dashboard fracture

A shear fracture with a hip dislocation seen in a seated—usually front seat—passenger thrown forward, striking the knee(s) against the dashboard, transmitting axial force to a flexed and adducted femur, dislocating the hip with a tear in the posterior capsule or rupture of the posterior rim of the acetabulum by the femoral head
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dashboard fracture

Orthopedics A shear fracture with a hip dislocation seen in a seated–usually the front seat passenger who is thrown forward, striking the knee(s) against the dashboard, transmitting axial force to a flexed and adducted femur, dislocating the hip with a tear in the posterior capsule or rupture of the posterior rim of the acetabulum by the femoral head.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.