The short answer
Filler is a 30-45 minute injection with no surgery and, with hyaluronic acid, reversibility. Penuma is a surgically implanted silicone sleeve. The SMSNA classifies Penuma as investigational, citing removal rates as high as 11% and significant complications after explantation.
Two Very Different Propositions
| Penile filler | Penuma / implant |
|---|
| Procedure | Injection, 30–45 min | Surgery, general anaesthesia |
| Recovery | Days | Weeks, with abstinence period |
| Reversible | Yes, if hyaluronic acid | Requires explant surgery |
| Material | Dermal filler | Silicone sleeve |
| Society position | Limited data, acceptable safety | Investigational, IRB oversight advised |
What the SMSNA Says About Penuma
This is the part most comparison pages omit, and it is the part that should carry the most weight.
The SMSNA's 2024 position statement classifies subcutaneous silicone implants as investigational, recommending they be performed only under institutional review board oversight, without cost to the patient, by experienced surgeons, and only after comprehensive discussion of complications.
The data behind that position:
- The initial published series of 400 men reported 81% satisfaction at four-year follow-up, with 3–5% removal rates.
- Subsequent reports showed removal rates as high as 11% within nine months to three years.
- External providers reported severe complications after explantation in 60–80% of cases, including dorsal curvature in 77%, shortening in 62%, sensory changes in 15% and erectile dysfunction in 15%.
The statement concludes: "It is therefore anticipated that many men undergoing device placement will eventually have the devices explanted at some point," and that insufficient data exist to adequately counsel patients on the true risk-to-benefit ratio.
Read that carefully
The concerning figure is not the removal rate on its own. It is what happens after removal — curvature, shortening, sensory change and erectile dysfunction reported in the majority of explant cases by external providers.
A reversible filler carries nothing comparable. That asymmetry in downside risk is the central difference between these two options.
Where the Implant Has Advantages
We are not going to pretend otherwise. An implant produces a larger and more consistent change than injectables, in both flaccid and erect states, and it does not require maintenance. For some men, that is worth the surgical risk, and that is a legitimate choice made with full information.
What we would insist on is that the information be full — including the explant data above, which is not prominent in most marketing.
Where Filler Has Advantages
- No surgery, no general anaesthesia. A 30 to 45 minute appointment.
- Reversible with hyaluronic acid — the single biggest difference.
- Recovery in days rather than weeks.
- You can try it. A temporary result lets you find out whether you actually like the change before committing to anything lasting.
- Lower stakes if it goes wrong. Nodules and asymmetry are correctable. Explant complications are not, easily.
Realistic Expectations
Filler produces roughly 2 to 3 cm of circumference — see the measured data. If your goal requires substantially more than that, filler will not deliver it, and we will say so rather than take your money.
Neither option increases length. See girth vs length for why, and what the AUA says about lengthening surgery.
