Genitourinary trauma

• Genitourinary trauma is managed as part of overall trauma care: secure the airway, breathing and circulation first, then stage each organ injury.
• The kidneys are the most commonly injured genitourinary organ; renal trauma makes up to 5% of trauma cases and most of it (grades 1 to 3, and many grade 4 to 5 injuries) is treated without surgery. ^[1]
• Haematuria (visible or invisible) raises suspicion but is unreliable: major renal or ureteric injuries can occur without haematuria.
• Intraperitoneal bladder rupture (usually the bladder dome) must be repaired surgically; uncomplicated extraperitoneal bladder rupture is treated with catheter drainage.
• Pelvic fracture urethral injuries are managed with urinary diversion first; definitive repair is deferred; a retrograde urethrogram is the standard early test for male urethral injury.
• Penile fracture and testicular rupture are surgical emergencies: close the tunica albuginea; early exploration saves the testis.

By the end of this page you should be able to:

1. Explain how renal injuries are graded and why haemodynamic stability, not grade alone, dictates operative versus non-operative care.
2. Describe selective angioembolisation, ureteric stenting and repeat imaging in renal trauma. ^[1]
3. Recognise ureteric injury and know the golden rules of immediate and delayed repair.
4. Differentiate intraperitoneal and extraperitoneal bladder rupture and manage each appropriately.
5. Perform and interpret a retrograde urethrogram, and outline management of anterior and posterior urethral injuries.
6. Recognise penile fracture and testicular rupture and arrange prompt repair.

Genitourinary trauma is injury to the kidneys, ureters, bladder, urethra or external genitalia from blunt, penetrating, iatrogenic or (rarely) sexual mechanisms. These organs are well protected and isolated genitourinary injuries are uncommon, but they matter because the urologist is the only person who can preserve urinary and sexual function while the trauma team controls bleeding. In polytrauma the genitourinary injury is almost never the first priority: life-threatening bleeding, head and chest injuries and pelvic instability come first. Damage-control principles apply, so complex reconstruction waits until the patient is warm, coagulated and perfused.

This page follows the 2026 European Association of Urology (EAU) Guidelines on Urological Trauma^[1] and the 2014 American Urological Association (AUA) Urotrauma Guideline (amended 2017 and 2020)^[2]. Where the two differ, both positions are stated. Numbers, thresholds and recommendations are those published in those documents.

Trauma is classified by intent (intentional versus unintentional) and by mechanism. Blunt injury crushes or shears the kidney or bladder; penetrating injury (stab, gunshot, fragments, impalement) divides tissue directly and is less predictable. Velocity of the projectile (low, medium, high) determines how far damage extends beyond the wound track. Blast injury mixes blunt and penetrating elements with burns.

The most widely used anatomic scoring system for urologic organs is the American Association for the Surgery of Trauma (AAST) injury scale, which is most useful for the kidneys. Other organs are described by anatomic site and whether the injury is partial or complete. "High-grade" renal trauma means AAST grades 4 and 5; these injuries carry more morbidity and more often need intervention, but even they are increasingly managed without surgery in stable patients.

Renal trauma is present in up to 5% of all trauma cases, is most common in young males, and has an overall population incidence of 4.9 per 100,000. Bladder injury occurs in about 1.6% of blunt abdominal trauma victims and is extraperitoneal in about 60%, intraperitoneal in about 30%, and both in the remainder. Ureteric trauma is rare (1 to 2.5% of urinary tract trauma) and is mostly iatrogenic. Posterior urethral injury occurs in up to 25% of male pelvic fractures. Genital trauma accounts for 33 to 66% of urological injuries and is much more common in males aged 15 to 40 years, most often blunt (about 80%). Around 33 to 66% of all urological injuries involve the genitalia. ^[1][2]

• Renal: high-velocity road traffic accidents, falls, sporting injuries and assault; sudden deceleration can avulse the vascular pedicle or the ureteropelvic junction. Penetrating stab or gunshot injuries, more common in urban settings, tend to be more severe.
• Ureteric: most injuries are iatrogenic during gynaecological, colorectal or urological surgery (lower ureter); risk rises with altered anatomy (prior surgery, inflammation, malignancy, endometriosis, retroperitoneal fibrosis). External trauma from penetrating abdominal injury and deceleration is uncommon. Iatrogenic urethral injury during catheterisation occurs at 6.2 to 13.4 per 1,000 catheters inserted. ^[1]
• Bladder: blunt injury (road traffic accidents, falls, blows to the lower abdomen) in 60 to 90% of cases is accompanied by pelvic fracture; alcohol intoxication raises risk in motor vehicle collisions. Iatrogenic injury occurs mainly during gynaecological, urological or general surgery. ^[1]
• Urethral: blunt posterior injuries are almost always pelvic fracture urethral injuries (PFUI); motor vehicle crashes (68 to 84%) and falls from height (6 to 25%) predominate. Anterior bulbar injuries are straddle injuries; about 15% of penile fractures involve the urethra. ^[1]
• Genital: sports, off-road cycling, assault; sexual intercourse accidents, including penile fracture.

Renal injuries are usually staged on the trauma protocol CT scanner before the urologist is involved. Predictors of renal injury include a direct blow to the flank or rapid deceleration. Pre-existing renal abnormality (hydronephrosis, a solitary kidney, urolithiasis) makes injury more likely. Physical findings include flank bruising, stab or bullet wounds, abdominal tenderness and rib fractures. Urinalysis, haematocrit and baseline creatinine are taken. Haematuria (visible or non-visible) is a key finding, but major injuries (ureteropelvic disruption, pedicle injuries, segmental arterial thrombosis, stab wounds) may occur without haematuria. Visible haematuria out of proportion to trauma suggests underlying disease. Urine dipstick testing for haematuria has a 3 to 10% false-negative rate. ^[1]

Imaging is indicated when there is visible haematuria; non-visible haematuria with an episode of hypotension; rapid deceleration or significant associated injuries; penetrating trauma; or clinical signs suggesting renal trauma (flank pain or mass, abrasions, fractured ribs, abdominal distension, tenderness). CT is the imaging modality of choice: it grades the injury, documents the contralateral kidney and shows associated injuries. The ideal protocol is three-phase (arterial, nephrographic, delayed at about five minutes), although delayed phase imaging is unreliable in hypovolaemic patients and is often omitted from whole-body trauma protocols. ^[1]

Advance one grade for bilateral injuries up to grade 3. The radiology AAST scale was revised in 2018, but the 2026 EAU guidelines note that the newer scale does not outperform the older grading in predicting bleeding and need for intervention.

Haemodynamic stability is the primary criterion for management. Most renal injuries are now managed non-operatively: bed rest, serial blood tests, regular observation and reimaging. Grades 1 to 3 are managed non-operatively. Grade 4 injuries are mostly treated conservatively, but with a higher rate of later intervention. Persisting urinary extravasation from an otherwise viable blunt injury usually responds to ureteric stent placement and/or percutaneous drainage. Grade 5 injuries often present unstable and need exploration, but selected stable patients (lower transfusion requirements, smaller haematomas, less severe lacerations) can be managed expectantly; over 50% of grade 5 injuries confirmed on CT can be managed non-operatively in such selected patients. Unilateral main arterial injury or arterial thrombosis is normally managed non-operatively in stable patients; surgical repair is reserved for bilateral injury or injury to a solitary functioning kidney. High-grade non-operative management (including selective angioembolisation) is successful in up to 94.9% of grade 3, 89% of grade 4 and 76% of grade 5 blunt injuries. ^[1]

Selective angioembolisation has a key role in stable patients. Accepted CT findings indicating need for it are active contrast extravasation, arteriovenous fistula and pseudoaneurysm; active extravasation plus a perirenal haematoma more than 25 mm deep predict need for embolisation well. It protects renal function and, compared with surgical repair, reduces nephrectomy rates for high-grade blunt and penetrating injuries. Repeat embolisation prevents nephrectomy in 67% of patients; open surgery after failed embolisation usually results in nephrectomy. Penetrating injuries can also be selected for non-operative care when stable: up to about 50% of stab wounds and 40% of gunshot wounds are successfully managed non-operatively, although gunshot wounds and high-grade injuries fail more often. ^[1]

Ureteric stenting for an asymptomatic stable grade 4 collecting-system injury has no clear benefit: stenting, nephrostomy or perirenal drainage is reserved for persistent or symptomatic urinary leak. Urethral catheterisation is unnecessary in stable low-grade injury; it is used for heavy haematuria that needs monitoring or stenting, and is removed once haematuria lightens and the patient improves.

Repeat CT is recommended for high-grade and penetrating injuries, and whenever there is fever, worsening flank pain or a falling haematocrit, two to four days after trauma. It can be omitted for grades 1 to 3 if the patient remains well. Catheter drainage is not used prophylactically for simple renal injuries.

Lack of response (or only transient response) to fluid resuscitation is a strong indication for exploration. A blood lactate of at least 4 mmol/L with inadequate response to resuscitation predicts nephrectomy. Other indications are concomitant abdominal injuries needing laparotomy, an expanding or pulsatile perirenal haematoma, haemodynamically unstable grade 5 vascular injuries, and failed non-operative management. The overall exploration rate for blunt trauma is low; renal reconstruction is attempted when bleeding is controlled and there is enough viable parenchyma. A transperitoneal approach with vascular control is standard; nephrectomy is required in about 30% of explorations (up to 85% when Gerota's fascia zone II is opened). High-velocity gunshot injuries usually need nephrectomy. Hypertension is rare after renal trauma; it may occur as a "Page kidney" from external compression or from renal artery thrombosis or stenosis, and is treated medically or by excision, vascular reconstruction or nephrectomy if it persists. ^[1][2]

Complications include bleeding, infection, abscess, fistula, urinary extravasation, urinoma, hypertension, arteriovenous fistula and pseudoaneurysm. Duplication is avoided by reimaging only when needed: high-grade and penetrating injuries are reassessed. Follow-up at about three months includes urinalysis, individualised imaging (nuclear scintigraphy, CT or ultrasound), blood pressure and renal function tests, with annual blood pressure monitoring thereafter. ^[1]

Ureteric injury is uncommon in external trauma and is missed unless specifically looked for (iatrogenic injuries often present days later with fever, flank pain, urinary leakage from a drain, ileus or uraemia). Haematuria is present in only 50 to 75% of cases and is unreliable. CT urography is the examination of choice; extravasation of contrast on delayed images is the hallmark, but hydronephrosis, ascites, urinoma or mild ureteric dilatation may be the only signs. In unclear cases, retrograde or antegrade ureterography is the best confirmation. ^[1]

Management depends on timing, location and severity. If recognised during operation, a ligation injury needs deligation and stenting; partial injuries can be stented (antegrade, retrograde or rendezvous); complete injuries need a spatulated end-to-end anastomosis or reimplantation. In unstable patients a damage-control approach (ligate, divert with nephrostomy, repair later) is preferred. For delayed diagnosis, endourological stenting (with or without dilatation) succeeds in 14 to 19% of cases, and if it fails, open, laparoscopic or robot-assisted repair is done. ^[1]

Length matters: injuries shorter than 2 to 3 cm in the proximal and mid ureter are managed by ureteroureterostomy; longer gaps in the distal ureter need reimplantation (ureteroneocystostomy) with a psoas hitch or Boari flap. Extensive loss may need ileal interposition or autotransplantation, or buccal mucosa ureteroplasty (success about 90%, limited experience). Late diagnosis with failed repairs leads to stricture in up to 38% of patients. Principles of repair: debride, spatulate, watertight tension-free mucosa-to-mucosa anastomosis with absorbable sutures, stent internally and drain externally, cover with omentum or peritoneum. Upper ureteric stricture surgery is generally deferred, not done in acute trauma. ^[1]

Bladder trauma is classified by whether the rupture is intraperitoneal (usually the bladder dome, from sudden pressure in a distended bladder or penetrating trauma), extraperitoneal (usually anterolateral/bladder base shear or bony puncture, almost always with pelvic fracture) or combined (5 to 8% of cases). ^[1]

Important facts:

• Most bladder injuries (60 to 90%) occur with pelvic fracture, but bladder injury complicates only about 3% of pelvic fractures (up to 26.5% in severe pelvic disruption). ^[1]
• Bladder injury is associated with urethral injury in 5 to 20% of cases. ^[1]
• Visible haematuria is the principal sign. Absolute indications for imaging are visible haematuria plus pelvic fracture, or non-visible haematuria with a high-risk pelvic fracture (displacement more than 1 cm or pubic symphysis diastasis more than 1 cm) or posterior urethral injury. ^[1]
• Cystography (plain or CT) is the diagnostic modality, with comparable sensitivity of 90 to 95% and specificity of 100%. CT cystography is preferred when bone fragments, bladder neck or other abdominal injuries must be assessed. It must use retrograde filling with at least 300 to 350 mL of dilute contrast; passive filling by clamping a catheter during the excretory phase is insufficient. ^[1]
• Intraperitoneal extravasation appears as free contrast outlining bowel and viscera; extraperitoneal injury as flame-shaped peri-vesical contrast; contrast in the vagina suggests vesicovaginal fistula. Cystoscopy is the preferred method for detecting intraoperative injuries.
• Extraperitoneal injury: conservative treatment (observation plus continuous bladder drainage) is standard for uncomplicated blunt or iatrogenic rupture; penetrating extraperitoneal injuries should only be managed this way if minor and isolated. Bladder neck involvement, bone fragments in the bladder wall, combined rectal or vaginal injury or entrapment of the bladder wall mandate surgery, particularly when the pelvis is fixed internally.
• Intraperitoneal injury: always surgically repaired (open or laparoscopic) in blunt/penetrating non-iatrogenic trauma, because intraperitoneal urine leads to peritonitis, sepsis and (rarely) death. Uncomplicated iatrogenic intraperitoneal perforation after endourology can be managed conservatively in the absence of peritonitis or ileus, with peritoneal drainage if the lesion is larger. Closure uses absorbable sutures; there is no evidence that two-layer closure beats single-layer watertight closure.
• Follow-up drainage: 5 to 10 days after operative repair of a simple injury in a healthy patient without cystography; 5 to 7 days after conservative treatment of internal iatrogenic perforation. For traumatic or external iatrogenic extraperitoneal injuries, cystography is done first at about 10 days; complex injuries (trigone or ureteric reimplantation) or impaired healing risk factors also get cystography, with a second study a week later if leakage persists. ^[1]

Urethral injury is divided by site (anterior versus posterior) and by sex. Anterior (bulbar and penile) injuries are usually blunt straddle injuries or penetrating trauma. Posterior (membranous/prostatic) injuries are pelvic fracture urethral injuries (PFUI): motor vehicle crashes and falls predominate, and the urethra may be partially or completely disrupted. Males bear almost all PFUI; the mechanism is a stretched urethra sheared by the displaced prostate.

Clinical signs: blood at the meatus is the cardinal sign but may be absent; inability to void with a palpable distended bladder suggests complete rupture; perineal, penile or scrotal swelling and ecchymosis; difficulty passing a catheter. Rectal examination is mandatory to exclude associated rectal injury (up to 5% of PFUI) and may find a high-riding prostate (unreliable). Associated injuries occur in up to 66% of PFUI and dominate resuscitation. ^[1]

Retrograde urethrography (RUG) is the standard early test for male urethral injury. It is performed by injecting 20 to 30 mL of contrast material while occluding the meatus, with images taken in a 30-degree oblique position (in PFUI the X-ray beam is tilted, not the patient). Any extravasation outside the urethra is pathognomonic. RUG reliably locates anterior versus posterior injury but cannot reliably distinguish complete from partial rupture; before deferred repair, a combined RUG plus antegrade cystourethrogram assesses position, gap and bladder neck competence. RUG should be postponed in unstable patients. Flexible cystourethroscopy is an alternative that can distinguish complete from partial rupture. In females, urethrography is impractical; cystourethroscopy and vaginoscopy are preferred. ^[1]

Management principles:

• In PFUI, urinary diversion has priority only after life-threatening injuries are controlled; there is no need to catheterise in the first hours, but early diversion (suprapubic or urethral, ultrasound-guided if needed) monitors output and limits extravasation.
• Partial posterior injuries need only catheter drainage and often heal without significant scarring.
• Complete posterior disruptions managed with suprapubic diversion alone almost always obliterate; deferred urethroplasty after at least three months remains the standard. Early endoscopic realignment (catheter across the disruption under vision with fluoroscopy) is an option in stable patients; strictures after it can sometimes be treated endoscopically, but evidence that realignment improves outcome over diversion alone is conflicting. Immediate urethroplasty within 48 hours is not recommended (high bleeding, stricture, incontinence and erectile dysfunction); early urethroplasty (2 days to 6 weeks) is an option in selected stable patients with a short gap and soft perineum.
• Suprapubic diversion with deferred urethroplasty for male PFUI has an 86% stricture-free success rate, with no significant adverse effect on erectile function or continence. ^[1]
• Erectile dysfunction occurs in about 34% of patients after PFUI regardless of treatment; earlier studies attributed complications to treatment rather than injury itself, but more recent evidence assigns them to the underlying injury. ^[1]
• Female PFUI: early repair (within 7 days) carries the lowest complication rate; early realignment and delayed repair perform worse. Concomitant vaginal lacerations are repaired at the same time. Stricture rates after early repair (3%), early realignment (59%) and delayed repair (3%) illustrate the advantage of early repair; incontinence is substantially higher after delayed repair (31%) than after early repair (9%). ^[1]
• Anterior injuries: penetrating and straddle blunt injuries are treated according to depth. Small lacerations can be closed, complete ruptures anastomosed. Immediate repair is indicated for injuries associated with penile fracture and for non-life-threatening penetrating injuries; only 2% develop stricture after immediate reconstruction for penile fracture. Blunt anterior injuries are often managed first with diversion (suprapubic or trial of early endoscopic realignment) because spongiosal contusion makes debridement margins uncertain; urinary diversion is maintained 1 to 2 weeks for partial and 3 weeks for complete ruptures. Iatrogenic and penetrating life-threatening injuries need diversion; minor contusions need no diversion. Minor catheter injuries do not require diversion. ^[1]

Penile fracture is rupture of the cavernosal tunica albuginea, most often during sexual intercourse (about 60% of cases), with reported mechanism also including forced flexion, masturbation and rolling over. The erect penis is vulnerable because tunica albuginea thins from about 2 mm in the flaccid state to 0.25 to 0.5 mm in erection. Substance abuse is associated. Incidence of concomitant urethral injury is 10 to 22%. ^[1]

Presentation is classic: a sudden cracking or popping sound, pain, immediate detumescence and rapid shaft swelling and ecchymosis; sometimes a palpable defect. Bleeding spreads along fascial planes to the lower abdominal wall if Buck's fascia is also ruptured. "False" penile fracture (subcutaneous haematoma without tunical rupture) should not be operated on unnecessarily: absence of a cracking sound, slow detumescence, penile deviation and shaft ecchymosis are sensitive signs for false fracture.

Diagnosis is clinical; in equivocal cases ultrasound, cavernosography or contrast-enhanced MRI identify tunical laceration (MRI is superior to ultrasound). Evaluate for urethral injury when there is blood at the meatus, gross haematuria or inability to void; intraoperative flexible cystoscopy can exclude it during exploration.

Management: prompt surgical exploration and closure of the tunica albuginea is recommended by AUA (standard) and EAU. An absorbable suture closure is used; a circumferential subcoronal degloving incision or local longitudinal/ventral approach gives exposure. An EAU-reviewed systematic review advises repair within 24 hours, but delayed presentation should still be explored. Immediate repair ensures the lowest rate of long-term sequelae; conservative management increases complications (penile abscess, missed urethral disruption, curvature, persistent haematoma and delayed infection) and late fibrosis/angulation in about 35% and erectile dysfunction in up to 62% of patients. Postoperative complications occur in up to 20%; postoperative erectile dysfunction is more common over age 50 years or with bilateral corporal involvement; plaque/nodule formation 13.9%, curvature 2.8%, erectile dysfunction 1.9%. ^[1]

Blunt scrotal trauma ruptures the testis in approximately 50% of cases presenting for evaluation; rupture occurs under intense compression of the testis against the pubic ramus or symphysis, requiring a force of about 50 kg. Bilateral blunt injuries occur in 1% of blunt genital trauma versus 30% of penetrating scrotal injuries. ^[1]

Presentation: immediate pain, nausea, vomiting, sometimes syncope; tender, swollen, ecchymotic hemiscrotum; the testis may be hard to palpate. Ultrasound is the recommended imaging and may show heterogeneous echo pattern with loss of contour definition (sensitive and specific for rupture), though some literature reports poor sensitivity (28%) and specificity (78%) for differentiating rupture from haematocele; colour Doppler helps assess perfusion. If inconclusive, CT or MRI may help but does not specifically increase detection rates. ^[1]

Management: a patient with any signs suggestive of testicular rupture must be explored. Surgery entails evacuation of haematoma and clots, excision of non-viable tubules and closure of the tunica albuginea with absorbable sutures. Early exploration preserves the testis in more than 90% of cases; delayed surgery leads to orchiectomy in 45 to 55%. Large haematoceles (more than three times the size of the contralateral testis) should be evacuated surgically even if the testis is intact, because non-operative management often fails and causes prolonged stay. Small haematoceles (under three times contralateral size) can be managed conservatively. ^[1]

Penetrating scrotal injuries require exploration and debridement, repair or orchiectomy if non-salvageable, given the high (over 50%) rate of testicular injury and limited ultrasound sensitivity. Blunt scrotal ultrasound (AUA recommendation) is recommended for most patients with physical findings suggestive of rupture. Testicular dislocation is reduced manually with later orchidopexy, or operated primarily if closed reduction fails; bilateral dislocation occurs in up to 25% of cases. ^[1]

• Advanced trauma life support (ATLS) principles govern the whole patient. Tetanus status is checked for penetrating wounds.
• Damage control: temporise (temporary drainage, gauze packing) rather than perform definitive reconstruction in the exsanguinating patient.
• Urological victims are best managed in major trauma centres; networks reduce mortality by 25% and length of stay by four days. ^[1]
• Thromboprophylaxis and bed rest: isolated renal trauma carries low risk of secondary haemorrhage, so strict bed rest has waned for patients able to mobilise; established measures (compression stockings, low molecular weight heparin) reduce thrombosis. No evidence that prophylaxis reduces pulmonary embolism or mortality.
• Antibiotics: prolonged use is common with urinary extravasation; there is no evidence base, so follow local antimicrobial policy.
• Catheters: prolonged for all bladder and urethral injuries; not needed for stable low-grade renal injury; keep duration as short as possible.

• Females: urethral injuries are rare and almost exclusively PFUI; early repair (within 7 days) has the lowest complication rate.
• Penetrating scrotal trauma in conflict settings often follows improvised explosive devices; military testicular salvage rates have risen to about 67.6% with improvements in surgical services. ^[1]
• Low-resource settings: an enhanced trauma CT protocol is not always available; when CT is unavailable, one-shot intravenous pyelography or intravenous urography is a poor substitute (up to 60% false negative for ureteric injury). A transthoracic ultrasound and clinical staging can at least guide referral. Up to 60% of bladder ruptures are extraperitoneal and can be managed with a catheter if imaging and follow-up cystography are possible. Where interventional radiology is absent, renal bleeding is managed surgically. ^[1]

Discuss urgently with urology (and trauma surgery) for: any haemodynamically significant renal trauma; grade 4 to 5 injuries with vascular involvement; an expanding perirenal haematoma; extraperitoneal bladder injury needing surgery (bladder neck/rectal involvement, bone fragments, entrapment); any intraperitoneal bladder rupture; PFUI; suspected testicular rupture; penile fracture; and any genital skin loss requiring complex reconstruction. Urotrauma is mostly managed within trauma networks, but reconstruction is planned at a centre that can do delayed urethroplasty.

• When CT with delayed phases is unavailable, one-shot urography or ultrasound-guided catheterisation is all that may be possible; refer early.
• Extraperitoneal bladder injuries can be managed with catheter drainage in austere settings if follow-up cystography is available.
• Testicular rupture and penile fracture require operating-theatre access; if unavailable, arrange transfer rather than observation.
• Where interventional radiology is absent, high-grade renal bleeding is controlled surgically; a damage-control nephrectomy may be life-saving.

None are linked yet on MedGrasp for this topic. Neighbouring trauma subjects (abdominal solid-organ injury, thoracic trauma) are covered under their own entries.