Post-traumatic posterior urethral distraction after pelvic fracture
A 26-year-old man was in a motorcycle crash 3 months ago and sustained a pelvic fracture. At the time of injury he had blood at the meatus and a failed urethral catheterization, so a suprapubic catheter was placed. He now has a suprapubic tube and is unable to void. Retrograde urethrography shows a 2.5 cm distraction at the bulbomembranous junction, with contrast reaching the bladder and an intact bladder neck. There is no extravasation. He reports reduced erections since the accident. He asks whether the tube can be removed and whether surgery will restore normal urination and sexual function.
1. What imaging and timing are needed before repair, and why should repeated urethral catheterization or dilation be avoided?
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Before repair, define the anatomy with a retrograde urethrogram and a voiding cystourethrogram or cystogram through the suprapubic tube. This confirms the length of the distraction, the status of the bladder neck, and whether there is a false passage or bladder injury. At 3 months after pelvic fracture, the hematoma has usually resolved and the distraction is stable; definitive repair is generally delayed 3–6 months.
Repeated urethral catheterization or blind dilation is harmful in an established posterior urethral distraction. It can create a false passage, worsen the defect, introduce infection, and convert a straightforward anastomosis into a complex reconstruction. The suprapubic tube should remain for drainage. Endoscopic realignment has a role in selected acute injuries, not in a mature 2.5 cm distraction.
2. What operation would you recommend, and what are the main risks?
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I would recommend perineal posterior urethroplasty with excision of the scar and a tension-free mucosa-to-mucosa anastomosis. For a 2.5 cm bulbomembranous distraction with an intact bladder neck, this approach has a success rate of roughly 85–90%. The patient is positioned in the exaggerated lithotomy position, the scar is excised, and the bulbar urethra is anastomosed to the prostatic apex. If the defect is longer than expected or the bladder neck is involved, additional maneuvers such as pubectomy or a graft may be needed.
Risks include stricture recurrence, erectile dysfunction, urinary incontinence, bleeding, infection, and thromboembolic events. Incontinence is uncommon when the bladder neck is competent. A voiding trial is performed after an appropriate period of suprapubic drainage, with imaging if voiding is poor.
3. How do you counsel him about erectile dysfunction and incontinence, and what would you do if the repair failed?
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Counsel him that erectile dysfunction is common after pelvic fracture urethral injury and may be caused by the initial vascular or nerve trauma rather than by the surgery. Repair may improve function in some men but does not guarantee it. Offer PDE5 inhibitors when he is ready, and mention vacuum devices or penile prosthesis for refractory cases. Incontinence is unlikely with a competent bladder neck, but if it occurs after repair, evaluate sphincter function and consider an artificial urinary sphincter.
If the anastomosis fails, avoid repeated internal urethrotomy or dilation, which rarely cures obliterative post-traumatic strictures and can worsen the defect. Re-evaluate with retrograde and voiding studies and perform repeat urethroplasty, often with graft augmentation if the defect is long. He should be followed with uroflowmetry and symptom assessment.