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Fig. 5 | Insights into Imaging

Fig. 5

From: MRI for the preoperative evaluation of femoroacetabular impingement

Fig. 5

An 18-year-old girl with pincer deformity. (a) On an axial oblique PD-weighted MRI image superiorly, the anterior rim of the acetabulum (arrow) is located lateral to the posterior rim (arrowhead), indicative of superior acetabular retroversion (blue line). Superior acetabular retroversion of 8° is shown in this example. (b) Corresponding radiograph demonstrates the "crossover" sign where the anterior acetabular wall projects (red line) lateral to the posterior acetabular wall (black dashed line) superiorly

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