Posterior wall sign (femoroacetabular impingement)
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At the time the article was created Magdalena Chmiel-Nowak had no recorded disclosures.View Magdalena Chmiel-Nowak's current disclosures
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Posterior wall sign is a radiographic sign used to assess the morphology of posterior acetabular wall. A deficient posterior acetabular wall is often associated with acetabular retroversion or acetabular dysplasia, while a too-prominent posterior acetabular wall is a predisposing factor for posterior impingement.
In a normal hip, the outline of the posterior acetabular wall projects over the center of the femoral head. In case of a deficient posterior acetabular wall, its outline is visible medial to the femoral head center. Conversely, in case of a prominent posterior acetabular wall, its outline can be seen lateral to the femoral head center.