deep-research-report(1)

Executive Summary

Pelvic ring fractures result from high-energy trauma and carry high morbidity and mortality, primarily due to massive hemorrhage【57†L83-L88】【50†L122-L127】. Prompt recognition of pelvic instability is critical for bleeding control and stabilization. Multidetector CT is now the gold standard for evaluating pelvic trauma, providing high sensitivity for fractures and detecting active arterial bleeding (contrast “blush”)【24†L269-L274】【73†L211-L219】. Understanding pelvic anatomy and ligaments is key: the posterior sacroiliac complex provides the primary stability, and disruption of the ring in two places is required for instability【13†L777-L782】【47†L85-L93】. We will review the main classification systems – Young-Burgess (mechanism-based: APC, LC, VS) and AO/OTA (stability-based: Types A/B/C) – using a comparison table. Key fracture patterns (open-book, lateral compression, vertical shear, sacral, acetabular) will be illustrated with case examples. Imaging approach (when to obtain AP pelvis radiographs, CT, CT angiography) and a systematic CT search checklist will be outlined. Common pitfalls (e.g. pelvic binder masking diastasis【52†L252-L254】【67†L1253-L1256】) and structured reporting templates will be covered. We’ll highlight what surgeons need (instability, displacement, associated injuries) and implications for management (external fixation, ORIF, angiographic embolization)【52†L264-L266】【52†L269-L277】. Interactive cases and questions are interspersed to engage the audience.

Key Points: Pelvic fractures are often complex ring injuries. Classify by mechanism and stability to predict complications and guide management. Use CT liberally in trauma – radiographs miss many injuries (radiograph sensitivity ~77%)【24†L269-L274】 – and actively look for bleeding on contrast study【52†L264-L266】. Coordinate findings with surgical management (e.g. binder placement, angiography, fixation).

Learning Objectives

• Describe pelvic anatomy and stability – understand the bony ring and ligamentous support【13†L777-L782】【47†L85-L93】.
• Apply classification systems – compare Young-Burgess (APC, LC, VS types) with AO/OTA (Type A/B/C) in a table format.
• Interpret injury mechanisms – link trauma vectors (e.g. “open-book” AP compression) to fracture patterns.
• Outline imaging strategy – indicate when to use AP radiograph, CT, and CT angiography; emphasize CT’s superiority【73†L211-L219】【24†L269-L274】.
• Implement a systematic CT search pattern – check anterior ring, posterior ring, sacrum, SI joints, organs, vascular blush systematically.
• Recognize key injury patterns – identify and classify APC, LC, VS, sacral, and overlapping acetabular fractures on imaging (with example cases).
• Avoid pitfalls – note how pelvic binders or supine positioning can mask fractures【52†L252-L254】【67†L1253-L1256】.
• Use structured reporting – formulate impressions highlighting stability and complications; review example report snippets.
• Understand surgical needs and management – know what information trauma/ortho teams need (instability, displacement, neurovascular injury) and the roles of external fixation, ORIF, angiographic embolization【52†L264-L267】【52†L269-L277】.
• Engage the audience – incorporate clinical questions and interactive cases to reinforce learning.

timeline
    title Presentation Flow
    0: "Title & Objectives (2m)"
    2: "Pelvic Anatomy & Stability (5m)"
    7: "Fracture Classifications (5m)"
    12: "Mechanisms of Injury (APC, LC, VS) (3m)"
    15: "Imaging Approach: X-ray vs CT vs CTA (4m)"
    19: "CT Systematic Search Pattern (4m)"
    23: "Key Injury Patterns & Cases (12m)"
    35: "Pitfalls and Reporting (4m)"
    39: "Surgeon’s Needs & Management (6m)"
    45: "Summary and Q&A (2m)"

Slide Schedule (≈45 min)

Section / Slide Titles	Time (min)
1. Title / Introduction	1
2. Learning Objectives	1
3–4. Pelvic Anatomy & Stability	5
5–6. Pelvic Ring Biomechanics	5
7. Break	1
8–9. Injury Mechanisms (APC, LC, VS)	4
10–11. Classification Systems	5
12. Classification Comparison Table	2
13. Imaging Approach Overview	3
14. Radiographs vs CT (Cite CT gold)	2
15. CT Angiography (bleed detection)	2
16. Systematic CT Search Checklist	4
17. Break	1
18–20. APC Injuries (with cases)	5
21–23. LC Injuries (with cases)	5
24–25. VS & Combined (with cases)	5
26. Sacral Fractures (schematic)	3
27. Acetabular Overlap Injuries	3
28. Pitfalls (binder, occult injury)	3
29. Reporting Templates (bullets)	2
30. Review/Takeaways	2
31–32. Surgeon’s Perspective	3
33–34. Management (Embolization, ORIF, Fixation)	4
35. Audience Cases/Questions	3
36. Closing Summary & Further Reading	2
Total	45

Slide 12: Classification Comparison Table (sample):

Classification	Young–Burgess (Mechanism)	AO/OTA (Stability)
Basis	Vector of trauma forces (mechanism)【57†L19-L27】	Structural stability patterns (Tile)【13†L866-L874】
Categories	APC (open-book), LC (side crush), VS (vertical shear), CM (combined)	Type A: Stable (e.g. avulsion); Type B: Rotationally unstable; Type C: Rotationally and vertically unstable【13†L866-L874】【13†L882-L890】
Examples	APC I–III, LC I–III (increasing severity)【42†L75-L84】	A1/A2/A3 (partial or complete sacrum), B1/B2/B3 (open-book, lateral compressions), C1/C2/C3 (unilateral/bilateral vertical shear)

flowchart LR
    A[Trauma pt w/ pelvic injury] --> B[AP Pelvis Radiograph]
    B --> C{Fracture Detected?}
    C -->|Yes| D[Assess Hemodynamics]
    D -->|Unstable| E[Apply pelvic binder; emergent OR/packing]
    E --> F[Stabilize → CT Pelvis (contrast)]
    D -->|Stable| G[Obtain pelvic CT w/ IV contrast (CTA)]
    G --> H{Contrast extravasation?}
    H -->|Yes| I[Angiography + Embolization; pelvic stabilization]
    H -->|No| J[Orthopedic fixation planning (ExFix/ORIF)]
    C -->|No| K[Consider CT if high-energy mechanism; else routine care]

Slide-by-Slide Outline († = speaker notes)

Slide 1 – Title / Introduction (1 min)

• Slide title: “Pelvic Fractures in Trauma: Imaging and Management”
• Bullets: Presenter name/credentials, context (Grand Rounds, R1 resident).
• Suggested image: Orthopaedic trauma photo or 3D pelvis model to open.
• †Speaker Notes: Introduce self and topic. Emphasize importance: pelvic fractures = high-energy injury often with hemorrhage. Cite: mortality tied to pelvic bleed【57†L83-L88】. Preview key topics: anatomy, classification, imaging, surgical implications. “By the end of this talk, you’ll be able to describe the main pelvic fracture patterns and what surgeons need to know.”

Slide 2 – Learning Objectives (1 min)

• Slide title: “Learning Objectives”
• Bullets: (From above list) e.g. Describe pelvic stability ligaments; Compare Young–Burgess vs AO classifications; Outline imaging workflow; Recognize key injury CT patterns; Identify pitfalls; Explain reporting focus and surgeon requirements.
• †Speaker Notes: Quickly read objectives to audience. Emphasize systematic approach and interactivity (cases, questions).

Slides 3–4 – Pelvic Anatomy & Stability (5 min)

• Titles: “Pelvic Ring Anatomy” / “Ligamentous Stability”
• Bullets: Outline bony ring (sacrum + ilia/pubi); note internal vs external iliac vessels, pelvic venous plexus (major bleed source)【13†L848-L852】【50†L122-L127】. Emphasize that the posterior SI complex (posterior sacroiliac ligaments) is the primary tension band【13†L809-L814】. State “two breaks” rule: a ring needs ≥2 disruptions to displace【13†L777-L782】.
• Suggested images: (Slide 3) Diagram or labeled CT of pelvis; (Slide 4) Illustrations of major ligaments (e.g., posterior SI). A 3D pelvic CT recon or labeled bone model is high yield.
• Figure: For Slide 3, show Figure: anatomic pelvis labeled (via Creative Commons source).
• †Speaker Notes: Explain stability: The pelvis is a ring – one break (e.g., isolated pubic ramus) is usually stable. The posterior ligaments (esp. posterior SI) resist vertical shear【13†L809-L814】. Corona mortis variant artery (pubic branch of obturator) is a key surgical landmark (risk in pubic rami fractures). Note 85–90% pelvic bleeding is venous (presacral plexus)【50†L122-L127】, vs ~10–15% arterial (eg. superior gluteal).

Slide 5 – Injury Mechanisms Overview (5 min)

• Title: “Mechanisms of Pelvic Ring Injury”
• Bullets: Summarize Young–Burgess types:
  • Anterior-Posterior Compression (APC): “open-book” opening of pelvis from front.
  • Lateral Compression (LC): hemipelvis crushed inward.
  • Vertical Shear (VS): one hemipelvis shifts cephalad.
  • Combined Mechanisms also possible. Each has subtypes I–III (increasing severity).
• Figure: “Young-Burgess Classification”【58†embed_image】 Figure: Diagrams of APC, LC, VS force vectors (Young-Burgess classification) with examples of each type.
• †Speaker Notes: Use diagrams (slide image) to explain vectors: e.g. APC = force front-to-back; LC = force from side; VS = axial force. Emphasize patterns: open-book (APC) widens pubis and SI joints, high bleed risk; LC often compresses sacrum (impaction fractures); VS is both vertical and rotationally unstable. Cite Radiographics: “Radiologists should be familiar with Young-Burgess classification as an algorithmic approach”【57†L19-L27】.

Slide 6 – Young-Burgess Classification (Table) (2 min)

• Title: “Young–Burgess Classification”
• Bullets: Tabulate or bullet APC, LC, VS with key features:
  • APC I-III (I: symphysis <2.5 cm, II: >2.5 cm w/ ant SI diastasis, III: complete SI disruption【42†L76-L84】).
  • LC I-III (I: pubic ramus + sacral wing fracture; II: extends to iliac wing (“crescent”); III: LC on one side, APC on opposite【42†L85-L93】).
  • VS: hemipelvis displaced upward (often multiple fractures).
• Suggested images: Sketch or diagrams from Orthobullets/UW site for each. (Slide 6 can pair with Slide 5).
• †Speaker Notes: Walk through table, pointing out which pattern is most unstable (e.g. APC III and VS have highest shock risk【42†L93-L98】). Note “windswept pelvis” for LC3 (LC + contralateral APC) and that VS has greatest mortality.

Slide 7 – AO/OTA (Tile) Classification (5 min)

• Title: “AO/OTA Pelvic Classification (Tile)”
• Bullets: Overview of Type A/B/C:
  • Type A (Stable): e.g. avulsion fractures, isolated iliac wing.
  • Type B (Partially unstable): rotationally unstable, vertical stable (open-book APC or lateral crush)【13†L882-L890】.
  • Type C (Unstable): rotationally and vertically unstable (both anterior and posterior ring disrupted)【13†L915-L923】.
• Table: Compare Young–Burgess categories to AO types (see previous table slide for more detail).
• †Speaker Notes: Emphasize AO/OTA is focused on stability. Type A (fracture doesn’t affect ring integrity) vs B (rotational unstable; think LC and APC injuries) vs C (vertical shear; both sides broken). Cite Orthobullets: Type A = stable, B = rotationally unstable, C = both rotational and vertical instability【13†L866-L874】【13†L915-L923】. Discuss how Young-Burgess mechanistic types map onto these (e.g. APC3 and VS ≈ C; LC and APC2 ≈ B).

Slide 8 – Classification Comparison Table (2 min)

• Title: “Comparison: Young-Burgess vs AO/OTA”
• Bullets: Show the table from “## Slide Schedule” section.
• †Speaker Notes: Point out that both systems aim to predict instability and guide treatment. AO/OTA is more recent (2018 compendium) and includes fracture morphology (e.g. sacral involvement) but still uses “Burgess labels” for orientation.

Slide 9 – Imaging Approach Overview (3 min)

• Title: “Imaging Workflow: XR vs CT vs CTA”
• Bullets:
  • Initial XR (AP Pelvis): Part of ATLS initial survey【67†L1081-L1089】. Quickly screens for gross diastasis or pelvic injury.
  • Indications: Any suspected pelvic fracture, especially if unstable or hemodynamically compromised.
  • Limitations of XR: Misses many fractures (sensitivity ~77%)【24†L269-L274】. It can only raise suspicion.
  • Multi-detector CT: Gold-standard for all pelvic fracture cases【73†L211-L219】. Use contrast phase to detect active bleeding (blush).
  • CT Angiography: If contrast extravasation or hemodynamic instability, can proceed directly to angio suite.
• Suggested images: Example AP pelvic X-ray (open-book) vs CT axial pelvis.
• †Speaker Notes: Explain that in trauma we often get a pelvic binder and AP X-ray in the ER【52†L248-L254】. However, a normal X-ray does not rule out serious injury【24†L269-L274】. “CT is gold standard”【73†L211-L219】 and should be performed once patient is stabilized. Always consider contrast phase: about 80% of pelvic bleeds are venous, but arterial bleeds (~15–20%) will show contrast extravasation.

Slide 10 – Pelvic Radiographs (2 min)

• Title: “Pelvic X-Ray Views”
• Bullets:
  • AP pelvis view: main initial radiograph【67†L1081-L1089】. Use as ATLS screen; look for symphyseal or SI diastasis (open-book), iliac wing fractures, rami fractures.
  • Inlet/outlet views: In trauma (CT era, less often done routinely, but useful for rotational vs vertical displacement). Inlet best for AP displacements and rotation; Outlet best for vertical displacement (sacral vertical shear)【67†L1093-L1102】【67†L1118-L1126】.
  • Flamingo view: rare (standing single-leg) for chronic instability.
  • Critique AP pelvis: ensure no rotation (sacrum midline)【65†L701-L710】. Recognize “shoulder” lines (iliopectineal/ilioischial lines) on X-ray for column fractures.
• †Speaker Notes: Stress that AP view is mandatory for all trauma. Note pitfalls: if a binder is in place, it may temporarily “reduce” an open-book fracture on X-ray【52†L252-L254】. If pelvis is imaged with binder, be aware of possible false-negative.

Slide 11 – CT Pelvis Protocol (2 min)

• Title: “CT Pelvis Imaging Protocol”
• Bullets:
  • Use multiphase CT: (arterial and portal-venous phases) from diaphragm to proximal femora. Optimize to detect bone, vascular and organ injuries.
  • Pan-scan: thorax + abdomen + pelvis in polytrauma. Include abdomen CTA for bleed.
  • Thin slices (≤1.5 mm) for multiplanar reconstructions (axial, coronal, sagittal, and 3D bone recon)【67†L1150-L1158】.
  • Signs of active bleeding: contrast “blush” or pooling indicates arterial hemorrhage【52†L264-L266】. Note: absence of blush doesn’t rule out venous bleeding.
• †Speaker Notes: Confirm that all major trauma get contrast CT. Vendors often have “pelvis CT trauma” protocols. Coronal/sagittal views are especially helpful to assess sacral vertical displacement (CT shows cranial displacement better than AP X-ray【60†L848-L856】). Note if CTA shows blush, inform trauma team for possible angio.

Slide 12 – Systematic CT Search Pattern (4 min)

• Title: “CT Evaluation Checklist”
• Bullets: (stepwise bullet format)
  • Anterior ring: pubic symphysis and rami (look for diastasis, fractures of pubis/ischium).
  • Posterior ring – Iliac wings & SI joints: fractures of iliac wing, SI joint widening, sacroiliac ligament disruption (look at sacral ala).
  • Sacrum: identify sacral fractures (vertical, U- or H-shaped). Note Denis zones. (And look for sacral dysmorphism signs【67†L1160-L1170】.)
  • CT Angio: if IV contrast, scan arterial phase for blush (often evaluate source vessel – internal iliac branches).
  • Other findings: bladder/rectal injury (e.g. extraperitoneal contrast), abdominal viscera injuries, pelvic organ injury. Check for associated acetabular or hip fractures.
  • 3D reconstructions: can help visualize complex fracture lines for surgical planning.
• Figure: (Inset on slide) a sample annotated CT pelvis axial image with arrows pointing to fracture/displacement (source: a case image or stock).
• †Speaker Notes: Emphasize a “head-to-toe” CT review: start from pubis/symphysis then trace laterally and posteriorly. Use bone windows for subtle lines. Always evaluate contrast: extravasation=arterial bleed【52†L264-L266】. Look for related injuries: e.g., urethral/bladder (clues: pelvic hematoma, catheter failure).

Slides 13–15 – Key Injury Patterns: APC (5 min)

• Titles: “Injury Pattern: APC I–III” (3 slides with cases)
• Bullets per slide:
  • APC-I: Minor symphyseal diastasis (<2.5 cm); pubic rami fracture or symphyseal widening. Image: AP X-ray with mild widening.
  • APC-II: Symphyseal diastasis >2.5 cm; anterior SI ligaments disrupted. Image: AP X-ray showing wide pubis, partial SI widening.
  • APC-III: Complete SI disruption (posterior ligaments torn); pelvis essentially “open.” Usually massive diastasis and vertical instability. Images: (a) AP X-ray with >2.5 cm pubic gap, SI separation; (b) CT axial showing SI joint dislocation and sacral fracture; (c) maybe 3D CT of pelvic ring.
  • Teaching points: These create a large pelvic volume (↑hemorrhage risk). External rotation of hemipelvis. Watch for bladder or urethral injury.
• Case Images: Each slide shows a different real case (CT or X-ray) annotated with arrows. (E.g., [60] from Khurana cases if possible, or Radiopaedia open images).
• †Speaker Notes: For each subtype, point out on images: eg. APC-III in slide 15 image, note SI joint disruption and discuss how posterior ligament rupture makes it fully unstable. Emphasize that APC injuries often need external fixation or plating of symphysis (orthopedic fixation) plus possible angio if bleed persists. Discuss CT findings vs X-ray (X-ray might underestimate if binder present).

Slides 16–18 – Key Injury Patterns: LC (5 min)

• Titles: “Injury Pattern: LC I–III” (3 slides)
• Bullets:
  • LC-I: Ipsilateral pubic rami + ipsilateral sacral ala (impaction) fracture. Most common type. Image: CT showing anterior rami fractures and sacral wing compression.
  • LC-II: Above plus iliac wing fracture (crescent fracture dislocation of SI). Image: 3D CT or axial CT showing crescent fragment.
  • LC-III: LC on one side with contralateral external rotation (“windswept” pelvis). Rare, pedestrian vs auto. Image: AP X-ray demonstrating ipsi medializing rotation and contra diastasis.
  • Teaching points: LC injuries are rotationally unstable but vertically stable. Often associated with rami fractures. The injury vector on side of impact.
• †Speaker Notes: Highlight that LC may have smaller pelvic volume change, but can cause bone bleeding and visceral injury (e.g. bladder). Emphasize how LC can be under-appreciated: a pelvic binder may actually improve alignment. Note that Type II “crescent” often requires ORIF of ilium. CT is crucial to see sacral impaction line which X-ray misses.

Slides 19–20 – Key Injury Pattern: VS (5 min)

• Titles: “Vertical Shear (VS) Fractures” (2 slides)
• Bullets:
  • High vertical force; hemipelvis displaced cranially. Unstable both rotationally and vertically. Often single hemipelvis (e.g. from fall on one leg).
  • Image: (Slide 19) AP X-ray: pubic symphysis widening, one ilium riding up. (Slide 20) Sagittal/Coronal CT: show vertical shift of sacrum/ilium.
  • May include spinopelvic dissociation (U- or H-shaped sacral fracture) in VS. Look at coronal CT for sacral kyphosis.
  • Teaching points: VS has highest mortality (up to 25%) due to hemorrhage【42†L95-L98】. Often multiple injuries (spine, pelvis, vascular). Check for ilio-lumbar ligament rupture.
• †Speaker Notes: On images, point out cranial displacement and diastasis. Compare to APC: VS tends to have one hemipelvis moving upward, while APC opens out. Stress VS is rare but devastating. Surgical fixation often requires both anterior and posterior stabilization.

Slide 21 – Sacral Fractures (3 min)

• Title: “Sacral Fracture Patterns”
• Bullets:
  • Vertical (U or H-pattern): Frequently from VS (spinopelvic dissociation). U-shaped: both vertical limbs + transverse component.
  • Horizontal (transverse): Pelvic take-off e.g. LC injury hitting S1-2 (Denis Zone I-III).
  • Mention Denis classification of sacral zones (if time).
  • Pitfall: High sacral fractures can be missed on AP X-ray. CT sagittal is useful.
• Suggested image: CT sagittal sacrum showing “U-shaped” fracture line.
• †Speaker Notes: Summarize: vertical sacral fractures are unstable (if multiple levels). Lower zone sacral fractures (Denis III) risk cauda equina injury; refer to neurosurgeon.

Slide 22 – Acetabular Overlap (3 min)

• Title: “Acetabular Involvement”
• Bullets:
  • Pelvic ring fractures can involve acetabulum (particularly LC injuries or VS), complicating stability.
  • Mention Letournel/Judet acetabular classification briefly – focus on association.
  • Image: AP pelvis X-ray or CT showing posterior column acetabular fracture with pelvic ring fracture.
  • Teaching point: Always assess hip joint if pelvic trauma – dislocation or fracture through acetabulum alters fixation plan.
• †Speaker Notes: Emphasize overlap with hip fractures: e.g. “associated both columns” can accompany LC injuries. Surgeons need to know if acetabulum is involved for ORIF planning.

Slide 23 – Imaging Pitfalls (3 min)

• Title: “Pitfalls in Pelvic Imaging”
• Bullets:
  • Pelvic Binder effects: Binder can reduce and mask diastasis – AP X-ray/CT may appear falsely normal【52†L252-L254】【67†L1253-L1256】. Always consider “binder-off” imaging or exam when safe.
  • Supine Position: AP pelvis may not show vertical displacement (the “tilt” effect). Use CT/outlet view to catch cranial shift【60†L848-L856】.
  • Subtle Fractures: Isolated sacral ala or pubic rami cracks. High index of suspicion in trauma with pelvic pain. If in doubt, say “? occult pelvic fracture – recommend CT.”
  • Bladder/urethra: Hematuria or pelvic hematoma suggests GU injury; consider CT cystogram (CT bladder protocol).
• †Speaker Notes: Stress that avoid being fooled by a negative initial film with binder. Cite StatPearls: up to 47% of pelvic injuries can be missed on initial imaging with binder【52†L252-L254】. Remind to coordinate clinical info: e.g. male with straddle injury – evaluate urethra.

Slide 24 – Structured Reporting (2 min)

• Title: “Report Templates & Impressions”
• Bullets:
  • Impression Recommendations: Start with fracture description (classification name, displaced vs nondisplaced). Emphasize instability (e.g. “pelvic ring disruption consistent with APC-III, unstable”).
  • Note key findings: symphyseal diastasis (mm), SI joint widening, sacral fractures (zones), presence of hematoma or contrast blush, associated organ injuries.
  • Example phrase: “Unstable pelvic ring injury: pubic symphyseal diastasis of 3.0 cm with widening of the right SI joint and comminuted left sacral ala fracture (AO Type C3). Large presacral hematoma present. No bladder rupture seen. CTA demonstrates active extravasation from a branch of the right internal iliac artery (arterial phase blush) suggestive of arterial bleeding.”
  • Structured Report Tip: Use bullet point template: technique, findings (anterior ring, posterior ring, viscera, vessels), impression.
• †Speaker Notes: Emphasize clarity: surgeons want a concise summary of stability. Use bullet impressions (if system allows) or short paragraphs. Always answer: “Is this fracture stable or not? Does it explain shock?” Provide measurements (e.g. symphyseal gap).

Slide 25 – What Surgeons Need (2 min)

• Title: “Orthopedic Trauma Perspective”
• Bullets:
  • Surgeons want to know: stability and displacement, with classification name (to apply treatment algorithm)【57†L19-L27】.
  • Associated injuries: bladder/urethra rupture, nerve injury (sacral plexus), ligament tears (SI).
  • Soft tissue: open fractures or Morel-Lavallée lesions (degloving).
  • Hemorrhage: any contrast blush or large hematoma.
  • Use terms: “externally rotated hemipelvis,” “anterior SI diastasis,” “vertical height difference.”
• †Speaker Notes: Mention that trauma/ortho surgeons often reconstruct the mechanism in their mind. Radiology should “speak their language” (e.g. “APC-III = ‘open book’ with posterior SI disruption”). Quote: “Pelvic stability depends largely on the posterior tension band【47†L85-L93】.”

Slide 26 – Vascular Injuries & Embolization (2 min)

• Title: “Pelvic Hemorrhage Management”
• Bullets:
  • Major bleeding sources: pelvic venous plexus (most common) vs arterial (internal iliac branches: superior gluteal, etc.)【50†L122-L127】.
  • On CT, contrast extravasation (“blush”) is a strong indicator for angiography (sensitivity ~80%【52†L264-L266】).
  • IR embolization (selective internal iliac branch coils) is used for arterial bleeds. It stabilizes hemorrhage rapidly.
  • If hemodynamically unstable, may need pelvic packing or external fixation before/alongside CT【52†L269-L277】. A binder itself often provides enough compression for venous bleeds【52†L281-L284】.
• †Speaker Notes: Emphasize that early interventional radiology (angio) can be lifesaving. From StatPearls: IV contrast blush has ~84% sensitivity for arterial bleed【52†L264-L266】. If the patient is too unstable for CT or IR, emergent OR (external fix, pelvic packing) may be used; binder is often used until definitive fixation.

Slide 27 – External Fixation & ORIF (2 min)

• Title: “Surgical Stabilization Options”
• Bullets:
  • External fixation: Indicated for open-book or VS (APC, VS) with instability to reduce pelvic volume; quick life-saving measure【67†L1253-L1256】. Pins into iliac crest or ASIS. Temporary, often used with binder.
  • Internal fixation (ORIF): For definitive fixation of symphysis and SI (anterior plating, sacroiliac screws) once patient stabilized. Approach depends on fracture (e.g. anterior plate vs ilioinguinal approach).
  • Pelvic C-clamp: Rarely used, mainly for acute stabilization of posterior ring hemorrhage.
  • Non-op: Only for stable (Tile A or minimal LC/LC I injuries).
• †Speaker Notes: Convey that radiology calling out “instability” prompts quick surgical planning. If external fixator is placed emergently, note that CT may still be obtained after without removing it (some studies show binder can remain)【52†L275-L278】. Mention the typical hardware seen on post-op films.

Slide 28 – Reporting & Conclusions (2 min)

• Title: “Key Points & Take-Home”
• Bullets:
  • Always look for ≥2 disruptions to call it “unstable.”
  • Use CT extensively; do not rely on X-ray alone【24†L269-L274】【73†L211-L219】.
  • Classify injuries by mechanism AND stability – report both (surgeons use both).
  • Look for vascular injuries – if present, highlight them (they drive management)【52†L264-L267】.
  • Pitfalls: pelvic binders can mask injuries – “binder-off” imaging recommended if safe【52†L252-L254】.
  • Communicate clearly in impression: classification, displacement, bleeding, key associated injuries.
• †Speaker Notes: Summarize the lecture’s message. Encourage questions. Suggest further reading (e.g., Radiographics 2014 by Khurana【57†L19-L27】, RSNA guidelines, AO treatment manuals).

Additional Material: Provide a slide or handout of selected references and recommended reading (e.g. Radiographics 2025, AJR articles, trauma society guidelines) for interested audience.