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Developmental hip dysplasia may be unilateral or bilateral and includes subluxated or dislocated hips and malformed acetabula .
Thus, to describe the mechanism of attachment, we must describe both how pressure can be reduced in the acetabulum and how a seal can be formed with the surface of attachment.
Immediately anterior to this buttress, a small, deep concavity is located along the anterodorsal margin of the acetabulum .
Both the meridional muscle bundles and the circular muscle bundles of the acetabulum will, upon contraction, decrease the circumference and thereby increase the thickness of the acetabular wall.
In this operation both the head of the femur and the acetabulum are replaced (total hip arthroplasty).
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