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MRI Knee

What is MRI of the knee?
MRI is a noninvasive medical test that helps physicians diagnose and treat medical conditions.
MRI uses a powerful magnetic field, radio frequency pulses and a computer to produce detailed pictures of organs, soft tissues, bone and virtually all other internal Body structures. The images can then be examined on a computer monitor, transmitted electronically, printed or copied to a CD. MRI does not use ionizing radiation (x-rays).
Detailed MR images allow physicians to evaluate various parts of the body and determine the presence of certain diseases.

Why should I do it?
In conjunction with conventional x-rays, MRI is usually the best choice for examining the body's major joints like the knee.
The examination is typically performed to diagnose or evaluate:

  • Knee pain, weakness, swelling or bleeding in the tissues in and around the joint
  • Damaged cartilage, meniscus, ligaments or tendons
  • Sports-related knee injuries, such as sprains, torn ligaments and torn tendons
  • Bone fractures that may not be visible on x-rays and other imaging tests
  • Degenerative joint disorders, such as arthritis
  • Build-up of fluid in the knee joint
  • Infections (such as osteomyelitis)
  • Tumors (primary tumors and metastases) involving bones and joints
  • A feeling that your knee is giving away at the joint
  • Decreased motion of the knee joint
  • Knee cap injury or pain
  • Complications related to implanted surgical devices

A special form of MRI called an MR arthrogram involves the injection of contrast material into the joint so that the radiologist can get a better look at the relevant Structures

Any preparations needed?

  • Guidelines about eating and drinking before an MRI exam vary with the specific exam.
  • The radiologist or technologist may ask if you have allergies of any kind, such as allergy to iodine or x-ray contrast material, drugs, food, the environment, or Asthma.
  • The radiologist should also know if you have any serious health problems, or if you have recently had surgery.
  • Women should always inform their physician or technologist if there is any possibility that they are pregnant.
  • If you have claustrophobia (fear of enclosed spaces) or anxiety, you may want to ask your physician for a prescription for a mild sedative prior to the scheduled Examination.
  • Jewelry and other accessories should be left at home if possible, or removed prior to the MRI scan. These items include
    • jewelry, watches, credit cards and hearing aids, all of which can be damaged.
    • Pins, hairpins, metal zippers and similar metallic items, which can distort MRI images.
    • Removable dental work.
    • Pens, pocket knives and eyeglasses.
  • People with the following implants cannot be scanned and should not enter the MRI scanning area unless explicitly instructed to do so by a radiologist or Technologist who is aware of the presence of any of the following:
    • Internal (implanted) defibrillator or pacemaker
    • Cochlear (ear) implant
    • Some types of clips used on brain aneurysms
    • some types of metal coils placed within blood vessels
  • You should tell the technologist if you have medical or electronic devices in your body, because they may interfere with the exam or potentially pose a risk, Depending on their nature and the strength of the MRI magnet. Some implanted devices require a short period of time after placement (usually six weeks) Before being safe for MRI examinations. Examples include but are not limited to:
    • Artificial heart valves
    • Implanted drug infusion ports
    • Implanted electronic device, including a cardiac pacemaker
    • Artificial limbs or metallic joint prostheses
    • Implanted nerve stimulators
    • Metal pins, screws, plates, stents or surgical staples
  • A recently placed artificial joint may require the use of another imaging procedure. If there is any question of their presence, an x-ray may be taken to detect And identify any metal objects.
  • Patients who might have metal objects in certain parts of their bodies may also require an x-ray prior to an MRI.
  • Parents who accompany children into the scanning room also need to remove metal objects and notify the technologist of any medical or electronic devices They may have.
  • Infants and young children may require sedation or anesthesia to complete an MRI exam without moving