Magnetic resonance imaging mri knee magnetic resonance imaging mri of the knee uses a powerful magnetic field radio waves and a computer to produce detailed pictures of the structures within the knee joint it is typically used to help diagnose or evaluate pain weakness swelling or bleeding in and around the joint. If you have pain weakness or swelling around your knee you may need a knee mri this test can help your doctor see what might be causing your symptoms mri stands for magnetic resonance imaging . Magnetic resonance imaging mri affords high resolution visualization of the soft tissue structures menisci ligaments cartilage etc and bone marrow of the knee ligament tears can be accurately assessed with mri but distinguishing partial tears from ruptures of the anterior cruciate ligament . Magnetic resonance imaging is a medical application of nuclear magnetic resonance nmr nmr can also be used for imaging in other nmr applications such as nmr spectroscopy while the hazards of x rays are now well controlled in most medical contexts an mri scan may still be seen as a better choice than a ct scan. Number 0171 policy aetna considers magnetic resonance imaging mri studies of the knee medically necessary when any of the following criteria is met detection staging and post treatment evaluation of tumor of the knee or fitting of implants for total knee arthroplasty or persistent knee pain swelling and or instability giving way not associated with an injury and not responding to
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