When performing an AP pelvis X-ray, it is essential to internally rotate the patient’s legs 15 to 20 degrees. This adjustment ensures the femoral necks are parallel to the image receptor, resulting in a true AP position.
The femoral neck naturally projects 15 to 20 degrees anteriorly relative to the shaft of the femur. Without internal rotation, the femoral necks would appear foreshortened, reducing image quality and diagnostic accuracy.
Always remember to check for proper leg rotation before exposure. This small positioning step ensures accurate representation of the pelvis and supports effective diagnosis.
