A 62-year-old woman slips and falls on the bathroom floor. As a result, she has a posterior dislocation of the hip joint and a fracture of the neck of the femur If the acetabulum is fractured at its posterosuperior margin by dislocation of the hip joint, which of the following bones could be involved?: (A) Pubis, (B) Ischium, (C) Ilium, (D) Sacrum
Answer is C. The acetabulum is a cup-shaped cavity on the lateral side of the hip bone and is formed: superiorly by the ilium, posteroinferiorly by the ischium, anteromedially by the pubis. The sacrum and the head of the femur do not paicipate in the formation of the acetabulum.