After prostatectomy: rebuilding the erection

What the surgery did

The nerves that trigger an erection run in two bundles pressed against the back and sides of the prostate, wrapped in the same fascia. Removing the prostate means peeling them off a tumor without cutting them, and even a perfect dissection stretches, heats, and bruises them. The result is neuropraxia: intact nerves that have stopped conducting. They recover, slowly, at the pace nerves regrow, which is why the honest timetable for unassisted erections is twelve to twenty-four months and why the first three months tell you almost nothing.

The second problem is what happens to the tissue while it waits. A healthy penis fills several times a night during sleep, and those nocturnal erections are how the erectile chambers get their oxygen. Silence the nerves and the chambers sit flaccid and underperfused for months. Hypoxic smooth muscle dies and is replaced with collagen, the sheath stiffens, the veins that should clamp shut during an erection stop sealing, and the penis measurably shrinks, typically one to two centimeters in the first six months. This is the part the nerves cannot undo when they wake up: a scarred chamber that leaks will not hold an erection no matter how good the signal.

That is the whole logic of penile rehabilitation. You cannot hurry the nerves. You can keep the tissue alive, oxygenated, and stretched so that there is something worth reconnecting to when they return. Everything below is a way of doing that.

What the rehabilitation trials actually showed

The idea was born in a 1997 trial of thirty men: those given alprostadil injections three times a week starting a month after surgery recovered spontaneous erections far more often than those left alone. It was small and it was unblinded, but it launched a field. What came after is more sobering and more useful:

• Nightly sildenafil (2008, 76 men, placebo-controlled): 27% of the treated group reported the return of unassisted erections at a year, versus 4% on placebo. Encouraging, but the study was stopped early and the numbers are small.
• Nightly versus on-demand vardenafil (2008, 628 men, the REINVENT trial): on-demand use was as good as or better than a nightly dose while men were taking it, and after a two-month washout, neither beat placebo on unassisted function. The nightly dogma took its first real hit here.
• Daily tadalafil (2014, 423 men, the REACTT trial): daily 5 mg gave better erections than placebo during the nine months of treatment and, notably, reduced penile length loss by about 4 mm. After a six-week washout, unassisted recovery was the same in all three groups, roughly one in five.
• Early vacuum device (2007, 28 men): starting daily vacuum use one month after surgery, rather than six, preserved length and improved erectile scores at every follow-up.

Put together, the pattern is consistent. PDE5 inhibitors and vacuum devices protect the tissue: less shrinkage, better assisted erections, a penis that is still structurally sound when the nerves return. What they have not been shown to do is accelerate the nerves. That distinction is why the AUA/SMSNA guideline says clinicians should inform men about rehabilitation while calling the evidence for any specific protocol limited, and why a good program is framed as preservation rather than a countdown to a fixed date.

In practice, most programs combine the tools. A daily low-dose or on-demand PDE5 inhibitor from the first weeks, a vacuum device used for a few minutes daily without the constriction ring to stretch and perfuse the chambers, and, if pills produce nothing by around three months, intracavernosal injections that bypass the nerves entirely and produce a full erection on demand. Injections are the most reliable tool in the box precisely because they do not need a nerve signal, and the four-hour rule applies to them exactly as it does outside of rehabilitation.

The pelvic floor: the deep dive

Continence, climacturia, and rigidity from one set of muscles

Most men are handed a pelvic floor leaflet for the leaking and never told the same muscles are part of the erection. They are. Two striated muscles sit at the root of the penis, under conscious control like any skeletal muscle. The ischiocavernosus wraps each crus, the buried leg of each erectile chamber, and when it contracts it squeezes the crura and pushes intracavernosal pressure well above what blood pressure alone can supply. That is what converts a full erection into a rigid one. The bulbospongiosus wraps the bulb of the urethra and the deep dorsal vein; contracting it helps trap blood in the shaft and drives ejaculation. Weak or poorly coordinated, these muscles let blood escape, which reads clinically as venous leak. After a prostatectomy they have also just lost the internal sphincter they used to share the work with, which is why they matter twice.

What the trials found

• After prostatectomy, for erections. A 2012 randomized trial in Brazil started biofeedback-guided pelvic floor training fifteen days after catheter removal. At twelve months, 47% of the trained group were potent versus 12.5% of controls who got verbal instructions only. Fifty-two men, so treat the size of the effect with care, but a number needed to treat of three is hard to ignore. The same trial found continence status was the strongest predictor of erectile recovery, which fits: the muscles that hold urine are the muscles that hold blood.
• After prostatectomy, for climacturia. Leaking urine at orgasm affects a fifth to a third of men after surgery and is rarely mentioned in advance. A 2016 Belgian randomized trial in men with persistent erectile dysfunction a year after surgery found three months of pelvic floor training improved erectile scores and reduced climacturia compared with waiting.
• For erectile dysfunction in general. The foundational 2005 UK trial randomized 55 men with erectile dysfunction, not surgical patients, to pelvic floor training plus lifestyle advice versus advice alone. At six months, 40% had regained normal erectile function and another 35% had improved. The authors argued it should be first-line, and two decades later it is still under-prescribed.
• For continence. Guidelines recommend training before and after surgery to shorten the leaking phase. Meta-analyses disagree on how large the benefit is, but the direction is consistent and the downside is nil.

How the training actually works

The reason leaflets underperform trials is that the trials used a pelvic floor physiotherapist, and the difference is not motivation, it is targeting. Most men asked to “do a Kegel” clench the buttocks, bear down with the abdomen, or hold their breath, all of which train the wrong thing and can worsen leaking. What a good program looks like, as literacy so you can recognize one:

• Finding the muscle. The cues that work are “shorten the penis” and “lift the testicles,” not “stop the flow.” A physiotherapist confirms it with real-time ultrasound on the lower abdomen, so you can watch the base of the bladder lift, or with a fingertip on the perineum. Biofeedback is what the positive trials used.
• Two kinds of contraction. Fast, maximal squeezes train the reflex that catches a cough or a leak. Slow holds of several seconds build the endurance that keeps an erection rigid. Programs use both, in sets, several times a day, with full relaxation between reps because a muscle that cannot relax cannot contract well either.
• Positions and progression. Lying first, then sitting, standing, and eventually during movement and during erection itself, where the ischiocavernosus can be felt to add rigidity. Higher-volume programs, on the order of a hundred-plus contractions a day in the first weeks, have recovered continence faster in trials than gentler ones.
• Start before surgery when possible. Learning the contraction while the anatomy is intact and pain-free is far easier than learning it with a fresh wound. Several weeks of prehab is the norm in centers that take this seriously.
• Weeks, not days. Continence gains show inside a few weeks. Erectile gains lag by months, in line with the trials above, and they compound with the tissue-protection tools rather than replacing them.

Ask your surgeon for a referral to a pelvic floor physiotherapist who treats men; the specialty exists and it is not the same as a general physio. Insurance coverage for post-prostatectomy pelvic floor rehabilitation is common in the US when a urologist orders it.

The frontier

Emerging

This is the section that gets rewritten most often, because the science here is arriving fast. Everything below is real research, graded honestly:

The things nobody mentions

Orgasm survives the surgery, and it is dry: no prostate, no seminal vesicles, no ejaculate. Some men find it more intense, some less, and some notice pain with orgasm in the early months that usually fades. Climacturia, covered above, is common, embarrassing, and trainable. The penis is often shorter, and rehabilitation exists largely to limit that. Peyronie's-type curvature can appear in the year after surgery in a minority of men, and it is treated the same way as any other Peyronie's, once stable.

And the relationship. The men who do best in every follow-up study are the ones who kept having sex, assisted and imperfect, through the recovery, rather than waiting for the erection to come back on its own before trying. Partners who are told the plan become part of it. A sexual-medicine clinician or sex therapist attached to the cancer center is not a luxury add-on; it is the part of the program that keeps the rest of it happening.

The bottom line

Erections after prostatectomy come back on the nerves' schedule, which is slow, and only to tissue that has been kept alive in the meantime. Rehabilitation is preservation: a PDE5 inhibitor, a vacuum device, injections if needed, all started early, none of them proven to hurry the nerves and all of them protecting what the nerves will need. The pelvic floor is the piece most programs underweight and the one with the widest payoff, from continence to rigidity, provided it is taught properly. The frontier is genuinely moving, with NeuroSAFE already changing what happens in the operating room and regenerative approaches behind it. Ask for the whole program, start it early, and bring your urologist a plan, not a hope.

Common questions