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Difficulty: MediumUrologic Surgery

A 34-year-old man is brought to the emergency department after a high-speed motorcycle collision. He is hemodynamically stable, and a primary trauma survey reveals no acute intracranial, thoracic, or abdominal life-threatening injuries. Pelvic radiography demonstrates a displaced fracture of the pubic rami. On physical examination, there is prominent blood at the urethral meatus, a severely swollen and ecchymotic scrotum, and the patient reports a strong urge to void but is unable to do so. Digital rectal examination reveals a high-riding, boggy prostate. Arrange the following steps in the most appropriate chronological sequence for the standard diagnostic and surgical management of this patient's urologic injury.

  1. 1Perform retrograde urethrography (RUG)
  2. 2Place a suprapubic cystostomy tube
  3. 3Delay further intervention for 3 to 6 months
  4. 4Perform formal anastomotic urethroplasty

Answer

The correct chronological sequence is: 1) Perform retrograde urethrography (RUG), 2) Place a suprapubic cystostomy tube, 3) Delay further intervention for 3 to 6 months, and 4) Perform formal anastomotic urethroplasty.
The correct management sequence for a suspected posterior urethral injury in the setting of pelvic trauma requires a careful, staged approach. First, the presence of blood at the urethral meatus and a high-riding prostate strictly contraindicates blind urethral catheterization. Therefore, retrograde urethrography (RUG) must be performed to visualize the extent of the urethral disruption. Once a complete transection is confirmed, immediate urinary diversion is required, which is accomplished via the placement of a suprapubic cystostomy tube. Immediate definitive surgical repair is contraindicated because the acute pelvic hematoma and friable tissues obscure anatomical planes, making surgery extremely hazardous and highly associated with postoperative incontinence and erectile dysfunction. Instead, a delay of 3 to 6 months is observed to allow the hematoma to reabsorb and the injury to stabilize into a defined stricture. Finally, a delayed formal anastomotic urethroplasty is performed to definitively restore continuity to the urinary tract.

Step-by-Step Solution

1
Recognize signs of posterior urethral injury.
The patient has a pelvic fracture, blood at the urethral meatus, an inability to void, and a high-riding prostate.
These findings are highly specific for a posterior urethral disruption, typically at the membranous urethra.
2
Determine the initial diagnostic test.
Retrograde urethrography (RUG) must be performed first.
Blind urethral catheterization is strictly contraindicated in this setting, as it can worsen a partial tear into a complete transection.
3
Establish safe urinary drainage.
Placement of a suprapubic cystostomy tube.
Because the urethra is disrupted, urine must be diverted directly from the bladder through the abdominal wall to prevent urinary extravasation and relieve retention.
4
Plan the timeline for definitive surgical repair.
Delay surgery for 3 to 6 months, followed by an anastomotic urethroplasty.
Immediate open reconstruction carries an unacceptably high risk of severe hemorrhage, erectile dysfunction, and incontinence due to the obscured tissue planes from the acute pelvic hematoma.

Key Concept

Management of Posterior Urethral Disruption
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Topics

Urologic Surgery

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