What Is the Penuma Implant? Surgery, Cost, and Risks

The Penuma is a medical-grade silicone implant surgically placed beneath the skin of the penis to increase its girth and improve its appearance when flaccid. It is the only penile enhancement implant that has received FDA clearance in the United States, and it is designed specifically for men who already have normal erectile function but want a larger-looking penis at rest.¹ The procedure is entirely elective and cosmetic, which shapes everything from how it’s paid for to how carefully you should weigh its risks.

How the Device Works

The Penuma is a crescent-shaped silicone sleeve, not a full tube. It wraps around the top and sides of the penile shaft but does not extend all the way around the underside, leaving the urethra and the sensitive ventral structures uncovered.² During surgery, the implant is slid into a pocket created just beneath the skin. A surgical mesh is placed near the tip of the penis, and the sleeve is stitched to that mesh with permanent sutures to keep it from migrating. The proximal end of the sleeve extends up toward the pubic area, sitting just above the top surface of the penile shaft.

The implant comes in different sizes (typically labeled small, medium, large, and extra-large), and the surgeon selects one based on the patient’s anatomy. Because it sits in the subcutaneous layer rather than inside the erectile bodies, it does not interfere with the mechanism of erection itself. The penis inflates and deflates through its own natural blood-flow system; the silicone sleeve just adds bulk around the outside.

What Kind of Size Change to Expect

The most consistent effect is an increase in girth. In a retrospective review of 400 patients by the device’s original surgeon, midshaft circumference rose from an average of roughly 8.5 centimeters to about 13.4 centimeters, an increase of close to 57%.³ A separate single-center study reported that flaccid length also increased, going from about 8.1 centimeters to about 12.3 centimeters on average, a roughly 52% gain.⁴

These numbers describe how the penis looks and measures when flaccid. The device is not designed to increase erect length, and most marketing and study data center on the resting state. If your primary concern is erect size, the Penuma may not address it the way you expect. The added silicone does provide some visual and tactile bulk during an erection, but the erect shaft’s functional dimensions are governed by the erectile tissue inside, which the implant does not alter.

What FDA Clearance Actually Means Here

The Penuma received FDA 510(k) clearance, which is a regulatory pathway that applies to devices judged to be substantially similar to something already on the market.¹ This is not the same as FDA approval, which involves a more intensive review of clinical trial data. The 510(k) pathway requires that the manufacturer demonstrate the device is safe and functions as intended, but it does not demand the kind of large randomized trials that a new drug would need. Many commonly used medical devices, from certain breast implants to orthopedic screws, enter the market through the same pathway.

What this means in practice is that the Penuma has cleared a real regulatory bar for safety and biocompatibility, but the evidence base behind it is still relatively slim compared to, say, an inflatable penile prosthesis used for erectile dysfunction, which has decades of multicenter data. Most published Penuma studies involve a small number of surgeons and relatively short follow-up periods. That does not automatically make the device dangerous, but it means you are working with less long-term data than you might assume the phrase “FDA-cleared” guarantees.

The Surgery and Recovery Timeline

The operation is typically performed under general anesthesia and takes roughly one to two hours. The surgeon makes an incision, usually in the suprapubic area or through a penoscrotal approach, creates the subcutaneous pocket, positions the implant, secures it, and closes the incision. Patients generally go home the same day.

Recovery involves meaningful lifestyle restrictions. You should expect swelling and bruising for several weeks. In published protocols, patients were followed weekly for the first two months and monthly after that.⁵ Sexual activity is typically off-limits for about two months after the procedure. Smokers are asked to quit at least two weeks before and six weeks after surgery, because smoking impairs wound healing and raises infection risk. Uncontrolled diabetes, active skin infections, and recurrent urinary tract infections are all exclusion criteria that can disqualify candidates.

The weeks of restricted activity can be harder to navigate than people expect. You’ll need to avoid strenuous exercise and anything that puts pressure on the surgical area. Some men report that the initial swelling makes the result look dramatically different from the final outcome, and it can take three to six months for things to settle into their long-term shape.

Complications While the Implant Is in Place

No surgery is risk-free, but the Penuma has a specific complication profile worth understanding before you commit. A multi-institutional study reported the following rates among patients who still had their implants: infection occurred in about 1.3% of cases, fluid collection around the implant (seroma) in about 2%, and erosion of the implant through the skin in 5%. New-onset erectile dysfunction was reported at 0%.⁶

A broader review of penile enhancement complications lists additional device-specific problems, including capsular contracture (where scar tissue tightens around the implant), curvature of the penis, and perceived shortening.⁷ Some of these can be managed with antibiotics, wound care, traction devices, or revision surgery. Others require removal of the implant entirely.

The complication that most commonly leads to removal deserves its own mention: distal protrusion. This is when the edge of the silicone sleeve near the head of the penis pushes outward and becomes visible or palpable, causing discomfort for both the patient and his partner. In one series, this was the reason for explant in roughly two-thirds of cases that needed the device taken out.²

What Happens If the Implant Needs to Come Out

This is arguably the most important section for anyone considering the procedure, because the consequences of removal are substantially worse than most patients anticipate. The Penuma is not something you can simply take out and return to your pre-surgery baseline. The body forms scar tissue around any implant, and in the case of the Penuma, that scarring can be severe.

In a study of patients who had their Penuma removed, surgeons routinely found dense scar tissue along the neurovascular bundles, from the head of the penis all the way back to the pubic area. That scarring was often tightly stuck to the nerves and blood vessels that supply sensation and blood flow.² The consequences were striking:

• Curvature: 63% of patients developed disabling dorsal curvature after removal, defined as severe enough to interfere with intercourse.
• Shortening: 50% experienced measurable penile shortening.
• Sensory changes: 44% had altered sensation.
• Infection: 38% developed localized infections following the removal surgery.
• Erectile dysfunction: 32% developed new erectile dysfunction they did not have before the original implant.

Most of these patients required additional corrective surgery, called scar revision, to address the curvature and restore function. All patients who underwent that corrective procedure saw improvement in curvature and regained functional erections, but some needed medications or injections to get there.² The point is that removal is not a simple undo. It can set off a chain of problems that takes months of additional treatment to resolve, and some patients never fully return to their pre-implant state.

Cost and Insurance Coverage

The Penuma procedure typically costs between $15,000 and $20,000 or more, depending on the surgeon, the geographic area, and whether any additional procedures are performed at the same time. That figure usually includes the implant itself, surgeon fees, anesthesia, and facility costs, but you should confirm exactly what’s included before signing on.

Because the surgery is purely cosmetic and elective, health insurance does not cover it. There is no medical diagnosis that justifies it in the eyes of insurers; the device is designed for men who already have normal erections and normal anatomy but want a different appearance. Some practices offer financing plans or payment through medical credit services, but this is still an entirely out-of-pocket expense. If complications arise that require additional surgery, those costs can add up quickly and may also fall outside insurance coverage if the insurer considers them related to an elective cosmetic procedure.

Who Actually Seeks This Surgery

Research on men who pursue penile augmentation consistently finds that many of them have objectively average or normal penile dimensions but perceive themselves as below average. This perception often comes with real anxiety and distress.⁸ Clinicians in this space increasingly recommend a psychological evaluation before proceeding with surgery, partly because some men may have body dysmorphic tendencies where the dissatisfaction is rooted in perception rather than physical reality, and surgery is unlikely to resolve that underlying distress.

That said, not everyone who considers the Penuma fits this profile. Some men have experienced changes from aging, weight gain, or medical conditions that have altered their anatomy in ways they find genuinely bothersome. Others have conditions like buried penis syndrome or have undergone treatments for prostate cancer that changed the appearance or function of the penis. The key is that any candidate should have a clear-eyed understanding of what the device can and cannot do, ideally informed by a conversation with both a urologist and a mental health professional.

Finding a Surgeon

Only a small number of surgeons in the United States are trained to perform Penuma implantation.⁹ The manufacturer maintains a credentialing program, and the procedure is not something a general urologist would typically perform without specific training. This limited surgeon pool has practical implications: you may need to travel, wait times for consultations can be long, and your options for getting a second surgical opinion may be limited.

When evaluating a surgeon, ask about their total case volume, their complication rate, and specifically how many of their patients have required revision or removal. Ask whether they track long-term follow-up data. The published literature is still dominated by a handful of practices, which means the outcomes you read about may not be representative of every surgeon now offering the procedure. A surgeon who has done twenty cases is working with a fundamentally different experience level than one who has done several hundred, and in a procedure where technique matters enormously for avoiding distal protrusion and erosion, that difference matters.

How the Penuma Differs from Other Enhancement Approaches

Men researching penile enhancement will encounter a range of options, from injectable fillers to fat transfer to ligament-release surgery. Each has a different risk profile and set of trade-offs. Injectable fillers, such as hyaluronic acid, are less invasive and reversible, but results tend to be temporary, and the risk of lumps, migration, and uneven contours is real. Fat transfer can add girth but has unpredictable absorption rates, with a significant portion of the injected fat being reabsorbed by the body within months. Ligament-release surgery can add some visible flaccid length but does not affect erect length and can result in instability during intercourse.

The Penuma’s advantage is that it provides a more consistent and durable girth enhancement than these alternatives. Its disadvantage is that it’s a real surgical implant with all the risks that entails, including the severe post-removal complications discussed above. No other common enhancement procedure carries quite the same stakes if things go wrong, because there is no other procedure that leaves dense scar tissue wrapped around the neurovascular structures in the same way. This is the fundamental trade-off: more reliable results, but a harder exit if the outcome isn’t what you wanted.

Sensation and Sexual Function After Implantation

One of the most common questions men have is whether the implant changes how sex feels. The multi-institutional study cited earlier found 0% new-onset erectile dysfunction while the implant was still in place, which is reassuring on the erection front.⁶ Sensation changes while the device is in place appear uncommon. In one series, adverse sensation changes occurred in two patients after implantation.¹⁰

Partners sometimes report that the added girth changes the experience of intercourse, for better or worse depending on the couple. The silicone sleeve does not feel the same as natural tissue from the outside, and some partners notice a difference in firmness or texture. If the distal edge of the implant protrudes near the head of the penis, that can cause friction or discomfort for a partner during sex, which is the main reason distal protrusion leads to removal rather than just revision.

The much larger concern, as covered earlier, is what happens to sensation and function if the implant needs to come out. The rates of new erectile dysfunction and sensory changes after removal are substantially higher than during the implant’s time in place, and that asymmetry is something every candidate should understand before surgery. The implant may work perfectly well for years, but if it eventually needs removal for any reason, the exit can be rougher than the entry.

The Evidence Gap

The honest state of the science here is that the Penuma is still relatively understudied compared to most surgical implants. Most published data comes from a small group of high-volume surgeons, and follow-up periods in most studies span a few years rather than a decade or more. There are no large randomized controlled trials comparing the Penuma to sham surgery or to alternative enhancement methods. The complication rates reported in multi-institutional studies are useful but come from centers with the most experience, which likely means they represent a best-case scenario rather than the average outcome across all surgeons now performing the procedure.

The post-removal data is particularly thin. The study documenting severe scarring and high rates of curvature, shortening, and erectile dysfunction after explant involved 16 patients at a single institution specializing in reconstructive urology.² That is a small sample, and patients referred to a reconstructive center for complications likely represent more severe cases. Still, the findings are concerning enough that any responsible surgeon should discuss them in detail during a pre-operative consultation. The absence of long-term, population-level data is itself a risk factor. You are, in a meaningful sense, an early adopter if you get this procedure, and early adopters always bear more uncertainty than people who come along once a device has been in wide use for twenty years.