Ureterorrhaphy refers to the surgical suturing or repair of the ureter, the narrow muscular tube that carries urine from each kidney to the bladder. The term is most often used in the context of repairing a ureter that has been cut, crushed, or otherwise damaged, whether from external trauma or as an accidental complication of abdominal or pelvic surgery. Because the ureter sits deep in the body and runs close to organs that gynecologists, colorectal surgeons, and vascular surgeons routinely operate on, surgical injury to it is the most common reason a ureterorrhaphy or related reconstruction becomes necessary. The specifics of the repair depend heavily on where the damage occurs along the ureter’s length and how much tissue has been lost.
Why Ureteral Injuries Happen
The vast majority of ureteral injuries are iatrogenic, meaning they occur during a surgical procedure rather than from an accident or violence. The ureter is only about 25 to 30 centimeters long and just a few millimeters wide, and it runs along the back wall of the abdomen before crossing into the pelvis near structures that surgeons frequently need to access. In one series of 4,000 abdominal procedures, 84 ureteral injuries were recorded, putting the rate at roughly 2%. About three-quarters of those injuries happened during gynecological operations and about one-quarter during general surgery.1PubMed Central. Ureteral injury during abdominal and pelvic surgery: immediate versus deferred repair Hysterectomy is the single most common culprit among gynecologic procedures, followed by cesarean section.2PubMed Central. Iatrogenic Ureteral Injuries Associated with Gynecological and Surgical Procedures: Our Experience About 18 Cases and Literature Review
The ureter’s vulnerability comes down to anatomy. In the pelvis it crosses beneath the uterine artery and passes within a centimeter or two of the cervix. During a hysterectomy, the surgeon must clamp and divide the uterine blood supply very close to this crossing point. An energy device, a misplaced suture, or even retraction can damage the ureter. Colorectal surgery, aortic aneurysm repair, and ureteroscopic stone procedures each carry their own patterns of risk, but gynecologic surgery consistently accounts for the largest share of cases.
Why Catching It Early Matters
Some ureteral injuries are noticed right away on the operating table, while others go unrecognized for days or even weeks. The difference in outcomes is stark. Delayed recognition of an iatrogenic ureteral injury more than doubled the odds of developing hydronephrosis or stricture within one year and nearly tripled the odds of kidney impairment within two years, compared with injuries caught immediately.3PubMed. Impact of Delayed Recognition of Iatrogenic Ureteral Injury in a Retrospective Population-Based Study When the injury is missed, urine leaks into the surrounding tissue, causing inflammation, scarring, and sometimes the formation of a fistula, an abnormal connection between the ureter and another structure such as the vagina.
Suspicion usually arises when a patient develops flank pain, unexplained fever, rising creatinine levels, or visible fluid drainage from a surgical wound or the vagina in the days after surgery. Imaging with CT urography or retrograde pyelography can confirm the diagnosis. Intravenous urography has historically been the most frequently used diagnostic method for ureteral and renal trauma.4PubMed. Renal and ureteric trauma: diagnosis and management in Poland In current practice, CT with contrast has largely supplanted older techniques, though retrograde pyelography remains valuable when detailed anatomy of the injury site is needed before planning a repair.
Core Surgical Principles
Regardless of the specific technique chosen, every ureteral repair follows the same set of guiding principles. The anastomosis, meaning the reconnection point, must be tension-free, watertight, and widely spatulated, which means slitting the ends of the ureter open so the joined surfaces are broad rather than narrow. Absorbable sutures are used so that permanent suture material does not act as a nidus for stone formation. And the blood supply to the remaining ureter must be carefully preserved, because the ureter depends on a delicate network of small arteries running along its wall.5Urologic Clinics of North America. Ureteral Reconstruction Violating any one of these principles raises the risk of stricture, a scarred narrowing that can obstruct the kidney all over again.
In most repairs a ureteral stent, a thin flexible tube threaded through the ureter from the kidney to the bladder, is left in place temporarily to keep the channel open while healing occurs. A surgical drain is typically placed nearby as well. The stent is usually removed weeks later in a brief outpatient procedure.
How Location Dictates the Repair
The ureter is roughly divided into three zones: proximal (near the kidney), mid, and distal (near the bladder). Where the injury falls determines which reconstruction technique gives the best results.
- Distal injuries: These are the most common, because they occur near the pelvic structures that gynecologic and colorectal surgeons work around. The standard repair is ureteroneocystostomy, which means detaching the damaged segment and reimplanting the healthy end of the ureter directly into the bladder. When more length is needed, the bladder can be hitched up to the psoas muscle to close the gap.
- Mid-ureteral injuries: A direct end-to-end repair, ureteroureterostomy, is often feasible here. This is the procedure that most closely matches the strict meaning of “ureterorrhaphy,” since the two freshened ends of the ureter are sutured together after any devitalized tissue has been trimmed away.
- Proximal injuries: These can sometimes be managed with ureteroureterostomy as well, but if significant length has been lost, options include a Boari flap (a tongue of bladder wall fashioned into a tube to bridge the gap), transureteroureterostomy (connecting the injured ureter to the opposite healthy ureter), or in extreme cases renal autotransplantation, where the kidney is moved to the pelvis and plugged into the iliac vessels so that a shorter ureteral connection becomes possible.
This injury-location algorithm has been validated across multiple reviews and remains the backbone of decision-making in ureteral reconstruction.6PubMed Central. Management of iatrogenic ureteral injury Additional options for complex or recurrent strictures include appendiceal onlay flaps, buccal mucosa graft ureteroplasty, and ileal ureteral replacement, in which a segment of small bowel substitutes for the lost ureter.7PubMed. Robotic Repair of Ureteral Strictures: Techniques and Review
When a Simple Stent Is Enough
Not every ureteral injury requires open surgical repair. Minor injuries, particularly partial transections or small thermal burns recognized very early, can sometimes be managed by placing a double-J ureteral stent endoscopically. In one series of gynecologic-surgery patients with distal ureteral injuries, stent placement alone allowed the injury site to heal without leakage, as confirmed by imaging performed every three months during follow-up.8PubMed. Outcomes of ureteroscopic double-J ureteral stenting for distal ureteral injury after gynecologic surgery Similarly, in a series of ureterovaginal fistulas managed initially with endoscopic stent placement, about two-thirds healed without further intervention, though about a third went on to need open reimplantation.9PubMed Central. Ureterovaginal fistulas: The role of endoscopy and a percutaneous approach The takeaway is that stent-only management works for selected injuries, but it is not a universal fix, and the more extensive the damage, the more likely a formal reconstruction will be needed.
Robotic and Minimally Invasive Approaches
For decades, ureteral reconstruction meant open surgery through a large abdominal incision. Over the past fifteen years, robot-assisted laparoscopic approaches have expanded rapidly. The robot’s articulating instruments and magnified three-dimensional view are well suited to the precise, fine suturing that ureteral repair demands.
Outcomes from multi-institutional data are encouraging. In a study pooling cases from four tertiary care centers, robot-assisted ureteroureterostomy required no conversions to open surgery, and the overall success rate for both ureteroureterostomy and pyeloplasty exceeded 90% at a median follow-up of two years. Intraoperative complications were essentially absent, and the high-grade complication rate was just over 2%.10PubMed. Robot-assisted Surgery for Benign Ureteral Strictures: Experience and Outcomes from Four Tertiary Care Institutions A comparative study of robotic versus open repair for recurrent ureteral strictures found that the robotic group had shorter operative times (roughly 125 minutes versus 185) and less blood loss, with similar success rates in the mid-80% range for both groups.11PeerJ. Management of recurrent ureteral stricture: a retrospectively comparative study with robot-assisted laparoscopic surgery versus open approach
A separate comparison of robot-assisted and open reconstruction specifically for iatrogenic injuries found that the robotic approach was associated with less blood loss, shorter hospital stays, and a lower treatment failure rate: none of the 19 robotic cases failed, compared with 7 of 36 open cases.12PubMed Central. Outcomes and treatment failure after open or robotic ureteral reconstruction for iatrogenic injuries These are small numbers, and the differences could reflect patient selection as much as surgical technique, but they fit a consistent pattern: robotic reconstruction appears at least as effective as open surgery, with faster recovery.
Seeing Blood Flow in Real Time
One of the trickiest judgment calls during ureteral repair is deciding where to trim. The surgeon needs to cut back to tissue with a good blood supply, but under normal white light the ureter can look healthy on the outside even when its blood flow has been compromised by cautery or traction. Indocyanine green (ICG) fluorescence imaging addresses this problem. After injecting a small amount of ICG dye intravenously, the surgeon switches the camera to a near-infrared mode that lights up perfused tissue in bright green while poorly perfused areas stay dark.
In a pediatric robotic case series, ICG fluorescence confirmed adequate perfusion proximal and distal to the reconstruction within 60 seconds of dye administration, helping the surgical team verify that the tissue being sutured together was well vascularized.13Journal of Pediatric Surgery Case Reports. Indocyanine green (ICG) assessment of ureteral perfusion during pediatric robotic surgery In kidney-transplant recipients, ICG videography showed 100% sensitivity for detecting poorly perfused ureteral segments, with an overall accuracy above 93%. The average length of ureter that maintained good perfusion from the kidney end was about 14 centimeters.14PubMed Central. Intraoperative assessment of ureter perfusion after revascularization of transplanted kidneys using intravenous indocyanine green fluorescence imaging
Perhaps the most striking finding comes from a study of open ureteral reconstruction in adults. When surgeons compared their white-light assessment of the ureter to the ICG fluorescence picture, the two disagreed in about 61% of ureters. Use of the fluorescence imaging changed the surgical plan in 63% of cases, most commonly by prompting the surgeon to resect more ureter than they would have under white light alone (an average of 3.6 centimeters versus 1.8 centimeters). The change was even more pronounced in patients who had undergone prior radiation. At two-year follow-up, this ICG-guided approach was associated with low stricture rates.15PubMed. High Rates of Discordant Ureteral Perfusion During Open Ureteral Reconstruction With Indocyanine Green: Does Near-Infrared Fluorescence Imaging Change Management or Stricture Outcomes? The implication is sobering: the surgeon’s naked-eye judgment of tissue viability is wrong more often than it is right, and having an objective perfusion check can meaningfully improve outcomes.
Long-Term Kidney Function After Repair
The whole point of fixing a ureter is to protect the kidney above it. If urine cannot drain, the kidney swells, pressure builds, and over weeks to months the functional tissue slowly dies. One of the most reassuring findings in the literature is that kidney function tends to hold steady after successful reconstruction, even in patients who only have one working kidney. In a cohort of 61 solitary-kidney patients who underwent ureteral reconstruction, the estimated kidney filtration rate at the last follow-up was essentially unchanged from the preoperative baseline, and fewer than 5% met criteria for worsening kidney function.16PubMed Central. Renal function after ureteral reconstruction surgery in patients with solitary kidney
Even kidneys with poor function before reconstruction are worth trying to save. In a series of patients with poorly functioning kidneys who underwent ureteral repair, every patient had a successful outcome at a median follow-up of about four years, with no need for revision surgery or nephrectomy. Creatinine levels improved and remained stable, flank pain resolved in all affected patients, and one patient’s obstruction-related high blood pressure normalized after surgery.17Frontiers in Urology. Ureteral reconstruction is safe and successful in poorly functioning kidneys These results challenge the old instinct to simply remove a poorly draining kidney rather than attempt reconstruction.
What Recovery Looks Like for Patients
Ureteral problems before surgery are often accompanied by chronic flank pain, recurrent infections, and the ongoing burden of living with a nephrostomy tube or indwelling stent. The psychological toll is real. Studies using validated quality-of-life questionnaires show that patients awaiting ureteral reconstruction score significantly lower than the general population in physical functioning and bodily pain. After minimally invasive repair, scores across all measured domains improved significantly, and anxiety and depression scores also dropped.18PubMed. Clinical outcomes and health-related quality of life assessment following minimally invasive reconstructive surgery for benign ureteral strictures Successful surgery eliminates the need for long-term tubes and stents, which are uncomfortable and carry ongoing infection risk.
For patients who need the most extensive repair, ileal ureteral replacement using a segment of bowel, quality of life still improves substantially. A prospective multi-institutional study found that between roughly half and four-fifths of patients reported significant improvements across different quality-of-life domains at six months, and those gains were sustained at one year.19European Urology Open Science. Health-related Quality of Life in Patients Undergoing Ileal Ureter Replacement for Extensive Ureteral Stricture: A Prospective Multi-institutional Study Even when the procedure is complex, the payoff in daily life tends to be meaningful.
Ureteral Repair in Children
Pediatric ureteral injuries are uncommon but do occur, particularly during operations for congenital anomalies or, rarely, during abdominal trauma. A natural question is whether the adult repair techniques translate to smaller anatomy. The answer appears to be yes. In a reported pediatric series, children underwent ureteral reimplantation with psoas hitch and Boari flap using the same principles applied in adults, and at one year of follow-up none showed obstruction. One child who had lost 8 centimeters of proximal ureter went on to successful ileal ureteral replacement four years later.20PubMed. Iatrogenic ureteral injury: can adult repair techniques be used on children? Laparoscopic ureteroureterostomy has also been shown to be feasible and safe for mid-ureteral obstruction in children.21PubMed. Laparoscopic Resection and End-to-End Ureteroureterostomy for Midureteral Obstruction in Children
Children do have some advantages when it comes to ureteral healing. Their tissues are more elastic, their bladders are more compliant, and their capacity for tissue regeneration is robust. Still, pediatric ureteral injuries should be managed at centers with experience in both pediatric urology and reconstructive techniques, because the stakes of getting it wrong are high when the patient has decades of kidney function ahead of them.
Tissue Engineering and Lab-Grown Ureters
When a long segment of ureter is missing, surgeons currently replace it with the patient’s own tissue, most commonly a segment of small bowel. Bowel works, but it was never designed to transport urine. It secretes mucus, can absorb waste products back into the bloodstream, and occasionally develops metabolic complications. This has motivated a search for purpose-built biological grafts.
One line of research involves decellularizing ureters from pig donors, stripping out the cells while leaving the structural scaffolding of the extracellular matrix intact. These scaffolds can then be seeded with the patient’s own cells or implanted as-is to be repopulated by the body’s own cells over time. Laboratory work has demonstrated that crosslinked porcine ureteral scaffolds are biocompatible and may facilitate tissue remodeling, though this technology remains at a preclinical stage.22PubMed Central. Tissue Engineering of Ureteral Grafts: Preparation of Biocompatible Crosslinked Ureteral Scaffolds of Porcine Origin The practical appeal is obvious: an off-the-shelf ureteral graft that behaves like a ureter rather than like a piece of intestine would sidestep the metabolic complications of bowel interposition. Clinical trials in humans are still years away, but the concept is one of the more promising avenues in urologic tissue engineering.
Other experimental approaches include synthetic biodegradable polymer scaffolds and three-dimensional bioprinted constructs, though none have advanced past early animal models. For now, the clinical reality is that autologous tissue and conventional surgical ingenuity remain the standard, and they work well for most patients. The tissue-engineering work is best understood as a long-term investment toward solving the relatively uncommon but genuinely difficult problem of massive ureteral loss.