Figure 1From: Femoral anteversion and tibial torsion only explain 25% of variance in regression analysis of foot progression angle in children with diplegic cerebral palsy Acetbular version (asterisk) is the angle between a line connecting the anterior and posterior acetabular bony margin and another line perpendicular to a line connecting triradiate cartilage (arrow) within pelvic bone (P) or centers of bilateral femoral heads (F). Back to article page