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Crossover Sign

Crossover Sign of the Hip/Acetabulum The crossover sign is a radiographic finding that is often associated or discussed in the setting of hip impingement, namely femoracetabular impingement (FAI). The crossover sign is indicative of acetabular retroversion, which causes pincer-type FAI. The crossover sign is associated with focal cranial retroversion, and on AP pelvic radiographs is characterized by the anterior rim of the…

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