What It Is
A hip X-ray is a safe and painless test that uses a small amount of radiation to
make images of the hip joints (where the legs attach to the pelvis). During the examination,
an X-ray machine sends a beam of radiation through the pelvic bones and hip joints,
and an image is recorded on a computer or special film. This image shows the soft
tissues and the bones of the pelvis and hip joints.
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 the skin and muscles, allow the X-ray beams to pass through
them and appear darker. An X-ray technician takes the X-rays.
An X-ray technician in the radiology department of a hospital or a health care
provider's office takes the X-rays. Two different pictures are usually taken of the
hip: one from the front (anteroposterior view or AP), and one from the side (lateral
view, also known as the frog leg lateral view). Typically, X-rays of both hips are
taken for comparison, even if only one hip is causing symptoms.
Why It's Done
A hip X-ray can help find the cause of common signs and symptoms, such as limping,
pain, tenderness, swelling, or deformity in the hip area. It can detect broken bones
or a dislocated joint. If hip surgery is required, an X-ray may be taken to plan for
the surgery and, later, to see the results of the operation.
Also, a hip X-ray can help to detect bone cysts, tumors, infection of the hip joint,
or other diseases in the bones of the hips.
Preparation
A hip 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.