Which aspect of the acetabulum is not an articulating surface?

Question

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The acetabulum is a deep, cup-shaped structure that articulates with the head of the femur to form the hip joint. It is composed of the ilium, ischium, and pubis bones. The articulating surface is covered with cartilage and faces anteriorly, posteriorly, and superiorly, but not inferiorly. The inferior aspect of the acetabulum is non-articular and serves as a site for the attachment of ligaments.

Which Aspect of the Acetabulum Is Not an Articulating Surface