Plain x-rays are x-rays that do not demonstrate the planes of
bone-on-bone as well as other x-rays such as MRI's.
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Yes, they are!
Extra: They are absorbed by bone and metal.
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If X-Rays did not exist, then people would not know how severe
their broken bone is, or they would not know if they have broken a
bone in an injury. X-Rays are very important because they help you
with your health and your bones.