Fat graft survival: what retention means and what influences it

Quick answer

Fat graft survival is the percentage of injected fat volume that remains at follow-up. Every graft loses part of its volume in the first months. Reported rates vary widely because technique, site, volume, patient factors and measurement method all differ, so a percentage is only meaningful with its time point, sample size and method.[1]

How it is measured

Volume is compared before surgery, right after injection and at follow-up using 3D surface imaging, MRI or ultrasound; clinical estimation is less precise. Different methods give different numbers for the same patient.[1]

Factors

• Harvest and processing technique, injection in small aliquots.
• Recipient-site blood supply and tissue softness.
• Donor site (subject of a 2026 systematic review).[2]
• Patient health, weight stability, smoking.
• Postoperative pressure and movement.
• Cell enrichment (cell-assisted lipotransfer).[5]

Study results

A 2023 single-center study by SC301's representative director reported, in 384 women after SVF-enriched breast fat grafting, retention of 78.65% at 3 months, 77.17% at 6 months and 77.48% at 18 months (102 patients, left breast). Retention was higher with more SVF cells and softer breasts, and lower in the right breast (60.35%).[3] An earlier 2020 series of 105 patients reported 73.7% engraftment at 6 months, with higher rates when more than 60 million ADSC were delivered.[4]

How to read provider figures

SC301 presents 77.48% as its average retention. The number is real and peer-reviewed, but it is a provider-authored, single-center measurement at a specific time point without a control group. It should not be read as a universal SVF fat grafting retention rate.[3]

Limitations

Independent randomized data comparing SVF-enriched and conventional breast fat grafting are limited; heterogeneity in methods prevents pooling many studies.[5]