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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 acetabulum projecting more laterally than the posterior rim proximally, but correcting more distally with progressive medial projection.

fig7-300x234 Crossover Sign Orthopedia

Crossover sign indicated by arrow. From: Rylander L, Froelich J, Novicoff W, Saleh K. Femoroacetabular Impingement and Acetabular Labral Tears. ORTHOPEDICS. 2010; 33: 342-350. doi: 10.3928/01477447-20100329-21 [link]

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