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Fig. 2. Crosstable lateral X-ray. (A) A preoperative bump at the anterior femoral head-neck junction (arrow). (B) Postosteoplasty of the anterior femoral head-neck junction showing improved femoral head-neck offset (arrow).

[20] (Fig. 2). A recent study has found that a classic triad of MR arthrography findings, including anterosuperior labral tear, anterosuperior cartilage defect, and abnormal alpha angle, is present in 88% of patients with cam impingement [21].

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