What is the most common type of hip dislocation?

• A. Anterior dislocation
• B. Inferior dislocation
• C. Posterior dislocation
• D. Superior dislocation

Answer: (C)

Most hip dislocations occur when the femoral head is driven backward out of the acetabulum during high-energy trauma, with the hip typically in a position of flexion, adduction, and internal rotation. This combination makes the posterior rim of the socket more likely to fail and the head to dislocate posteriorly, so posterior dislocations are far more common than other types. Clinically, a posterior dislocation often presents with the leg shortened and held in internal rotation and adduction, whereas anterior dislocations—though possible—are less frequent and usually show abduction and external rotation. Because of the mechanics and anatomy involved, the posterior type accounts for the vast majority of acute hip dislocations.