An AP pelvis projection obtained with the patient rotated toward the left hip demonstrates
1)the symphysis pubis rotated toward the left hip.
2)a narrower right iliac wing.
3)a narrower left obturator foramen.
4)the sacrum and coccyx rotated toward the right hip.
A) 1 and 4 only
B) 2 and 3 only
C) 3 and 4 only
D) 1, 2, 3, and 4

Question

Quizplus · Accepted Answer

When a patient is rotated toward their left hip for an AP pelvis projection, the anatomy closer to the X-ray source (in this case, the left side of the pelvis) appears larger and more open, while the anatomy further away (the right side) appears narrower. Thus, the symphysis pubis and the sacrum and coccyx appear rotated toward the left hip (1) and right hip (4) respectively, the right iliac wing appears narrower (2), and the left obturator foramen also appears narrower due to the perspective change (3).

An AP Pelvis Projection Obtained with the Patient Rotated Toward