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Right hip of a 31-year-old man with pincer-type FAI with (A) preoperative cranial acetabular retroversion (arrow) and slight medial joint space narrowing (dotted circle). (B) He underwent surgical hip dislocation and trimming of the acetabular rim with labral reattachement. (C) At 10-year followup he presents with an unchanged medial joint space narrowing without further degeneration.
