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The patterns of degeneration including joint space narrowing (A–D) and osteophyte formation (E–F) are shown for protrusio hips (A, B, E, F) and classic FAI (C, D, G, H). Both preoperative joint degeneration (A, C, E, G) and degenerative changes at followup are shown (B, D, F, H). *Significant difference pre- versus postoperative; †significant difference between the two study groups.
