Fig. 10From: Magnetic resonance arthrography of the hip: technique and spectrum of findings in younger patientsDrawings 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 lesionsBack to article page