Knee X-Ray: What to Expect and What It Can Show
If your doctor has recommended a knee X-ray, you may be wondering what the exam will be like and what the images can actually tell them.
The good news is that knee X-rays are usually straightforward. They are commonly used to look at the bones and joint, especially when there has been an injury, ongoing pain, swelling, or concern about changes inside the knee.
Knowing what to expect can make the appointment feel a lot less unfamiliar.
Why Might Your Doctor Order a Knee X-Ray?
A knee X-ray can help your doctor get a better look at the bones that make up the joint. It may be recommended if you have:
- Pain after a fall, twist, or other injury
- Swelling or tenderness
- Trouble putting weight on the leg
- Ongoing knee pain
- Stiffness or reduced movement
- Suspected arthritis or other joint changes
Not every knee problem requires an X-ray. Your provider will usually consider your symptoms, how the problem started, and what they find during a physical exam before deciding whether imaging is needed.
What Happens During a Knee X-Ray?
When you arrive for the exam, a technologist will position your knee so the necessary images can be taken. Depending on what your doctor ordered, you may be asked to:
- Sit or lie down
- Stand for certain images
- Bend the knee slightly
- Turn the leg into a different position
You will need to stay still for a few moments while each image is taken.
The X-ray itself does not hurt, although moving an already sore knee into position may be uncomfortable. If a position is difficult, let your technologist know. They can help you move as comfortably as possible while still getting the images your doctor needs.
Why Are Several Images Taken?
One X-ray view does not show the entire knee.
The knee is a three-dimensional joint, so images are often taken from different angles. This helps the radiologist see the bones and joint from more than one perspective.
Different views can make it easier to assess:
- Bone alignment
- Joint spacing
- Possible fractures
- Changes around the kneecap
- Other bone or joint abnormalities
In some cases, your doctor may request weight-bearing images. These are taken while you are standing so the joint can be evaluated under the pressure of your body weight.
What Can a Knee X-Ray Show?
Knee X-rays are especially useful for looking at bones and the relationship between them. They may help identify:
Fractures
- Changes in bone position
- Joint-space narrowing
- Bone spurs
- Signs of arthritis
- Certain bone abnormalities
The images are interpreted together with your symptoms and physical exam. An X-ray can provide important information, but it is rarely the only piece of the puzzle.
What Does a Knee X-Ray Not Show Well?
X-rays are not the best test for every structure inside the knee.
Soft tissues such as ligaments, tendons, cartilage, muscles, and the menisci do not show as clearly as bone.
If your doctor suspects a soft tissue injury, another imaging test may be more useful.
This is one reason a normal X-ray does not always mean there is nothing causing your knee pain.
What If the X-Ray Looks Normal but My Knee Still Hurts?
That can happen.
An X-ray may show that the bones and joint look normal while the source of pain involves a structure that the exam does not show well.
If your symptoms continue, your provider may recommend follow-up care, additional testing, or another type of imaging.
A normal X-ray can still be helpful because it may rule out certain bone problems and help narrow down what should be considered next.
Do Knee X-Rays Use Radiation?
Yes. X-rays use a small amount of ionizing radiation to create images.
When your doctor recommends an X-ray, the expected benefit of getting useful diagnostic information is weighed against the radiation exposure.
If you are pregnant or think you may be pregnant, tell your healthcare provider or technologist before the exam.
What Happens After the Exam?
Once the images are complete, a radiologist reviews them and prepares a report for your referring provider.
Your provider will then look at the report along with your symptoms and exam findings to decide whether treatment, follow-up, or additional imaging is needed.
That next step depends on what the X-ray shows and how your knee is feeling.
X-Rays in Lake Hopatcong, NJ
If your healthcare provider recommends imaging for knee pain, injury, or another joint concern, ImageCare Radiology offers X-rays in Lake Hopatcong, NJ.
X-ray imaging can help give your referring provider a clearer look at the bones and joint so they can better understand what may be contributing to your symptoms.
Knowing What to Expect Makes the Exam Easier
A knee X-ray is a simple test, but it can provide useful information when your doctor needs a closer look at the bones and joint.Understanding why different views are taken, what the images can show, and what happens after the exam can help you feel more prepared before your appointment.
And if the X-ray does not explain your symptoms completely, that information can still help your healthcare provider decide what to look at next.