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Typical signs of pincer-type femoroacetabular impingement anatomy:
- The crossover sign is reflected in the AP projection with an overhanging anterior acetabular margin. The anterior and posterior walls of the acetabulum projectionally intersect midway over the femoral head creating a "figure of 8" appearance.
- There is prominently seen ischial spines indicating acetabular retroversion. These are normally not visible on anterior-posterior radiographs.