Whether it's in preparation for surgery or being used to diagnose an injury, an X-ray is a simple and effective method for examining the inner anatomy of your knee joint. X-rays can detect broken and dislocated bones, cysts, tumors, bone diseases and swelling or deformity of the knee joint. To ensure accuracy of the imaging test, follow your doctor's preparation orders exactly -- which might occasionally include a special diet or fasting.
Traditional X-Ray
For a traditional X-ray of the knee, you will likely be situated into a standing or lying position. Once the X-ray technician positions your knee appropriately, a beam of radiation will pass through the knee joint and record an image onto a screen or piece of film. Generally, fasting is not required before a knee X-ray. In fact, an X-ray often requires no preparation other than removing objects that could obscure the image. Unless otherwise directed by your physician, feel free to eat before getting a knee X-ray.
Knee Arthrography
A knee arthrography is a special type of X-ray that requires the use of a contrast image. For this imaging test, the radiologist will inject a small amount of contrast agent directly into your knee joint. In some cases, this contrast agent will be followed by an injection of air. As the contrast agent moves through your joint, images are recorded onto a screen for live viewing. At various points through the test, still X-ray images will also be taken. Although it's unusual for an arthrography of the knee joint, your physician may ask you to fast for a few hours before the test.
Considerations
Routine X-rays of the arms, legs, chest, abdomen and head typically do not require fasting or a special pre-procedure diet. However, imaging tests of the digestive tract -- esophagus, stomach, intestines -- or major organs might require more careful preparation. To ensure the accuracy of your test, consult your physician for proper preparation techniques.
Things to Avoid
Although eating before an X-ray is not generally prohibited, do take your own personal situation into consideration. During the X-ray, you will need to stand or lie very still to ensure an accurate image. Maintaining a completely still position for several minutes could be difficult with an upset stomach or a full bladder or bowel. If you do choose to eat before the test, stick with foods that you are familiar with and avoid any foods that could give you heartburn, nausea, indigestion or gas. If possible, empty your bladder and bowel before the X-ray to ensure better comfort during the procedure.
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