In this procedure, the provider performs an osteotomy, cutting a portion of the iliac, acetabular, or innominate bone of the pelvis. The iliac is the upper portion of the pelvic girdle. The acetabulum is the cup–shaped socket of the hip joint. The innominate bone is either of the two bones that form the sides of the pelvis, consisting of three fused components: the ilium, ischium, and pubis.
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