What It Is
An X ray of the humerus is a safe and painless test that uses a small amount of radiation (by mobile x ray machine or stationary x ray machine) to make images of the upper arm (between the shoulder and elbow). During the examination, an X ray machine sends a beam of radiation through the upper arm, and an image is recorded on a computer or special film. This image shows the soft tissues and the bone in the upper arm, which is called the humerus.
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 ray .
An X ray technician in the radiology department of a hospital or a health care provider's office takes the X ray. Two different pictures are usually taken of the humerus: one from the front (anteroposterior view or AP) and one from the side (lateral view).
Why It's Done
A humerus X ray can help find the cause of common signs or symptoms such as pain, tenderness, swelling, or deformity of the upper arm. It can detect a broken bone; after the bone has been set, it can help determine whether it is in proper alignment and has healed properly.
If surgery of the upper arm is required, an X ray may be taken to plan for the surgery and assess the results of the operation. Also, an X ray can help detect cysts, tumors, later stages of infection, and other diseases in the bone of the upper arm.
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