What is the most likely diagnosis?
- 43 year-old female with hip stiffness
Frontal Pelvis Radiograph
- Dermoid
- Central fracture-dislocation
- Avascular Necrosis
- Acetabular Protrusio
- Pigmented Villonodular Synovitis
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Additional Images
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Answer:
4. Acetabular Protrusio
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Acetabular Protrusio
General Considerations
- Intrapelvic displacement of the medial acetabular wall
- Most common cause is osteoarthritis
- Primary form – Otto pelvis
- Marked female to male predominance
- Usually occurs in young to middle-aged
- Bilateral in 1/3 to 2/3 of patients
- No underlying causative mechanism is demonstrated