The Process That Actually Works for Smooth Buttocks & Thighs
A dimple on the back of the thigh isn’t a skin problem. It’s a rope.
Fibrous septa run from the deeper tissue up to the underside of your skin, anchoring it like guy lines on a tent. Fat sits in lobules between them. When the fat pushes outward and the septa don’t lengthen to match, the tethered points stay put while everything around them rises. You get a depression, and the tissue around it looks fuller by contrast.
That’s why the cream aisle has never worked. Caffeine doesn’t cut a band. Neither does lymphatic massage, dry brushing, or any amount of squats. And it’s why radiofrequency and laser platforms underdeliver on cellulite specifically. They act on fat and skin, which are the two things that aren’t holding the dimple down.
So the two-step process exists for a straightforward reason: there are two separate problems under that depression. Something is pulling down, and something is missing.
Step One
Cutting the band is called subcision, and the current generation of devices made it precise rather than exploratory. The Avéli device is advanced under the skin to the suspect band, the operator tugs on it with a blunt link to see whether the dimple deepens on the surface, and only then exposes the sharp edge and releases it. Confirm, then cut. That verification step is the actual innovation, because blind subcision cuts whatever it finds.
The pivotal study in Aesthetic Surgery Journal ran 68 women through a single session under dilute local anesthetic, averaging 20 depressions treated per person, with a range of 6 to 45. Cellulite Severity Scale scores fell by 1.5 points. On the global aesthetic scale, 80.9% were rated much or very much improved. Average procedural pain was 1.1 out of 10, and 75% were back to normal activities within a day. The FDA extended the device’s clearance on September 1, 2022 to long-term reduction of cellulite in the buttocks and thighs, based on a year of follow-up.
Now the part the clinic website leaves off the same study. Bruising occurred in 86.8% of patients and lasted an average of 34.4 days. Tenderness in 51.5%, averaging 19.9 days. Just over half took oral painkillers for about five days.
A month of bruising. Remember that number, it matters later.
For durability, the older device makes the point better. Cellfina was cleared in October 2016 for improvement with no loss of benefit for up to three years, on a 55-patient study where 93% were still satisfied at the three-year mark. Cut bands don’t grow back as bands. That’s the mechanical advantage of this approach over anything that works by swelling tissue or tightening skin.
Worth knowing what didn’t survive: QWO, the injectable enzyme that dissolved septa chemically, was approved and then pulled from the market on December 12, 2022. Endo cited the extent and variability of bruising, plus prolonged skin discoloration. The enzyme worked on the band. Patients wouldn’t accept the aftermath.
Step Two
Release the tether and the pinned skin lifts. What release can’t do is replace volume that isn’t there, and in some depressions, particularly on the upper buttock and the outer thigh of someone who has lost weight, there’s a genuine hollow left behind. Hence the filling half: allograft adipose matrix like Renuva, poly-L-lactic acid, or fat transferred from somewhere else on your body.
The anatomy of that argument is sound. The evidence behind it is much thinner than the evidence behind step one, and you should hear that from a writer rather than discover it later.
Start with the FDA, which states that fillers are approved for lips, cheeks, chin, and the back of the hand, and which recommends against using any injectable filler to increase the size of the buttocks. Nothing in the filler category carries an approval for the area this article is about. Renuva, the product most often paired with septa release, is processed donor adipose matrix rather than a filler, and its published pilot study covered 10 patients with hollow temples followed for 24 weeks. Temples. Not buttocks, not cellulite, not three years. Poly-L-lactic acid in the buttock is off-label use of a facial product. Fat grafting is your own tissue and has the deepest evidence base of the three, but it’s an operation, and the multisociety task force warnings about injecting fat into gluteal muscle exist because people have died from that.
None of this makes step two wrong. Off-label isn’t a synonym for reckless, and experienced injectors get good results in this area every week, including many noteworthy cellulite treatment programs that actually lead to consistently good results. But it does mean the two steps don’t sit on the same evidentiary footing, and a practice that presents the pair as one validated protocol is flattening something you’d want to know.
Don’t Buy Both on the Same Day
Go back to the bruising figure. An average of 34 days.
If your post-procedure assessment is at four weeks, you are looking at a bruised, swollen, half-settled approximation of your result and making a purchasing decision about volume. That’s buying blind. Released skin keeps lifting for weeks, and depressions that looked like they’d need filler at the consult often don’t need it at three months.
So separate the appointments. Release first, wait a full quarter, then stand in the same light and look again. Whatever hollow is still there is the real one, and now you know how much volume you’re actually buying.
Ask the practice three things before you book: how many bands they expect to release and how they confirm each one, what they use for volume and whether that use is on-label, and how long they’ll make you wait before the second step. The last answer tells you the most. A practice that sells you release and then tells you to go away for three months is one that expects to be judged on the final result. A package deal with both steps on the same afternoon is solving a scheduling problem, and it isn’t yours.
