• Usually, result of MVA
  • 90% posterior, +/- posterior wall or column acetabular fx
  • The mechanism is the posterior force on a flexed hip
  • Complications: sciatic nerve injury (10%), AVN of the femoral head, myositis ossificans, DJD, occasional femoral head fx
  • The femoral head comes to lie superolateral to the acetabulum
  • CT: evaluate for loose bodies in joint (if present, requires operative tx)