Capsulotomy is performed using an arthroscopic blade and a diagnostic evaluation of the joint is performed. The patient was placed on the operating table (supine position right side) and the portal establishment was conducted as previously described by Weiland and Philippon. Computed tomography showed significant hypertrophy of the AIIS bilaterally, although greater on the right side. Magnetic resonance arthrography was negative for labral tear. The central edge angle was measured at 43° and the α angle at 70°. Radiographs showed bilateral crossover sign and a low extending (grade III) AIIS on the right, in addition to CAM and Pincer lesions ( Fig 2). Hip flexion and internal rotation were limited to 100° and 0°, respectively. Physical examination was positive for anterior impingement tests and pain with flexion adduction internal rotation. There was no obvious history of an inciting event or previous injury. A 21-year-old male patient presented to the hip clinic with a 4 months' history of groin pain exacerbated by squatting. Video 1 Low anterior inferior iliac spine (AIIS) decompression.
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