PMC3956971_01
The preoperative anterior-posterior radiograph demonstrated crossover sign at the left acetabulum indicating acetabular retroversion
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Fig1
The crossover sign and posterior wall sign were identified by radiography and computed tomography indicating the presence of acetabular retroversion (Fig. 1).
A labrum tear was observed at the anterosuperior edge of the acetabulum. The articular cartilage appeared to be intact
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Fig2
The arthroscopic examination revealed a full thickness labral tear at the anterior-superior region (Fig. 2).
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
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Fig3
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).
The post-operative anterior-posterior radiograph showed improved acetabular coverage with disappearance of the crossover sign
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Fig4
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).