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Drawings of the pathophysiology of FAI. Left Normal hip: normal range of movement without impingement while medial rotation. Middle Cam-type of FAI: when hip rotates medially, the hypertrophied anterior head-neck junction bumps into the acetabulum and anterior labrum. Right Pincer-type of FAI: acetabular over-coverage causes early contact between the acetabulum and femoral neck, and contrecoup postero-inferior degenerative lesions
