Encyclopedia / K / Knee X-ray

Knee X-ray


X-rays of the knee may be helpful in management of knee injuries.


X-rays are a form of invisible electromagnetic energy of short wavelength that is produced when high-speed electrons strike a heavy metal. X-rays can be used to produce images of bones, organs, and internal tissues. Low doses of X-rays are passed through the tissues and cast images - essentially shadows- onto film or a fluorescent screen showing structural changes in the area being examined.

X-rays play a role in diagnosing certain traumatic conditions involving the knee joint. Although, the great incidence of cartilaginous and soft tissue injuries, occurring as isolated conditions or with fractures, requires the use of additional imaging techniques for adequate evaluation of the joint capsule, articular cartilage, menisci, and ligaments.

The knee MRI (magnetic resonance imaging) gives exquisite detail of the internal structures of the knee and has largely replaced the knee X-ray in management of knee disorders.


What are the risks of X-rays?

How often can x-rays be taken?

When is a knee MRI necessary?