case_images: PMC3956971_01
case_images: The preoperative anterior-posterior radiograph demonstrated crossover sign at the left acetabulum indicating acetabular retroversion
case_images: 167_2013_2362_Fig1_HTML.jpg
case_images: PMC3956971_01_167_2013_2362_Fig1_HTML.jpg
case_images: Fig1
case_images: The crossover sign and posterior wall sign were identified by radiography and computed tomography indicating the presence of acetabular retroversion (Fig. 1).
case_images: A labrum tear was observed at the anterosuperior edge of the acetabulum. The articular cartilage appeared to be intact
case_images: 167_2013_2362_Fig2_HTML.jpg
case_images: PMC3956971_01_167_2013_2362_Fig2_HTML.jpg
case_images: Fig2
case_images: The arthroscopic examination revealed a full thickness labral tear at the anterior-superior region (Fig. 2).
case_images: The labrum was fixed back to the acetabulum using two suture anchors. After the labrum repair, osteochondroplasty of the femoral head was performed to prevent anterior impingement
case_images: 167_2013_2362_Fig3_HTML.jpg
case_images: PMC3956971_01_167_2013_2362_Fig3_HTML.jpg
case_images: Fig3
case_images: A labral tear was identified at the anterosuperior edge of the acetabulum, and the tear was fixed back to the rim using two suture anchors (Fig. 3).
case_images: The post-operative anterior-posterior radiograph showed improved acetabular coverage with disappearance of the crossover sign
case_images: 167_2013_2362_Fig4_HTML.jpg
case_images: PMC3956971_01_167_2013_2362_Fig4_HTML.jpg
case_images: Fig4
case_images: The post-operative radiograph showed improved acetabular coverage of the femoral head with a resultant Sharp angle of 36  and CE angle of 50 , while the crossover sign as well as the posterior wall sign was no longer evident (Fig. 4).