Extremity x-ray

Definition

An extremity x-ray is an image of the hands, wrist, feet, ankle, leg, thigh, forearm humerus or upper arm, hip, shoulder or all of these areas. The term "extremity" often refers to a human limb.

X-rays are a form of radiation that passes through the body to form an image on film. Structures that are dense (such as bone) will appear white. Air will be black, and other structures will be shades of gray.

How the Test is Performed

The test is done in a hospital radiology department or in the health care provider's office. X-ray is done by an x-ray technologist.

You will need to hold still as the x-ray is taken. You may be asked to change position, so more x-rays can be taken.

How to Prepare for the Test

Tell your provider if you are pregnant. Remove all jewelry from the area being imaged.

In general, there is no discomfort. You may be slightly uncomfortable while the leg or arm is put in place for the x-ray.

Why the Test is Performed

Your provider may order this test if you have signs of:

• A fracture
• Tumor
• Arthritis (inflammation of the joints)
• A foreign body (such as a piece of metal)

Normal Results

The x-ray shows normal structures for the age of the person.

What Abnormal Results Mean

Abnormal results may be due to:

• Bone conditions that get worse over time (degenerative)
• Bone tumor
• Broken bone (fracture)
• Dislocated bone
• Osteomyelitis (infection)
• Arthritis

Other conditions for which the test may be performed:

• Clubfoot
• To detect foreign objects in the body

Risks

There is low-level radiation exposure. X-rays are monitored and regulated to provide the smallest amount of radiation exposure needed to make the image. Most experts feel that the risk is low compared with the benefits.

Pregnant women and children are more sensitive to the risks of an x-ray.

References

Kelly DM. Congenital anomalies of the lower extremity. In: Azar FM, Beaty JH, Canale ST, eds. Campbell's Operative Orthopaedics. 13th ed. Philadelphia, PA: Elsevier; 2017:chap 29.

Kim W. Imaging of extremity trauma. In: Torigian DA, Ramchandani P, eds. Radiology Secrets Plus. 4th ed. Philadelphia, PA: Elsevier Saunders; 2017:chap 45.

Laoteppitaks C. Compartment syndrome evaluation. In: Roberts JR, Custalow CB, Thomsen TW, eds. Roberts and Hedges' Clinical Procedures in Emergency Medicine and Acute Care. 7th ed. Philadelphia, PA: Elsevier; 2019:chap 54.