Emergency Medicine Hub / Trauma & Orthopedics • 3 min read • 3 sections

Genitourinary Trauma: Renal, Bladder, Urethral & Penile Injuries

Evidence-based emergency management of blunt and penetrating genitourinary trauma: AAST renal injury grading, intraperitoneal vs. extraperitoneal bladder rupture, anterior vs. posterior urethral disruption, retrograde urethrogram (RUG) indications, and acute penile fracture repair.

Resuscitation Quick Actions • First 2 Minutes

High-Acuity

Urethral Injury Triad

Blood at urethral meatus, perineal/scrotal hematoma (butterfly hematoma bounded by Colles fascia), and high-riding/boggy prostate on rectal exam.

Mandatory Initial Step

Retrograde Urethrogram (RUG). Inject 20-30 mL of water-soluble contrast through a clamp-assisted catheter tip; obtain oblique pelvis radiograph. If extravasation seen -> Urethral disruption confirmed; place suprapubic cystostomy.

Bladder Rupture Differentiation

Intraperitoneal (dome of bladder tears from high intravesical pressure; gross hematuria + peritonitis; REQUIRES SURGERY) vs Extraperitoneal (associated with pelvic fracture pubic rami; managed with large-bore Foley drainage x 10-14 days).

Renal Trauma Grading (AAST)

Grade I (subcapsular hematoma) to Grade V (shattered kidney or avulsion of renal pedicle). Grade I-IV managed conservatively if hemodynamically stable; Grade V mandates emergent operative revascularization/nephrectomy.

Penile Fracture (Surgical Emergency)

Rupture of tunica albuginea and corpus cavernosum during intercourse. Auditory snap, sudden detumescence, severe pain, and marked hematoma with lateral curvature ('eggplant deformity'). Immediate urologic exploration and primary repair within 24 hours to prevent erectile dysfunction.

Bottom-Line Clinical Pearl

NEVER insert a Foley catheter in trauma patients with signs of urethral injury (blood at the urethral meatus, perineal/scrotal hematoma, high-riding prostate, or pelvic fracture) until a normal Retrograde Urethrogram (RUG) is confirmed. Intraperitoneal bladder rupture requires MANDATORY emergency laparotomy and surgical repair.

ABSOLUTE CONTRAINDICATION: Blind Foley Catheter Placement in Pelvic Trauma

Attempting blind urethral catheterization in the presence of a partial urethral tear can convert it into a complete urethral transection, create false passages into the retropubic space, and introduce severe perivesical infection. If blood is present at the meatus or severe pelvic fracture is identified, perform a Retrograde Urethrogram (RUG) first or place a percutaneous suprapubic cystostomy tube under ultrasound guidance.

Bladder Rupture: Intraperitoneal vs. Extraperitoneal

Feature	Intraperitoneal Bladder Rupture	Extraperitoneal Bladder Rupture (80% of Cases)
Anatomic Site	Bladder dome (thinnest, covered by peritoneum)	Anterolateral bladder wall below peritoneal reflection
Mechanism	Direct blunt force to distended/full bladder (e.g. seatbelt trauma, MVC)	Shearing forces or bony spicules from pelvic ring/pubic rami fractures
Clinical Signs	Gross hematuria, lower abdominal peritonitis, inability to void, rising BUN/Cr from peritoneal autodialysis of reabsorbed urine	Gross or microscopic hematuria, suprapubic tenderness/swelling, pelvic instability
CT Cystogram Finding	Contrast outlines bowel loops, fills paracolic gutters, and collects under diaphragm	Flame-shaped contrast extravasation confined to space of Retzius and pelvic soft tissue
Definitive Management	Mandatory Emergency Laparotomy with two-layer surgical closure of bladder wall	Non-operative: Large-bore (20-24 Fr) urethral Foley catheter drainage for 10-14 days; repeat cystogram before removal

Anterior vs. Posterior Urethral Disruption

Posterior Urethral Injury (Prostatomembranous): Occurs almost exclusively with high-energy pelvic ring fractures (shearing forces at the fixed urogenital diaphragm). Exam reveals high-riding prostate, inability to void, and blood at meatus. Managed by suprapubic tube placement; delayed elective primary realignment or urethroplasty at 3-6 months.
Anterior Urethral Injury (Bulbous/Pendulous): Results from straddle injury (bicycle crossbar, manhole cover, direct kick) or penile trauma. Extravasated blood and urine are confined by Buck's fascia (limited to penile shaft) or if Buck's fascia is ruptured, extravasates beneath Colles' fascia into the scrotum, perineum, and lower abdominal wall, sparing the thighs ('butterfly hematoma').

Genitourinary Trauma Pitfalls

Relying on standard CT abdomen/pelvis without CT cystography: A routine venous-phase IV contrast CT abdomen/pelvis misses up to 50% of bladder ruptures; bladder rupture MUST be evaluated by retrograde instillation of >= 300-350 mL of contrast into the bladder under gravity (CT cystogram).
Delaying exploration for penile fracture: Conservative ice and dressing management carries a 40% complication rate of permanent penile curvature, chordee, and erectile dysfunction; emergent surgical repair has a >90% success rate.

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