Robotic Posterior Urethroplasty
Robotic-assisted posterior urethroplasty (RPU) is an evolving alternative to the traditional perineal or transpubic abdominoperineal approach for recalcitrant posterior urethral obstruction. The AUA 2023 urethral stricture guideline amendment issues a Conditional Recommendation (Grade C) that surgeons may perform robotic or open reconstruction for recalcitrant bladder-neck contracture or post-prostatectomy vesicourethral anastomotic stenosis (VUAS).[1]
For the canonical PFUI workflow, see Pelvic Fracture Urethral Injury (PFUI). For the open posterior gold-standard repair, see Excision and Primary Anastomosis and Core-Through Urethrotomy. For the broader VUAS / BNC framework, see Bladder Neck Reconstruction & VUAS. For the fully transurethral BMG alternative, see Endoscopic Urethroplasty.
Indications
RPU is primarily indicated for posterior obstruction that has failed endoscopic management (median 2–3 prior failed dilations / DVIU / bladder-neck incision before robotic reconstruction).[2][3] Etiology distribution in the largest series (Zhang 2023, n = 105):[4]
- Post-prostatectomy VUAS — most frequent (~ 48%).
- Bladder-neck contracture after endoscopic prostate procedures (BPH treatment) — ~ 24%.
- Radiation-induced posterior urethral stenosis — ~ 24%.
- Pelvic fracture urethral injury — less common in robotic series.
Surgical Approaches
The technique is tailored to location and complexity of the stenosis:[3][4][5][6]
| Approach | Use |
|---|---|
| Transabdominal (intra- or extraperitoneal) | Standard robotic dock for deep pelvic dissection; transvesical access; cystoscopy defines stricture extent |
| Combined robotic transabdominal + open transperineal | Required in ~ 39% of cases (Zhang 2023, Cavallo 2021), particularly for complex or obliterative strictures |
| Robotic-assisted perineal (Buckley) | Robot used selectively for proximal suture placement during a standard perineal dissection; ~ 15 min set-up + 30–45 min suture phase |
| Single-port robotic | Supraumbilical access for intraabdominal or extraperitoneal transvesical reconstruction; described with BMG augmentation by Liu / Shakir / Zhao |
Reconstructive techniques employed (Zhang 2023 distribution)[4]
| Technique | Share |
|---|---|
| Excision and primary anastomosis | 30% |
| Resitting of the bladder neck | 24.8% |
| Y-V plasty | 20% |
| Buccal mucosa graft (BMG) urethroplasty | 13.3% |
Ancillary procedures
Frequently combined: gracilis muscle flap interposition (~ 33% in some series), rectus abdominis flap, omental flap, and concurrent prostatectomy (66.7% in one combined-approach series).[3][5]
Advantages of the Robotic Platform
- Superior visualization — magnified 3D optics in the deep pelvis where open visualization is limited.[6][7]
- Improved ergonomics — particularly useful with narrow pelvic anatomy and long perineal-skin-to-proximal-urethra distances.[6]
- Reduced blood loss — 100 vs 200 mL vs open perineal (p = 0.001).[8]
- Shorter hospital stay — 1–2 days vs 3–4 days open (p = 0.001).[2][8]
- Lower de novo incontinence in one comparative cohort — 16.6% vs 100% in the open arm (p = 0.031, Savun 2025).[8]
- Adjunctive procedures simultaneously — concurrent prostatectomy, flap harvest, tissue transfer.[5]
Outcomes
| Series | n | Approach | Success | AUS rate | ≥ Clavien III complications | Follow-up |
|---|---|---|---|---|---|---|
| Zhang 2023[4] | 105 | Robotic (39% combined) | 75.2% (no reintervention) | 28.6% | 6.7% | 18.7 mo |
| Bearrick 2022[2] | 21 | Robotic | 80–100% (by etiology) | 0–80% (by etiology) | 0–40% (by etiology) | — |
| Cavallo 2021[5] | 12 | Combined robotic + perineal | 83.3% | 75% | — | 596 days |
| Liu 2022[3] | 9 | Single-port robotic + BMG | — | — | 0% intraop | 11.7 mo |
| Savun 2025[8] | 10 (robotic) vs 18 (open) | Robotic vs open perineal | 80% vs 77.8% | — | Comparable | — |
The AUA 2023 amendment cites robotic-assisted reconstruction patency rates of 72.7–75%.[1]
Impact of Etiology — the Radiation Signal
Outcomes are strongly stratified by etiology, with prior pelvic radiation the dominant predictor of poor functional outcomes (Bearrick 2022):[2]
| Etiology | Anatomic success | Functional success | Reintervention | AUS placement |
|---|---|---|---|---|
| Post-BPH treatment | 100% | 100% | — | 0% |
| Post-prostatectomy (non-radiated) | 90% | 100% | — | 30% |
| Radiation-associated | 80% | 60% | 80% | 80% (p = 0.013) |
Prior pelvic radiation and preoperative incontinence are the strongest predictors of patency failure and poor functional outcomes.[2][8]
Complications
- 30-day Clavien ≥ III complications: 6.7% in Zhang 2023.[4]
- Wound abscess 16.7%, urinary leak 8.3%, thromboembolism 8.3% in Cavallo 2021.[5]
- Stress urinary incontinence is the dominant functional concern — 28.6–75% of patients ultimately require AUS placement, depending on series and etiology.[4][5]
- Erectile dysfunction ~ 16.7% in one series.[5]
- Operative time — median 150 minutes for straightforward cases; up to 377 minutes for complex BMG reconstructions with flap harvest.[3][8]
Current Evidence Limitations
- Evidence base is retrospective single-center or small multi-institutional series; no RCTs vs open.
- Follow-up is short to intermediate (median ~ 12–19 months).
- AUA 2023 assigns Grade C to the recommendation for robotic reconstruction.[1]
- Patient selection is heterogeneous; experience is concentrated at a small number of high-volume centers with significant reconstructive expertise.[7]
Videos
References
1. Wessells H, Morey A, Souter L, Rahimi L, Vanni A. Urethral stricture disease guideline amendment (2023). J Urol. 2023;210(1):64-71. doi:10.1097/JU.0000000000003482.
2. Bearrick EN, Findlay BL, Maciejko LA, et al. Robotic urethral reconstruction outcomes in men with posterior urethral stenosis. Urology. 2022;161:118-124. doi:10.1016/j.urology.2021.11.035.
3. Liu W, Shakir N, Zhao LC. Single-port robotic posterior urethroplasty using buccal mucosa grafts: technique and outcomes. Urology. 2022;159:214-221. doi:10.1016/j.urology.2021.07.049.
4. Zhang TR, Alford A, Wang A, Zhao LC. Robotic-assisted posterior urethroplasty: outcomes from 105 men in a single-center experience. Urology. 2023;181:167-173. doi:10.1016/j.urology.2023.05.062.
5. Cavallo JA, Vanni AJ, Dy GW, et al. Clinical outcomes of a combined robotic, transabdominal, and open transperineal approach for anastomotic posterior urethroplasty. J Endourol. 2021;35(9):1372-1377. doi:10.1089/end.2020.0973.
6. Unterberg SH, Patel SH, Fuller TW, Buckley JC. Robotic-assisted proximal perineal urethroplasty: improving visualization and ergonomics. Urology. 2019;125:230-233. doi:10.1016/j.urology.2018.11.011.
7. Kim S, Buckley JC. Robotic lower urinary tract reconstruction. Urol Clin North Am. 2021;48(1):103-112. doi:10.1016/j.ucl.2020.09.006.
8. Savun M, Çolakoğlu Y, Özdemir H, et al. Comparison of open perineal and robot-assisted reconstruction in vesicourethral anastomotic stenosis. World J Urol. 2025;43(1):413. doi:10.1007/s00345-025-05808-w.