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Ilioischial line

The ilioischial line is a radiographic landmark seen on an AP pelvis X-ray.

It represents the inner (medial) cortex of the posterior column of the acetabulum—formed by the ilium and ischium.
On an AP pelvis view, it appears as a smooth curved line running from the pelvic brim down toward the ischium.

Why it matters (clinical use):

It helps assess the posterior column and medial acetabular wall.
Disruption, displacement, or irregularity of the ilioischial line can suggest acetabular fractures (especially posterior column involvement) or protrusio acetabuli (medial migration of the femoral head/acetabulum).

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