What It Is
A pelvis X-ray is a safe and painless test that uses a small amount of radiation
to take a picture of the pelvic bones, which surround the hip area.
During the examination, an X-ray machine sends a beam of radiation through the
pelvis and an image is recorded on special film or a computer. This image shows the
bones of the pelvis, which include the two hip bones, plus the sacrum and the coccyx
(tailbone).
The X-ray image is black and white. Dense body parts that block the passage of
the X-ray beam through the body, such as bones, appear white on the X-ray image. Softer
body tissues, such as muscles and fat, allow the X-ray beams to pass through them
and appear darker.
An X-ray technician takes the X-rays in the X-ray department of a hospital or outpatient
radiology center. One to two pictures are usually taken of the pelvis, one with the
legs straight from the front (anteroposterior or AP view) and one with the legs bent
from the side (lateral view). The X-rays are taken while the patient is lying flat
on his or her back.
Why It's Done
A pelvic X-ray can help find the cause of symptoms such as pain, swelling, or deformity
in the pelvic, hip, or upper leg regions, and can detect broken bones after an injury.
If pelvic surgery is required, an X-ray may be taken to plan for the surgery and,
later, to see the results of the operation. Also, pelvic X-rays may detect other problems
such as cysts, tumors, and later-stage infections of the pelvic bones.
Preparation
This X-ray doesn't require any special preparation. Your child may be asked to
remove some clothing, jewelry, or any metal objects that might interfere with the
image.
If your daughter is pregnant, it's important to tell the X-ray technician or her
doctor. X-rays are usually avoided during pregnancy because there's a small chance
the radiation may harm the developing baby. But if the X-ray is necessary, precautions
can be taken to protect the fetus.