In order to have an accurate discussion on sexual function after surgery one must look at many factors:
Age of the patient.
Sexual Health of Patient prior to surgery.
Surgeon experience/expertise.
Rehab process.
Extent of cancer
location of cancer
When looking at statistics, one must separate results in older men from those in younger men and results from 10-15 years ago vis-a-vis results gathered in the last 5 years.
I think that the overall statistic saying that 50% of men who undergo surgery is probably roughly correct. However, this includes the many men in their 60s-70s who would have had diminishing results already because of their age, men who had surgeries more than a decade ago when the technique was far form refined, and men who were/are unfortunate enough to be what amounts to training for inexperienced surgeons. So I think it is probably very misleading to tell a young guy 40-55 who is sexually healthy heading into surgery, and who has selected an experienced surgeon in a good center that he will have a 50% chance of losing his ability to have an erection. The overall statistic is misleading for many men. Just as it would be misleading to tell a 68 year old with pre existing ED issues that he will not have any post surgical issues with regards to ED.
"Sexual Function After Surgery
Many men worry about
whether surgery for BPH will affect their ability to enjoy sex. Some sources state that sexual function is rarely affected, while others claim that it can cause problems in up to 30 percent of cases. However, most doctors say that even though it takes awhile for sexual function to return fully, with time, most men are able to enjoy sex again.
Complete recovery of sexual function may take up to 1 year, lagging behind a person's general recovery. The exact length of time depends on how long after symptoms appeared that BPH surgery was done and on the type of surgery. Following is a summary of how surgery is likely to affect the following aspects of sexual function.
Erections
Most doctors agree that if you were able to maintain an erection shortly before surgery, you will probably be able to have erections afterward. Surgery rarely causes a loss of erectile function. However, surgery cannot usually restore function that was lost before the operation."
kidney.niddk.nih.gov/kudiseases/pubs/prostateenlargement/#sexual"Columbia Urology's researchers found that up to 93% of men with normal erections before surgery were having sexual intercourse by one year after the operation."
columbiaurology.org/specialties/roboticsurgery/robotic-prostatectomy.html"Outcomes from robotic series are at least as good, if not better than those reported for
open prostatectomy. Our data has shown that among preoperatively potent men aged less than 65 who underwent a nerve-sparing procedure, 89.7% were able to have satisfactory erections at 24 months.
Patel reported 78% of men were potent at 12 months following RARP (Table 1)."
www.urology.uci.edu/prostate/Potency_info.html"Of patients with no pre-existing erectile dysfunction who underwent Dr. Menon's nerve-sparing robotic radical prostatectomy, over 90 percent eventually had return of erectile function."
www.drmanimenon.com/preserving-erectile-function/"# 96% of patients regain continence*
# 85% of patients regain sexual function*"
www.roboticoncology.com/"A notable study in 2005 showed that a year after surgery, 97 percent of patients were able to achieve an erection adequate for intercourse. But last month, researchers from George Washington University and New York University reviewed interim data from their own study showing that fewer than half of the men who had surgery felt their sex lives had returned to normal within a year.
So which of the studies is right? Surprisingly, they both are. "
"If a patient has good sexual function without erection-enhancing drugs before surgery, Dr. Tewari tells him that he has about
an 85 percent chance of regaining an erection firm enough for intercourse, although he may need erection drugs and it may take up to 18 months for his function to return. "
"Men who are older or who used erection drugs before surgery have a more difficult recovery. "
www.nytimes.com/2008/01/15/health/15well.html