Posterior wall of acetabulum

The posterior wall of the acetabulum is the bony structure forming the posterior margin of the acetabular fossa contributing to the containment and stability of the femoral head. It is composed of the ischial portion of the acetabulum and extends from the posterosuperior acetabular rim down toward the ischial tuberosity. The posterior wall is contiguous with the posterior column, but is distinct in that it forms the rim and articular surface rather than the supporting columnar structure.

The posterior wall is characterized by a relatively thin bony plate that curves along the posterior aspect of the acetabulum, with its articular surface facing anterolaterally.

The posterior wall is most prominent in the posterosuperior quadrant, which is critical for hip stability, especially in the context of trauma and posterior wall fractures.