MR arthrography of the left hip
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A severe cam-type deformity is present in this patient with femoroacetabular impingement. There is also a small labral tear at the superior portion of the hip joint. The articular cartilage is intact.
In the axial HASTE images over the proximal and distal femur a femoral retroversion can be seen, i.e. the axis of the femoral neck is oriented more posteriorly than the distal reference line connecting the dorsal border of the femoral condyles.
Measurement on axial HASTE images (proximal and distal femur):
The amount of femoral anteversion is calculated by combining the measurements from the proximal and distal femur: The distal reference angle (24°) is subtracted from the proximal reference angle (20°), which results in a femoral anteversion of -4° (i.e. a femoral retroversion).