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A standard AP radiograph of a patient with femoroacetabular impingement shows bilateral retroverted acetabula as evidenced by the COS, and prominence of the ischial spine on both sides (positive PRIS sign). In a normal hip, the ischial spine is almost never visible in the pelvic brim and most commonly lies lateral to the iliopectineal line. AR, acetabular roof; PW, posterior wall; AW, anterior wall.
