FAI on Arthrogram

Cam FAI

Femero-acetabular impingement (Cam type)

+ tear at base of superior labrum

Acetabular Retroversion

Acetabular retroversion is associated with "pincer" type FAI. See excellent explantion here (link and images with permission from the author):

http://musculoskeletalmri.blogspot.com/2009/01/acetabular-retroversion-and-library-of.html

CAM Type FAI

CT performed with hip flexed, adducted and internally rotated