11 acetabulum 2016-radiograph and model interpretation …...polytrauma, pelvis and acetabulum...

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4/19/2016 1 Acetabular Fracture Classification and Image Interpretation OTA Resident Comprehensive Fracture Course Polytrauma, Pelvis and Acetabulum Module Objectives Introduce acetabular anatomy Introduce classification system Introduce radiographic interpretation Emphasis on plain Xrays Don’t Make it Too Hard It’s complicated, but keep it simple Take your time Use all your imaging Patterns are important “Experts” don’t always agree on classification Anatomy Judet & Letournel (1966) Inverted “Y” Two Column Concept Columns connected to SI joint by Sciatic Buttress Anatomy of the Acetabulum Anterior Column Posterior Column

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Page 1: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

4/19/2016

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Acetabular Fracture Classification and Image Interpretation

OTA Resident Comprehensive Fracture Course

Polytrauma, Pelvis and Acetabulum Module

Objectives

•Introduce acetabular anatomy

•Introduce classification system•Introduce radiographic interpretation

•Emphasis on plain X‐rays

Don’t Make it Too Hard

•It’s complicated, but keep it simple

•Take your time

•Use all your imaging

•Patterns are important

•“Experts” don’t always agree on classification

Anatomy

• Judet & Letournel (1966)

• Inverted “Y” Two Column Concept

• Columns connected to SI joint by Sciatic Buttress

Anatomy of the Acetabulum

Anterior ColumnPosterior Column

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Have a System for Image Interpretation

•Evaluate imaging the same way every time

•Brandser E, Marsh JL. Acetabular fractures: easier classification with a systematic approach. AJR1998;171:1217‐28

Acetabular Radiographic Anatomy

“The 6 Radiographic Lines of Judet”•Anterior Wall •Posterior Wall •Sourcil (Roof)•Posterior Column ‐ Ilioischial Line)

•Anterior Column ‐Iliopectineal Line

•Teardrop (Medial Wall)

Radiographic Evaluation

•Plain Radiographs• AP Pelvis • Judet Views

• Iliac Oblique• Obturator Oblique

•CT Scan• Axial &reconstructions• 3D if available

AP Pelvis 

Visualize All 6 Radiographic Landmarks

Brandser & Marsh AJR 1998

Judet Views ‐ Iliac Oblique

Visualize Anterior Wall & Posterior Column

Page 3: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

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Judet Views ‐ Obturator Oblique

Visualize Posterior Wall & Anterior Column

CT Scans

Column Fx Transverse Fx

Column Fx

Transverse Fx

horizontal

vertical

Fracture Patterns

•Simple/Elementary Types

• Anterior Wall

• Posterior Wall

• Anterior Column

• Posterior Column

• Transverse

•Associated/Combined Types

• Posterior Column / Posterior Wall

• Transverse Posterior Wall

• Anterior Column / Posterior Hemitransverse

• T‐Type

• Both Column 

Anterior Wall

Posterior Wall

Anterior Column

Page 4: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

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Posterior Column

Transverse

Posterior Column / Posterior Wall

Transverse Posterior Wall

T‐Type

Anterior Column / Posterior Hemitransverse

Page 5: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

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Both Column 

Radiographic Analysis –Associated Types

•Both Column• Disruption of  Both Iliopectineal & Ilioischial  Lines

• Complete Detachment of Articular Surface From Ilium =  Spur Sign

Spur Sign = Both Column Fx

Systematic Approach: Pattern Recognition

Brandser & Marsh AJR 1998

Are both IP and II lines intact?

Page 6: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

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Are both the IP and II lines disrupted?

Is only the IP line disrupted?

Is only the II line disrupted?

Iliac Wing Extension?

Obturator ring extension?

Acetabulum RadiographInterpretation Cases

Page 7: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

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1.  AP pelvis

1. Iliac Oblique

1. Obturator Oblique

2.  AP pelvis

2.  AP pelvis

2. Iliac Oblique

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2. Obturator Oblique

3.  AP pelvis

3. Iliac Oblique

3. Obturator Oblique

3. 3D

4.  AP pelvis

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4. AP pelvis‐post reduction, traction

4. Iliac Oblique

4. Obturator Oblique

5.  AP pelvis

5. Iliac Oblique

5. Obturator Oblique

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5. 3D

6.  AP pelvis

6. Iliac Oblique

6. Obturator Oblique

7.  AP pelvis

7. Iliac Oblique

Page 11: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

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7. Obturator Oblique

8.  AP pelvis

8. Iliac Oblique

8. Obturator Oblique

9.  AP pelvis

9. Iliac Oblique

Page 12: 11 Acetabulum 2016-Radiograph and Model Interpretation …...Polytrauma, Pelvis and Acetabulum jointModule Objectives •Introduce acetabular anatomy •Introduce classification system

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9. Obturator Oblique

9. CT scan

9. CT scan

9. CT scan

10.  AP pelvis

10. Iliac Oblique

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10. Obturator Oblique

11.  AP pelvis

11.  AP pelvis – In Traction

11. Iliac Oblique

11. Obturator Oblique

12.  AP pelvis

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12. Iliac Oblique

12. Obturator Oblique

13.  AP pelvis

13. Iliac Oblique

13. Obturator Oblique

14.  AP pelvis

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14. Iliac Oblique

14. Obturator Oblique

15.  AP pelvis

15. Iliac Oblique

15. Obturator Oblique