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Fig. 9B —Influence of direction of center of X-ray beam on appearance of acetabular depth in 22-year-old man. Arrows show herniation pit caused by cam type of femoroacetabular impingement. IIL = ilioischial line, AW = anterior wall, PW = posterior wall, F = fossa. Hip radiograph centered over hip shows apparent coxa profunda. In addition, version of acetabulum seems to be larger with anterior wall being projected more medially.