File:Hip AP view radiographic signs.png

Summary

Schematic of left hip as seen on anteroposterior views of pelvis demonstrate radiographic signs of (a, b) general overcoverage of the acetabulum or (c–e) focal overcoverage of the acetabulum due to acetabular retroversion. (a) Coxa profunda with floor of acetabular fossa (red line) overlapping ilioischial line (dashed line). (b) Protrusio acetabuli with medial aspect of femoral head (red line) overlapping ilioischial line (dashed line). (c) Crossover sign, also known as “figure of eight” sign. Superior aspect (solid green line) of anterior acetabular wall (dashed green line) crosses over posterior wall to the lateral side. (d) Posterior wall sign with center of femoral head (red dot) located lateral to posterior acetabular wall (red line). (e) Ischial spine sign with shape of ischial spine protruding medial of pelvic rim.

From Sutter, R., Zanetti, M., & Pfirrmann, C. W. A. (2012). New Developments in Hip Imaging. Radiology, 264(3), 651–667. doi:10.1148/radiol.12110357

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