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Fig. 8 —Schematic (left) and radiographic (right)
presentations of protrusio acetabuli (detailed view of anteroposterior pelvic
radiograph) in 42-year-old woman. Femoral head line (H) is crossing
ilioischial line (IIL). As a consequence, femoral head extrusion index (E / [A
+ E]) is zero or even negative, acetabular index (AI") is negative, and
lateral center edge (LCE") angle increases. F = acetabular fossa.
A" = covered portion of femoral head, E" = uncovered portion of
femoral head.
