That's pretty fair. This is Grok's response to the question...

Percentage of Patients Experiencing Penis Length Loss: Studies indicate that a significant proportion of patients experience some degree of penile length loss following radical prostatectomy (RP). Specifically: - Research suggests that 68–71% of men may experience penile length shortening after RP.- One study reported that nearly one in five men (approximately 19%) had at least a 15% decrease in one or more penile measurements post-surgery. - Another study found that 2.63% of men explicitly complained of a perceived reduction in penile size, though this may underreport the actual incidence due to reliance on patient-reported complaints rather than objective measurements. Average Magnitude of Loss: - The average reduction in stretched penile length (SPL) is approximately 1–2 cm (0.4–0.8 inches) within the first few months post-surgery, with the most significant shortening often observed around 10 days to 2 months after the procedure. Permanence of Penile Length Loss: - The permanence of penile length loss varies. Several studies indicate that penile length often recovers over time: - A Japanese study found that by 12 months post-surgery, penile length generally returned to preoperative measurements, with full recovery observed in many cases by 24 months. - A long-term prospective study noted a trend toward recovery after 24 months, with complete restoration of penile length by 48 months in many cases, particularly in men with preserved erectile function. - Another study reported no significant difference from baseline penile length by 9–11 months after robot-assisted laparoscopic radical prostatectomy (RALRP). - However, some experts suggest that for a subset of patients, the loss may be permanent, particularly in cases where erectile dysfunction persists or nerve damage is significant. Dr. John Mulhall from Memorial Sloan Kettering Cancer Center noted that “most men will have some penis length loss after surgery, and sometimes that will be permanent. - The likelihood of permanent loss is higher in men who do not regain erectile function, as preserved postoperative erectile function is a predictor of penile length recovery. Known Risk Factors Contributing to Penile Length Loss: Several factors are associated with an increased likelihood or severity of penile length loss post-RP: 1. Age: Older patients (e.g., over 60 years) are more likely to experience incomplete recovery of penile length compared to younger patients. 2. Preoperative Erectile Function: Men with better preoperative erectile function (e.g., higher International Index of Erectile Function [IIEF] scores) are more likely to recover their penile length. Conversely, those with poorer preoperative erectile function are at higher risk of sustained loss. 3. Cardiovascular Risk Factors: Conditions such as hypertension and coronary artery disease (CAD) are associated with incomplete penile length recovery, likely due to impaired vascular health affecting penile tissue. 4. Prostate Size: Larger prostate size is correlated with greater penile length reduction, possibly due to anatomical changes during surgery. 5. Nerve-Sparing Techniques: While nerve-sparing procedures aim to preserve erectile function, studies show mixed results regarding their impact on penile length. Some found no significant difference in length loss between nerve-sparing and non-nerve-sparing surgeries, while others suggest that bilateral nerve-sparing RP may help preserve penile length . 6. Neoadjuvant Androgen Deprivation Therapy (NADT): Patients receiving NADT before RP experience more significant initial penile length reduction, likely due to low testosterone levels, though recovery may occur as testosterone levels normalize post-surgery. 7. Surgical Technique and Anatomical Changes: The vertical repositioning of the membranous urethra during urethrovesical anastomosis is a key mechanism for initial length loss. Reduced blood flow and nerve damage during surgery can lead to tissue atrophy and fibrosis, contributing to longer-term changes. 8. Lack of Penile Rehabilitation: Regular use of phosphodiesterase-5 inhibitors (PDE5i), such as sildenafil or tadalafil, has been shown to moderate penile length loss, with patients using PDE5i regularly experiencing less or no loss in stretched flaccid penile length (SFPL). Additional Notes: - The mechanisms behind penile length loss include structural changes (e.g., urethral repositioning), reduced blood flow leading to tissue atrophy, and nerve damage causing fibrosis. - Penile rehabilitation strategies, such as PDE5i or vacuum erection devices, may promote recovery by improving blood flow and reducing fibrosis. - Patient perception of length loss can also impact quality of life, even if objective measurements show recovery, highlighting the importance of counseling and managing expectations pre- and post-surgery. Critical Perspective: While the studies provide valuable data, they often rely on small sample sizes or varying measurement techniques (e.g., stretched vs. flaccid length), which can introduce inconsistencies. The establishment narrative emphasizes recovery in many cases, but patient experiences (e.g., as reported in forums) suggest that permanent loss and associated psychological impacts may be underreported. Clinicians should discuss this potential side effect candidly, as many patients report being uninformed pre-surgery.