthetic medicine: using your own fat tissue to restore volume, contour the face or body, and improve skin quality. First described in the late 19th century but refined into a reliable technique only in recent decades, fat transfer has become a cornerstone of modern plastic surgery and an increasingly popular alternative to synthetic fillers. This comprehensive guide explores the science, techniques, and practical considerations of fat transfer procedures in the United Kingdom.

The Science Behind Fat Transfer

Fat transfer involves three distinct stages: harvesting fat from a donor site, processing and purifying the harvested fat, and re-injecting the processed fat into the recipient site. The success of fat grafting depends on the viability of the transferred adipocytes (fat cells) and their ability to establish a new blood supply (neovascularisation) at the recipient site.

Why Fat Is Special

Fat tissue is far more than simple insulation. Adipose tissue is now recognised as a richly vascularised endocrine organ containing multiple cell types including mature adipocytes, adipose-derived stem cells (ADSCs), pericytes, endothelial cells, and immune cells. The ADSCs within transferred fat are particularly valuable — they can differentiate into multiple cell types, secrete growth factors that promote healing and rejuvenation, and have been shown to improve skin quality in the overlying tissue through paracrine signalling.

This regenerative component sets fat transfer apart from synthetic fillers. Whilst HA fillers provide volume alone, fat transfer provides volume, structural support, and a regenerative boost to the surrounding tissues.

Harvesting Techniques

Fat is harvested from donor sites with adequate fat stores — most commonly the abdomen, flanks (“love handles”), inner thighs, or outer thighs. The harvesting technique significantly impacts fat cell viability and therefore the success of the graft.

Tumescent Technique

The donor site is first infiltrated with tumescent fluid — a dilute solution of local anaesthetic (lidocaine) and adrenaline in saline. This provides anaesthesia, reduces bleeding, and facilitates fat extraction. After adequate infiltration time, fat is harvested using a cannula connected to a syringe (manual aspiration) or low-pressure liposuction device.

Manual vs. Machine Aspiration

Manual (syringe-based) aspiration using the Coleman technique is considered the gold standard for fat grafting, as it applies lower negative pressures that preserve fat cell integrity. Machine-assisted liposuction can also be used but requires careful pressure management to avoid excessive adipocyte damage. Power-assisted liposuction (PAL) at reduced settings offers a compromise between efficiency and cell preservation.

Application	Volume Needed	Fat Survival Rate	Sessions	Recovery	UK Cost
Facial rejuvenation	20-60ml	40-70%	1-2	1-2 weeks	£3,000-£6,000
Hand rejuvenation	5-15ml per hand	40-60%	1-2	1-2 weeks	£2,000-£4,000
Breast augmentation	200-400ml per breast	50-70%	1-3	2-4 weeks	£5,000-£9,000
Buttock augmentation (BBL)	300-800ml per side	50-70%	1-2	4-6 weeks	£5,000-£10,000
Scar revision	5-20ml	Variable	1-3	1-2 weeks	£2,000-£4,000

Processing and Purification

Harvested fat must be processed to remove non-viable components before injection. Several techniques exist, with the optimal method being debated in the literature. The Coleman technique involves allowing harvested fat to settle by gravity and then centrifuging at low speed (3000rpm for 3 minutes) to separate the fat into three layers: oil (from damaged cells) on top, viable fat in the middle, and tumescent fluid/blood at the bottom. The viable middle layer is extracted for injection.

Decanting (gravity separation) is a gentler alternative that avoids centrifugation entirely, relying on gravity to separate layers over 10-15 minutes. Some surgeons prefer this method, arguing that it minimises mechanical trauma to the adipocytes. Washing involves rinsing harvested fat with saline to remove blood, free oil, and debris. Filtration uses specialised mesh filters to separate viable fat from liquid components.

Injection Technique

The key principle of fat injection is the delivery of small aliquots (tiny parcels of fat) in multiple tissue planes, creating a three-dimensional lattice of grafted tissue. Each aliquot should be small enough (0.1-0.5ml per pass) to ensure adequate contact with surrounding vascularised tissue, as fat cells rely on diffusion of nutrients from adjacent blood vessels until neovascularisation occurs (typically by day 48 post-grafting).

For facial fat grafting, a blunt cannula is used to make multiple passes in the subcutaneous, submuscular, and periosteal planes. Overcorrection of 20-30% is typically performed to account for the expected partial resorption of grafted fat. For body applications, larger volumes are placed in broader tissue planes.

Fat Survival and Predictability

The single most discussed aspect of fat transfer is the survival rate of grafted fat — and its unpredictability. Published survival rates range from 30-80% depending on the technique, the recipient site, and the surgeon’s experience. Several factors influence survival. Gentle harvesting and processing that minimise fat cell trauma improve viability. Small aliquot injection ensures adequate nutrient diffusion. Recipient site vascularity is important — well-vascularised areas support better fat survival. Patient health including smoking status, diabetes, and overall cardiovascular health affects outcomes. Post-operative care including avoidance of pressure on grafted areas during the early healing period is crucial.

This variability means that touch-up procedures are frequently required. Patients should be counselled that one procedure may not achieve the final desired result, and a second session 3-6 months later may be needed for optimal correction.

Facial Fat Transfer: A Detailed Look

Facial fat grafting addresses the generalised volume loss that characterises facial ageing. Key treatment areas include the temples, periorbital region (under-eye hollows and upper lid), cheeks and midface, nasolabial folds, lips (though results are less predictable here), jawline and chin, and perioral area (marionette lines, oral commissures).

The procedure is typically performed under local anaesthesia with sedation, though general anaesthesia may be used for extensive treatments. Total operative time is 1-3 hours depending on the number of areas treated and the complexity of the case.

Recovery After Facial Fat Transfer

Patients should expect significant swelling (particularly around the eyes if the periorbital area is treated) for 1-2 weeks, bruising at both the donor and recipient sites for 7-14 days, numbness at the donor site for several weeks, and an initial over-corrected appearance that gradually settles as swelling resolves and some fat is reabsorbed. Most patients feel comfortable returning to social activities after 10-14 days, though the final settled result is not apparent for 3-6 months.

Safety and Risks

Fat transfer has an excellent safety profile when performed by experienced surgeons. Potential complications include asymmetry (the most common reason for revision), overcorrection or undercorrection, fat necrosis (death of transplanted fat, which can present as firm lumps), oil cysts, infection, and donor site complications (contour irregularities, seroma). For body fat transfer, the Brazilian Butt Lift (BBL) carries specific risks related to fat embolism, and rigorous safety protocols must be followed.

In the UK, fat transfer procedures should be performed by GMC-registered surgeons — ideally on the specialist register for plastic surgery — working from CQC-registered facilities.

Fat Transfer vs. Synthetic Fillers

The choice between fat transfer and synthetic fillers depends on the patient’s goals, anatomy, and preferences. Fat transfer is preferred when large volumes are needed, when the patient desires permanent or semi-permanent results, when the regenerative benefits of fat are desired, and when donor site fat removal is also a goal. Synthetic fillers are preferred for small volume corrections, when reversibility is desired, when the patient wants to avoid a surgical procedure, and for areas where fat survival is unpredictable (such as the lips).

Many practitioners offer both options, and the best choice is determined during a thorough consultation that considers the patient’s overall treatment goals and individual anatomy.

Frequently Asked Questions

Related reading: Body Contouring: Surgical vs Non-Surgical | Understanding Facial Volume Loss | Understanding Cheek Augmentation Options