Important Clarification: BPH Surgery vs. Prostate Cancer Surgery
The evidence provided addresses prostate cancer surgery (radical prostatectomy), not BPH surgery. These are fundamentally different procedures with different nerve-sparing outcomes.
For BPH Surgery (What You Asked About):
Nerve-sparing is not a standard concept in BPH surgery because the neurovascular bundles are typically not at risk during endoscopic BPH procedures. 1 The primary sexual concern with BPH surgery is ejaculatory dysfunction (retrograde ejaculation), not erectile dysfunction from nerve damage.
Sexual Function Outcomes After BPH Surgery:
Erectile dysfunction rates after standard BPH surgery (TURP) are approximately 10%, but this is generally not due to nerve injury—it's multifactorial and often related to pre-existing conditions 1. The 2003 AUA BPH Guidelines report:
- Ejaculatory problems: 65% (primarily retrograde ejaculation)
- Erectile dysfunction: 10%
- These rates apply to TURP, the historical gold standard 1
Modern Minimally Invasive BPH Techniques:
Recent evidence shows ejaculation-sparing BPH techniques preserve antegrade ejaculation in significantly more patients (OR 15.11) compared to conventional surgery, while maintaining comparable erectile function 2.
Specific ED rates for newer BPH procedures:
- Water vapor thermal therapy (Rezūm): 1% ED at 36 months, with no de novo ED reported 3
- TUNA: 6.8% ED at 10 years 4
- TUMT: 1% ED at 5 years 4
For Prostate Cancer Surgery (Radical Prostatectomy):
If you meant prostate cancer surgery, the data is completely different:
After bilateral nerve-sparing radical prostatectomy, approximately 72% of men retain erectile function (defined as erections sufficient for intercourse with or without PDE5 inhibitors) 5. However, this varies dramatically by:
- Age <50 years: 86% potency
- Age 50-59 years: 76% potency
- Age 60-69 years: 58% potency
- Age ≥70 years: 37% potency 5
Unilateral nerve-sparing achieves only 53% overall potency 5.
Critical Caveats:
The older guidelines 6 report ED rates of 60-90% after prostate cancer surgery, but these include non-nerve-sparing procedures and predate modern techniques and PDE5 inhibitors. The most recent high-quality study 5 from 2008 with 1,620 consecutive patients provides the most reliable contemporary data.
Bottom line: Specify whether you're asking about BPH or prostate cancer surgery—the answers are entirely different. For BPH, ED is uncommon (~10%) and not primarily nerve-related. For prostate cancer with bilateral nerve-sparing, ~72% retain function overall, but age is the dominant predictor.