Operative animation, Bladder rupture

Bladder rupture: pelvic fracture and the cystogram

Bladder rupture taught as two leaks on one organ: the peritonealised dome bursts upward into the peritoneal cavity, the bladder neck tears against the fractured pelvic ring into the pelvic haematoma.

A properly filled CT cystogram tells them apart, and an underfilled one hides both.

Core tier FRCS urological trauma, emergency urology Interactive 3D
Schematic scene preview: Bladder rupture
Preparing the 3D anatomy…

UrOops3D · UroRef · © Nity G

Click me next Section 2 of 8 Anatomy The structures this operation works between, and the one it must not cross.

The structures in the scene

Bladder rupture: how the structures relateMidline slice from the patient's right, the bladder inside a fractured pelvis. Bladder, distended for the cystogram: a tear here leaks into the peritoneal cavity Peritonealised dome (danger). Bladder, distended for the cystogram: lies on the pubic bones and their fractures Bladder neck against the ring (danger). Bladder neck against the ring: the tear tracks into it; it heals the tear Pelvic haematoma (danger). Peritonealised dome: runs across the dome; bowel lies above Peritoneal reflection and bowel. Bladder, distended for the cystogram: urethral drainage, suprapubic as the fallback The catheter corridor.Bladder, distended forthe cystogram!Peritonealised dome!Bladder neck againstthe ringPelvic haematomaPeritonealreflection and bowelThe cathetercorridora tear here leaksinto the peritonealcavitylies on the pubicbones and theirfracturesthe tear tracks into it;it heals the tearruns across the dome;bowel lies aboveurethral drainage,suprapubic as thefallbackTargetDangerLandmarkContext
Midline slice from the patient's right, the bladder inside a fractured pelvis. Schematic, not to scale; relationships only.
  • Stand at the patient's right and look at a midline slice.
  • Behind is the sacrum, in front the sprung pubic symphysis with its fracture fragments, and between them the bladder, with the prostate and urethra descending in front of the pelvis to the perineum.
  • Above the bladder the peritoneal reflection runs across the dome, and above that sit bowel loops: everything on the peritoneal side of that reflection is the intraperitoneal world, and a dome tear leaks into it.
  • Below and in front, the bladder neck lies naked against the pelvic bones and the fracture haematoma: an extraperitoneal tear leaks into that space instead.
  • The cystogram reads the two leaks by where the contrast goes, and the whole decision, catheter versus laparotomy, hangs on which side of the peritoneal reflection the tear sits.
  • ›Peritonealised dome - the part of the bladder under peritoneum; a tear here leaks urine straight into the peritoneal cavity.
  • ›Bladder neck against the ring - the extraperitoneal bladder wall, lying directly on the pubic bones and their fractures; the site of the leak into the haematoma.
  • ›Pelvic haematoma - the fracture haematoma surrounding the extraperitoneal bladder; it absorbs the leak, and it is the tissue that heals the tear.
  • ›Peritoneal reflection + bowel - the plane that separates the two rupture patterns and the reason intraperitoneal urine outlines bowel loops on imaging.
  • ›The catheter corridor - the urethral route for drainage and the suprapubic route as the fallback, both of which must be reconciled with orthopaedic metalwork.
Click me next Section 3 of 8 Steps The operation in order, with the landmark that guards each move.

Operative steps

  1. The mechanism Blunt deceleration or crush breaks the pelvic ring: the symphysis springs, the rami fracture, and the bony cage around the bladder changes shape. Two injuries follow from one force. The bladder neck, fixed against the bones, is torn where the ring displaces, and that leak drains into the pelvic haematoma. The dome, free and distended, bursts when compression squeezes it against a closed outlet, and that leak drains into the peritoneal cavity. One force, two leaks, in two different spaces.
    where it bites: the same pelvic fracture threatens both the bladder and the urethra: blood at the meatus changes the whole pathway.
  2. Assessment first The trauma survey comes before the urology: the sources of shock are found and addressed, and the bladder is studied once the patient is resuscitating rather than instead of resuscitation. Gross haematuria after pelvic trauma names the urinary tract for imaging, and the finding is pursued with the same seriousness as the fracture itself. The meatus is inspected and the prostate assessed on gentle rectal examination before anything is passed. The bladder diagnosis is made on imaging, never by catheterisation against resistance.
    where it bites: never force a catheter through blood at the meatus: the urethral injury must be excluded first.
  3. CT cystogram, properly filled Once the urethra is cleared, contrast is run retrograde into the bladder and the catheter is clamped so the organ fills to genuine distension before scanning. The filling is active and retrograde, not the passive arrival of excreted contrast, and the clamp stays on throughout. The reason is mechanical: an underfilled bladder collapses, its wall apposes and seals the tear, and the study reads falsely normal. A cystogram is only as good as the distension behind it.
    where it bites: the underfilled cystogram is a false-negative machine: an empty bladder wall apposes and seals the tear during scanning.
  4. Read the leak The pattern of extravasation names the leak. Contrast striping into the pelvic haematoma around the bladder neck and symphysis, contained below the peritoneal reflection, is extraperitoneal rupture. Contrast running free in the peritoneum, outlining bowel loops and pooling in the paracolic gutters, is intraperitoneal rupture from the dome. Both patterns answer one question: which side of the peritoneal reflection does the contrast sit? The answer decides catheter versus theatre.
    where it bites: contrast around bowel loops means intraperitoneal rupture and a laparotomy, not a catheter.
  5. Extraperitoneal: catheter drainage Extraperitoneal rupture is treated with a freely draining urethral catheter and nothing else in the great majority of patients. The haematoma around the tear both contains the leak and heals it, and the catheter keeps the bladder empty so the edges stay apposed. Drainage is checked constantly, because a catheter blocked by clot turns a healing tear into a leaking one. The catheter stays until a repeat study, again filled properly, shows a sealed bladder. Most of these patients never see a urological operation.
    where it bites: a blocked catheter converts conservative management into urgent surgery: check drainage constantly.
  6. Intraperitoneal: repair at laparotomy Intraperitoneal rupture goes to laparotomy, where the peritoneal cavity is lavaged and the dome tear is débrided of ragged edges before closure in two layers of absorbable suture. The interior of the bladder is inspected through the tear: the bladder neck is examined for an associated injury and the ureteric orifices are identified so that no injury is closed over unseen. The repair is drained by catheter, urethral or suprapubic as the injuries dictate, while it heals. A dome tear closed without inspecting the neck risks leaving the more dangerous injury behind.
    where it bites: a neck or ureteric injury found at laparotomy changes the operation: look before closing.
  7. Coordination with orthopaedics External fixator pins, bars and the planned orthopaedic approaches occupy the same few centimetres of lower abdominal wall as the suprapubic corridor, and the timing of packing or fixation changes every catheter plan. The urology plan, its route and its expected duration, is stated in the joint conversation before the metalwork goes on. If suprapubic drainage is needed later, the track is chosen clear of pin sites, under imaging where the anatomy is distorted, because a track driven past a pin seeds the metalwork. One joint plan, written into both sets of notes, made early.
    where it bites: a suprapubic track driven past fixator pin sites seeds the metalwork; plan the two incisions together.
Click me next Section 4 of 8 Danger zones Where this operation bites, and why it bites there.
Critical relationship

Danger zones

The spatial relationships the animation is built to make automatic. Before you read each one, ask yourself: at this point in the operation, what is about to go wrong, and what is my first move? The save for each sits in the Complications tab.

  • RiskThe underfilled cystogram - an empty or half-filled bladder seals its own tears during scanning; fill to genuine distension and clamp before scanning.
  • RiskThe dome under peritoneum - a leak here is urine into the peritoneal cavity: peritonitis by mechanism, and a laparotomy decision.
  • RiskThe neck against the fracture - tears here track into the pelvic haematoma; they also travel with urethral injuries and orthopaedic hardware.
Practise it Take me into the scene Opens the animation at a danger moment and asks you to predict the mechanism and your first move before it reveals.
Click me next Section 5 of 8 Complications The save for each one: the first move, the escalation trigger, the op-note line.

Complications and immediate saves

Trigger each of these live in the Animation tab, then read the save: the first move, the escalation trigger, and the line that goes in the op note.

Missed intraperitoneal leak

  • an underfilled or delayed cystogram reads normal while the dome tear keeps leaking; urine peritonitis, ileus and sepsis follow.
The save
  1. Recognise the missed leak: increasing abdominal pain, distension, ileus and systemic upset after a supposedly negative study. first move
  2. Resuscitate, bloods and cultures, and start antibiotics: this is chemical peritonitis progressing to sepsis.
  3. Re-image with a properly distended bladder: retrograde CT cystogram with the catheter clamped, filled to discomfort.
  4. A confirmed dome leak goes to laparotomy: lavage, two-layer absorbable repair and drainage.
  5. Peritonitis with deterioration, or a missed associated bowel injury → urgent laparotomy with general surgical support. escalation trigger
  6. Note: the technique and filling state of the first cystogram, the findings at re-imaging, and the repair performed. document

Catheter versus fixation conflict

  • the external fixator pins, bar and pin sites occupy the lower abdominal wall exactly where a suprapubic catheter or pelvic packing needs to go.
The save
  1. Anticipate it before the fixator goes on: state the catheter plan, urethral or suprapubic, in the joint conversation. first move
  2. If the urethra is intact, a urethral catheter avoids the conflict entirely and drains most extraperitoneal ruptures.
  3. When suprapubic access is unavoidable, choose a track clear of pin sites, under imaging where the anatomy is distorted.
  4. Never pass a suprapubic catheter through or beside a pin site: the track seeds the metalwork and the pin becomes the infection.
  5. Pressure necrosis of the bladder or skin under a bar, or an infected pin requiring revision → joint re-planning with orthopaedics. escalation trigger
  6. Note: catheter route, fixator configuration and the agreed sequence, in both the urology and orthopaedic notes. document

Infected pelvic haematoma

  • the fracture haematoma around an extraperitoneal tear is a culture medium once urine, catheters and metalwork cross it; it becomes an abscess.
The save
  1. Recognise it: persistent fever, a tender hostile pelvis and rising inflammatory markers after the injury has settled. first move
  2. Blood and urine cultures, then antibiotics: treat the patient, not the marker trend alone.
  3. Image with contrast CT: a collection needing drainage does not resolve on antibiotics.
  4. Drain radiologically where possible; the route is chosen to avoid bowel, fixator hardware and the bladder repair.
  5. A non-resolving collection, sepsis unresponsive to drainage, or necrotic tissue → operative drainage and débridement. escalation trigger
  6. Note: imaging findings, drainage route and microbiology, and the catheter plan during treatment. document
Click me next Section 6 of 8 Troubleshooting When the case turns: the problem, then the next move.

Intra-operative troubleshooting

When the case turns: the problem, then the next move.

  • ActionCystogram negative but the patient is peritonitic - the study may be underfilled: repeat with genuine distension; a peritonitic abdomen after pelvic trauma is explored rather than explained away.
  • ActionCatheter blocked by clot while draining a rupture - hand irrigation with a bladder syringe; if clot cannot be cleared and drainage stays obstructed, change the catheter over a guide or take the patient for washout.
  • ActionBladder neck injury found at laparotomy for a dome tear - convert the repair to include the neck: débride, close with absorbable sutures, and divert with catheter drainage; inspect the ureteric orifices before closing.
  • ActionFixator bar sits over the planned suprapubic site - agree a new track with orthopaedics, image-guided if needed; urethral drainage is the cleaner answer when the urethra is safe.
Click me next Section 7 of 8 FRCS viva Say it out loud, then mark yourself against the model answer.

FRCS viva questions

The examiner stems this scene prepares you for. Try to answer out loud first, then reveal, and learn the discriminator, the detail that turns a pass into a strong pass.

QHow do you perform and interpret a CT cystogram in suspected bladder rupture?reveal answer
  • The cystogram is only as good as the filling.
  • After the urethra has been cleared, or with a catheter already safely placed, contrast is instilled retrograde into the bladder under gravity, and the catheter is clamped so the bladder distends fully before scanning.
  • The reason is mechanical: a tear in an empty or barely filled bladder is apposed by the collapsing wall, and contrast can fail to extravasate, which is how underfilled studies produce false negatives.
  • The interpretation follows the contrast.
  • Extraperitoneal rupture shows contrast striping into the pelvic soft tissues around the bladder neck and symphysis, within the haematoma planes: it is managed conservatively with a freely draining catheter.
  • Intraperitoneal rupture shows contrast beyond the bladder outlining bowel loops and pooling in the dependent peritoneal spaces: the dome has burst under peritoneum, urine is in the peritoneal cavity, and the patient goes to laparotomy for repair.
  • Two pitfalls deserve naming.
  • First, a passive filling technique without clamping under-distends the bladder and mimics a negative study.
  • Second, clot or a catheter balloon tamponading a neck tear can mask extravasation, so a high-pressure injury pattern with a negative study still earns careful review.
  • The cystogram therefore answers one question properly, which side of the peritoneal reflection is the leak, and only when the bladder is genuinely full.
Strong pass

Say both

  • Naming the underfilled bladder as the mechanism of the false negative
  • Stating that contrast around bowel loops is the intraperitoneal signature mandating laparotomy
Examiner note
Naming the underfilled bladder as the mechanism of the false negative and stating that contrast around bowel loops is the intraperitoneal signature mandating laparotomy.
QWhen does extraperitoneal bladder rupture still need an operation?reveal answer
  • Extraperitoneal rupture heals on a draining catheter, with a small minority needing surgery, and the exceptions are worth enumerating because each one changes the indication.
  • The first is the retained catheter failure: if clot cannot be kept clear and drainage obstructs, or if urine continues to extravasate on follow-up imaging despite drainage, the bladder needs formal repair and washout.
  • The second is the bony problem: a bone fragment or spike driven into the bladder neck may need to be dealt with at orthopaedic fixation, with the bladder repaired at the same anaesthetic, which is one reason urology stands by during pelvic fixation.
  • The third is the associated injury: a bladder neck injury extending into the urethra, or a concomitant rectal or vaginal injury, converts a conservative plan into a repair, because a shared wall injury leaking into another organ space will not heal on drainage alone.
  • The fourth is the planned orthopaedic exposure: when internal fixation hardware will cross a contaminated extraperitoneal tear, repair reduces the infection risk to the metalwork.
  • The principle through all four: catheter drainage is the treatment of the tear, but it does not treat retained clot, bone, associated organ injuries or hardware, and each of those is an operative reason.
Strong pass

Say all four

  • Listing bone spike
  • Associated rectal or vaginal injury
  • Hardware contamination as the specific conversions
  • Not just failed drainage
Examiner note
Listing bone spike, associated rectal or vaginal injury, and hardware contamination as the specific conversions, not just failed drainage.
QHow do you coordinate bladder drainage with pelvic fracture management?reveal answer
  • The coordination problem is spatial: the external fixator or pelvic binder, the suprapubic corridor, the pubic surgical approaches and the bladder all occupy the same few centimetres of lower abdomen and pelvis.
  • The first decision is the catheter route.
  • A urethral catheter is the answer whenever the urethra is safe: blood at the meatus, a high-riding prostate or an inability to pass a catheter gently trigger a urethral study, and only then, if the urethra is unsafe, does suprapubic access become the plan.
  • The second decision is timing: suprapubic catheter insertion is cleanest done before fixator pins are placed, or under imaging once hardware is in the way, because a track driven past pin sites seeds the metalwork.
  • The third is the shared anaesthetic: when the orthopaedic team is fixing the pelvis, that is the moment to reassess the bladder, clear clot, repair a neck tear if indicated, and site any suprapubic catheter under direct vision rather than blind.
  • Communication is the intervention: the urology plan, catheter route, expected duration and who removes what, written into the joint notes, prevents the classic failures, a catheter nobody owns, a pin site made infected by a track, or a suprapubic catheter that orthopaedics did not know existed.
Strong pass

Say all four

  • Treating coordination as a spatial
  • Timing problem: urethral route first
  • Suprapubic before pins
  • Bladder reassessment on the orthopaedic table
Examiner note
Treating coordination as a spatial and timing problem: urethral route first, suprapubic before pins, and bladder reassessment on the orthopaedic table.
QA patient with a pelvic fracture develops peritonitis two days after a negative cystogram. What is happening and what do you do?reveal answer
  • The likeliest explanation is a missed intraperitoneal bladder rupture: the index cystogram under-filled the bladder, the wall apposed the dome tear, the study read negative, and urine has been leaking into the peritoneal cavity since.
  • Chemical peritonitis then progresses: increasing pain, distension, absent bowel sounds, tachycardia and then sepsis.
  • The differential that must be actively excluded is a missed bowel injury from the same blunt force, which presents on a similar trajectory and is the more dangerous partner.
  • Management is in sequence.
  • Resuscitate, take cultures, start broad-spectrum antibiotics and analgesia.
  • Re-image, but do not delay for a study in a deteriorating patient: a properly distended retrograde CT cystogram in a stable patient confirms contrast around bowel loops, while a peritonitic, unstable patient goes to theatre, where the diagnosis is made directly.
  • At laparotomy: lavage the peritoneal cavity, débride and close the dome tear in two absorbable layers with a general surgical colleague standing by for the bowel, inspect the bladder neck, and leave the bladder drained.
  • The missed diagnosis carries the lesson forward: fill the bladder properly the first time, and treat a peritonitic abdomen after pelvic trauma as a laparotomy problem until proven otherwise.
Strong pass

Say both

  • Naming the underfilled index study as the mechanism
  • Keeping missed bowel injury in the differential while proceeding to laparotomy in the unwell patient
Examiner note
Naming the underfilled index study as the mechanism and keeping missed bowel injury in the differential while proceeding to laparotomy in the unwell patient.
Click me next Section 8 of 8 Evidence The guidance each of these answers is built on.

Evidence and guidance

EAU Guidelines
Urological trauma
European guidance on bladder and lower urinary tract trauma: grading, imaging technique and operative indications.
Open guideline
BAUS
British Association of Urological Surgeons
UK information on urological trauma assessment and catheter drainage for patients and clinicians.
Open guideline
EAU Guidelines
Neuro-urology
Principles of catheter management and drainage strategies referenced during conservative management of bladder injury.
Open guideline
Two minutes

Close the lap: recall it before you leave.

Say it aloud, then reveal. Reading is not remembering.

  1. 01 The relationship Say the critical spatial relationship out loud, then reveal. reveal
    Memory frame

    Stand at the patient's right and look at a midline slice.

    Why?
    Behind is the sacrum, in front the sprung pubic symphysis with its fracture fragments, and between them the bladder, with the prostate and urethra descending in front of the pelvis to the perineum. Above the bladder the peritoneal reflection runs across the dome, and above that sit bowel loops: everything on the peritoneal side of that reflection is the intraperitoneal world, and a dome tear leaks into it. Below and in front, the bladder neck lies naked against the pelvic bones and the fracture haematoma: an extraperitoneal tear leaks into that space instead. The cystogram reads the two leaks by where the contrast goes, and the whole decision, catheter versus laparotomy, hangs on which side of the peritoneal reflection the tear sits.
  2. 02 The first move Missed intraperitoneal leak. Your first move? reveal
    First move

    Recognise the missed leak: increasing abdominal pain, distension, ileus and systemic upset after a supposedly negative study.

  3. 03 The escalation trigger Missed intraperitoneal leak. What makes you call for help? reveal
    Escalate when

    Peritonitis with deterioration, or a missed associated bowel injury → urgent laparotomy with general surgical support.

  4. 04 The discriminator What turns a pass into a strong pass? reveal
    Strong pass

    Say both

    • Naming the underfilled bladder as the mechanism of the false negative
    • Stating that contrast around bowel loops is the intraperitoneal signature mandating laparotomy
    Examiner note
    Naming the underfilled bladder as the mechanism of the false negative and stating that contrast around bowel loops is the intraperitoneal signature mandating laparotomy.
  5. 05 The pitfall Where does this operation bite first? reveal
    Pitfall

    The underfilled cystogram

    Why?
    an empty or half-filled bladder seals its own tears during scanning; fill to genuine distension and clamp before scanning.

Revision practice with self-marked answers, not an assessment of clinical competence. Kept in this browser only; it does not sync between devices.