Fig. 1A–F.

The high developmental dislocations of the hips were classified into two subtypes. In Type C1 hips, (A) the femoral head is completely out of the true acetabulum, the ilium contacting the femoral head is sclerotic, and it articulates with the iliac wing; (B) there is osteophyte formation; and (C) a pseudoacetabulum is present. In Type C2 hips, (D) the femoral head is completely out of the true acetabulum, the femur is stovepipe shaped; (E) the femoral head has no direct contact with iliac wing; and (F) there is no pseudoacetabulum.