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Diagrammatic representation of the morphological variants implicated in FAI that lead to increased stress on articular cartilage, prompting premature breakdown of the normal joint homeostasis and early development of OA: (A) normal; (B) “pincer” deformity of the anterior acetabulum; (C) “cam” deformity of the anterior femoral head–neck junction, after Tannast et al. (2007).
