What is the most likely diagnosis?

• 37 year-old in motor vehicle accident

Frontal Radiograph of Pelvis

1. Bladder Rupture
2. Pelvic Fracture
3. Central Dislocation
4. Posterior Hip Dislocation
5. Anterior Hip Dislocation

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Answer:

 

4. Posterior Hip Dislocation

 

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Posterior Hip Dislocation

General Considerations

• Hip dislocation accounts for only 5% of all dislocations
• Posterior hip dislocations are much more common than anterior hip dislocations (90% to about 10%)
• Mechanism in posterior dislocation classically is unrestrained occupant of a motor vehicle accident, especially collisions which are head-on, in which the flexed knee strikes dash with hip flexed and adducted
• Force is transmitted from the foot or ankle along femoral shaft to the hip
• Associated with fractures of the posterior rim of the acetabulum

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