Simple vs. Radical Prostatectomy: What Each Surgery Removes

Simple prostatectomy and radical prostatectomy are two fundamentally different operations that treat different conditions, even though both involve removing prostate tissue. A simple prostatectomy strips out the enlarged inner portion of the prostate to relieve urinary blockage caused by benign prostatic hyperplasia (BPH), while a radical prostatectomy removes the entire prostate gland and surrounding structures to treat cancer. The confusion between them is understandable since the names sound similar, but the goals, the extent of tissue removal, and the recovery profiles are distinct enough that a surgeon would rarely consider them interchangeable.

What Each Surgery Actually Removes

The prostate gland has an inner zone (the transition zone) that tends to grow as men age, eventually squeezing the urethra and making urination difficult. In a simple prostatectomy, the surgeon shells out this overgrown inner tissue, leaving the outer capsule of the prostate intact. Think of it like scooping the flesh out of an avocado while leaving the skin. The capsule, the surrounding nerves, and the seminal vesicles all stay in place. Because the capsule remains, the procedure is less disruptive to the structures that control continence and erections.

A radical prostatectomy takes everything: the entire prostate gland, the capsule, the seminal vesicles, and sometimes nearby lymph nodes. The urethra has to be reconnected directly to the bladder afterward. This more extensive removal is necessary when the goal is to eliminate cancer that may have spread through different zones of the gland. The word “radical” refers to the completeness of the removal, not to anything dramatic about the technique.

When Each Procedure Is Recommended

Simple prostatectomy is reserved for men with very large prostates, typically above 80 to 100 grams, whose urinary symptoms have not responded to medication or less invasive procedures. These men generally have confirmed BPH without known prostate cancer. The operation aims to restore normal urine flow and eliminate the constant need to urinate, strain, or wake up multiple times at night.

Radical prostatectomy is a cancer operation. It is offered to men with localized prostate cancer, meaning the disease has not spread beyond the prostate or its immediate surroundings. The intent is curative: get all the cancer out and give the patient the best chance of long-term survival. When men with localized prostate cancer use decision aids to weigh their options, the most common reason they choose radical prostatectomy over alternatives like radiation or active surveillance is that they value physically removing the tumor. In one study using a preference-sensitive decision tool, about nine in ten men who chose surgery cited tumor removal as their primary motivator.¹

Surgical Approaches and the Role of Robotics

Both simple and radical prostatectomy can be performed as open surgery, as conventional laparoscopic surgery, or with robotic assistance. The robotic approach has become dominant in many countries for both procedures, though the shift happened earlier and more completely for radical prostatectomy.

For radical prostatectomy, a large study from Taiwan comparing open, laparoscopic, and robot-assisted techniques found that the robot-assisted approach led to significantly lower odds of needing a blood transfusion: only about 7% of robotic patients required one, compared with roughly 13% for laparoscopic and 24% for open surgery.² A separate comparison found that robotic radical prostatectomy patients lost an average of about 190 mL of blood during surgery, versus roughly 660 mL for open retropubic radical prostatectomy.³

For simple prostatectomy, robotic and open approaches achieve comparable improvements in urinary symptoms and flow rates. A direct comparison found that both methods yielded similar postoperative improvements in symptom scores, flow measurements, and residual urine, with neither technique clearly outperforming the other in functional terms.⁴ Newer single-port robotic platforms have also been studied for both procedures. A systematic review found that single-port robotic radical prostatectomy produced outcomes similar to multi-port robotic radical prostatectomy in operative time, complication rates, continence, and potency, with a slightly shorter hospital stay. For simple prostatectomy, single-port robotic surgery showed shorter hospital stays and lower rates of new-onset urinary incontinence compared with other techniques.⁵

Urinary Continence After Each Procedure

One of the biggest differences between simple and radical prostatectomy is the impact on urinary control. Because a radical prostatectomy removes the entire prostate and requires reconnecting the urethra to the bladder, stress urinary incontinence is a well-known and feared side effect. Most men experience some leakage in the weeks to months after surgery, and while the majority regain good control over time, a meaningful percentage have long-term incontinence that requires management. For those who do develop persistent incontinence, treatments like artificial urinary sphincters and sling procedures can help. A systematic review of surgical treatments for post-radical-prostatectomy incontinence found that the artificial urinary sphincter achieved continence (defined as needing zero or one safety pad) in about 66% of patients, while various sling procedures achieved it in roughly 48% to 49%.⁶

Simple prostatectomy carries a lower risk of lasting incontinence because the external urinary sphincter and the prostate capsule remain intact. Temporary urgency and leakage during healing are common, but persistent stress incontinence is relatively rare. That said, the early postoperative weeks can still be uncomfortable, and robotic simple prostatectomy data show that symptom scores improve steadily over the first three months, then plateau and hold steady for up to three years.⁷

Sexual Function and Quality of Life

Sexual function is affected by both procedures, but the magnitude differs substantially. Radical prostatectomy directly threatens the neurovascular bundles that run along the prostate and control erections. Even with nerve-sparing techniques, which were pioneered in the 1980s to reduce this damage, many men experience erectile dysfunction afterward.⁸ A meta-analysis of quality-of-life data found that sexual function declined significantly after radical prostatectomy, even as overall quality of life showed modest improvement by the one-year mark. Emotional well-being improved substantially, but urinary symptoms, social functioning, and pain did not change meaningfully on average.⁹ That same analysis found that the quality-of-life improvement at one year reached statistical significance only for men who had laparoscopic or robotic surgery, not for those who had open surgery.

Simple prostatectomy poses less risk to erections because the surgeon works inside the prostate capsule and generally stays away from the neurovascular bundles. Erectile function is not guaranteed to be unaffected, and some men do notice changes, but the risk profile is milder than with radical prostatectomy. Meanwhile, the relief from severe urinary symptoms often produces a dramatic improvement in how men feel day to day.

Bladder Neck Contracture and Other Complications

Both operations can cause a narrowing where the bladder connects to the urethra, called a bladder neck contracture. This is a scarring problem that can restrict urine flow months after surgery. In radical prostatectomy, where the urethra is sewn directly to the bladder, a study of 930 robotic radical prostatectomy patients found a contracture rate of about 1.6%, diagnosed on average around five and a half months after surgery.¹⁰ The rate is generally lower with robotic techniques than with open surgery, likely because of better visualization and more precise suturing.

For simple prostatectomy, the bladder neck is opened during surgery to access the adenoma, and the healing process can occasionally produce contracture as well. Other complications shared between the two procedures include bleeding, infection, and urinary tract infections during the catheter period. The key difference in the complication profiles comes back to the scope of the surgery: radical prostatectomy involves deeper dissection, lymph node removal, and urethral reconstruction, all of which add layers of risk that simple prostatectomy avoids.

The Incidental Cancer Problem

Here is where the boundary between these two operations gets genuinely interesting. Simple prostatectomy is performed for BPH, but the tissue removed sometimes contains cancer that was not detected beforehand. A multi-institutional study of patients undergoing single-port robotic simple prostatectomy found that about 4.6% of patients had incidental prostate cancer in the final pathology report. The overall rate of clinically significant cancer was around 2%. Most cases were low-grade, and those patients were managed with active surveillance. One patient with a higher-grade tumor went on to have a radical prostatectomy afterward with good results.¹¹

A separate series reported an even higher rate: in 34 patients undergoing a modified simple prostatectomy designed to remove the entire prostate rather than just the adenoma, half turned out to have prostate cancer on final pathology.¹² That study specifically selected patients suspected of harboring both BPH and cancer, so its 50% rate reflects a deliberately high-risk population rather than a typical simple prostatectomy cohort. Still, the finding underscores why thorough preoperative cancer screening matters before performing a simple prostatectomy and why some surgeons have developed modified techniques that remove more tissue as a precaution.

Positive Surgical Margins in Radical Prostatectomy

For radical prostatectomy, the oncologic question is not whether cancer is found, since it is already known, but whether the surgeon got all of it. When a pathologist examines the removed prostate and finds cancer cells at the cut edge, that is called a positive surgical margin. Positive margins increase the risk of the cancer coming back and of needing additional treatment like radiation.¹³ The most common location for a positive margin is the apex of the prostate, which is the part closest to the external sphincter, followed by the posterolateral edge.¹⁴

Not all positive margins carry the same weight. A meta-analysis found that the length of the margin matters: margins longer than 3 mm were associated with roughly double the risk of biochemical recurrence compared with margins shorter than 3 mm.¹⁵ This is useful information because a tiny margin at the apex of a low-grade tumor carries a very different prognosis than an extensive margin from a high-grade cancer. The decision about whether to pursue salvage radiation after a positive margin typically involves weighing the margin’s size, location, and the grade of the tumor.

Holmium Laser Enucleation as an Alternative to Simple Prostatectomy

Men facing a simple prostatectomy for a very large prostate increasingly have another option: holmium laser enucleation of the prostate, usually called HoLEP. This endoscopic procedure achieves essentially the same anatomical goal, removing the obstructing adenoma, but does it through the urethra using a laser rather than through an abdominal incision or robotic ports.

A meta-analysis comparing HoLEP with robotic simple prostatectomy found that the two approaches produce equivalent functional outcomes in terms of maximum urinary flow rate and residual urine volume. But HoLEP had significant advantages in operational efficiency: it cut operative time by about 49 minutes, hospital stays by about a day and a half, and catheter duration by nearly four days. HoLEP also reduced the risk of needing a blood transfusion by about 75%. The trade-off was that robotic simple prostatectomy patients were less likely to experience higher-grade complications, though robotic patients had higher complication rates overall, with roughly 1.9 times the risk of moderate complications and 3.4 times the risk of more severe ones.¹⁶

A Korean comparison study told a slightly more nuanced story on continence. While HoLEP patients went home much sooner, with an average stay of about 2.5 days versus 7 days for robotic simple prostatectomy, the robotic group had lower incontinence rates at one and two months after surgery.¹⁷ A separate multi-center comparison found that a composite outcome combining symptom relief, continence, and flow rate was achieved in 56% of robotic simple prostatectomy patients versus 33% of HoLEP patients, with the surgical approach being an independent predictor of that composite success rate.¹⁸ So the choice between HoLEP and robotic simple prostatectomy involves balancing a faster recovery and shorter hospitalization against potentially better early continence.

Pelvic Floor Rehabilitation After Either Procedure

Regardless of which prostatectomy a man undergoes, pelvic floor muscle training has become a standard part of recovery. The muscles that support continence take a hit during any prostate surgery, and structured rehabilitation helps men regain control faster. This is especially important after radical prostatectomy, where the sphincter mechanism bears the entire burden of continence without the prostate’s contribution.

Pelvic floor rehabilitation programs typically begin before surgery, with men learning to identify and contract the right muscles while they are still continent. Postoperative training then ramps up after the catheter is removed. The evidence suggests that men who start with worse baseline continence tend to see the largest improvements from structured therapy, which makes sense: those with the most room to improve have the most to gain.¹⁹ For men with mild early leakage, the exercises still help, but the incremental benefit over natural recovery is smaller.

Why the Two Are Sometimes Confused

Part of the confusion between these procedures stems from the fact that the same organ is involved and the names are frustratingly similar. Another factor is that preoperative workups sometimes overlap. A man being evaluated for BPH surgery may undergo a biopsy or MRI that reveals cancer, shifting the conversation from simple to radical prostatectomy. Conversely, a man who undergoes a simple prostatectomy for BPH may end up with cancer found incidentally in the removed tissue, as described above, which can then require a second surgery.

The conditions themselves also coexist. BPH and prostate cancer both become more common with age, they can occur in different zones of the same gland, and having one does not protect against the other. A man with a 150-gram prostate causing severe urinary obstruction might also have a small focus of low-grade cancer that a standard biopsy missed. This overlap is the reason surgeons take cancer screening seriously before committing to a simple prostatectomy, and why some researchers have explored modified techniques that remove more tissue than a standard simple prostatectomy would.

For practical purposes, the distinction matters most at the point of treatment planning. If you are told you need a prostatectomy, the single most important question is whether the goal is to treat cancer or to relieve urinary obstruction from BPH. That answer determines not just the type of surgery but the extent of tissue removal, the risk profile for continence and sexual function, the follow-up monitoring schedule, and whether additional treatments like radiation might enter the picture later.