Acetabular morphologic parameters:

ANTEVERSION:
Normal ranges: 15-20′
Decreased ranges (retroversion): 10-14′
Increased ranges: 21-25′

INFERIOR PROJECTION:
Normal: 45′

…Values taken from Diane Lee – The Pelvis.

Cam deformity:
Alpha angle: >55′
Centre Edge Angle: >39′
Article: https://www.ncbi.nlm.nih.gov/pubmed/27939070

Can the crossover sign be a reliable marker of global retroversion of the acetabulum?
>The crossover sign could pick up hips with less than normal anteversion with acceptable sensitivity but it has no enough specificity for being used as the sole indication for treatment.
Article: https://www.ncbi.nlm.nih.gov/pubmed/27757494