AP oblique SI jt position and CR
Elevate side to be examined 25 to 30 degrees , CR perpendicular entering 1 inch medial to the elevated ASIS
AP sacrum CR
15 degrees cephalic
AP coccyx
10 degrees caudad
Lateral sacrum CR
perpendicular and directed to level of ASIS and to a point 31/2 in posterior
Lateral coccyx CR
perpendicular and directed toward point 3 1/2 in. posterior to ASIS and 2 in inferior