Gluteal augmentation is any procedure designed to add volume, shape, or projection to the buttocks. It ranges from major surgery involving implants or fat transfer to minimally invasive injections that stimulate collagen growth over time. In 2024, more than 30,700 surgical gluteal augmentation procedures were performed in the United States alone, with fat grafting accounting for the vast majority.
The three main approaches differ significantly in how they work, how long results last, and what recovery looks like.
Fat Transfer (Brazilian Butt Lift)
The Brazilian Butt Lift, or BBL, is by far the most popular form of gluteal augmentation. Nearly 29,500 were performed in 2024, compared to roughly 1,250 implant procedures. The concept is straightforward: fat is removed from one part of your body through liposuction, processed, and then injected into the buttocks to create fuller, rounder contours.
Surgeons typically harvest fat from the upper back, flanks, lower back, and inner and outer thighs. These areas surround the buttocks, so removing fat from them creates a slimming effect that makes the augmented buttocks look even more prominent. Once enough fat is collected, it’s injected in small amounts using a fan-like pattern to distribute volume evenly and avoid sharp, unnatural transitions. Surgeons inject tiny quantities per pass, sometimes as little as 0.3 milliliters at a time, building shape gradually.
Not all the transferred fat survives. Clinical studies report retention rates between 30% and 70%, meaning a significant portion of the injected volume is reabsorbed by the body over the following months. This is why some people need a second procedure to reach their goal. The fat that does survive becomes living tissue with its own blood supply and behaves like any other fat in your body, growing or shrinking with weight changes.
Gluteal Implants
Implants are solid silicone devices placed inside or beneath the gluteus maximus muscle. They’re typically chosen by people who don’t have enough body fat for a BBL or who want a more dramatic, predictable increase in projection.
Where the implant sits matters. Older techniques placed implants on top of the muscle or within its fibers (intramuscular placement), but this approach has been linked to muscle thinning over time and higher rates of complications like fluid buildup, wound separation, and implant visibility through the skin. Submuscular placement, where the implant goes beneath the gluteus maximus in the space between it and the deeper gluteus medius, provides better coverage. Implants placed in this deeper position are nearly undetectable by sight or touch, regardless of size.
Complication rates for implants are higher than for fat transfer. Studies report overall complication rates up to 30%, including infection, fluid collection, wound separation, and implant shifting. Newer techniques using a shallower intramuscular pocket have brought complication rates below 15% in some studies, but implants still carry more surgical risk than fat grafting.
Non-Surgical Options
For people who want modest enhancement without surgery, injectable treatments offer a less invasive path. The most well-known option uses a collagen-stimulating compound that prompts your body to gradually build volume in the treated area. Rather than adding bulk directly, it triggers your skin and tissue to produce new collagen fibers over several months.
Full results typically appear about six months after the first treatment session, and the effects last two to three years. The volume increase is subtle compared to surgical options. Non-surgical gluteal augmentation works best for people looking for mild lifting and contouring rather than a significant size change.
Safety Concerns With Fat Transfer
The BBL carries a unique and serious risk: fat embolism. If fat is accidentally injected into or beneath the gluteal muscle, it can enter large veins that lead directly to the lungs. This was a leading cause of BBL-related deaths before safety guidelines changed.
After 2018, major medical societies recommended that fat should no longer be injected under the muscle. Surgeons now focus on keeping injections in the layer just above the muscle, using careful technique to angle the injection tool parallel to the muscle surface. In South Florida, one of the highest-volume regions for this procedure, surgeons are now required to use ultrasound during the injection to confirm they’re placing fat in the correct tissue layer.
If you’re considering a BBL, asking whether your surgeon uses ultrasound guidance during injection is one of the most important safety questions you can raise.
What Recovery Looks Like
Recovery from a BBL centers on one major restriction: not sitting directly on your buttocks. Pressure on the newly transferred fat can damage the fragile cells before they establish a blood supply, reducing how much volume survives.
For the first 10 days after surgery, you should avoid sitting entirely. After that, sitting is allowed only with a special BBL pillow, which shifts your weight to your thighs and keeps pressure off the buttocks. Most surgeons allow normal sitting at six weeks, though some permit it as early as three to four weeks. During this entire period, tight clothing that compresses the buttocks should be avoided.
Implant recovery follows a similar timeline but involves more pain in the early days because the muscle has been surgically separated. Sitting restrictions are generally less strict with implants since there’s no concern about fat cell survival, but physical activity is limited for several weeks while the implant pocket heals.
How Results Compare Across Methods
- Fat transfer (BBL): Natural look and feel. Results are permanent once the surviving fat stabilizes, usually by three to six months. Volume can fluctuate with weight changes. May require a second procedure due to resorption.
- Implants: Predictable, permanent volume that doesn’t change with weight. Higher complication rate. Can feel firmer than natural tissue, though submuscular placement minimizes this.
- Non-surgical injections: No downtime, minimal risk, but results are subtle and temporary (two to three years). Best for mild contouring rather than significant augmentation.
The right approach depends on your starting anatomy, how much change you’re looking for, and how much downtime you can afford. People with ample donor fat in their midsection and thighs are natural candidates for a BBL. Those with a lean frame who want noticeable projection may be better suited to implants. And anyone looking for a low-commitment improvement can start with non-surgical options to see how they feel about a fuller shape before committing to surgery.