The MRI is one of the most over-utilized tests. Yes, an MRI is a great test to look at certain structures such as the ACL and meniscus. It is an excellent test if you suspect a fracture that is not seen on x-ray. In an arthritic knee the meniscus is commonly torn as a process of the degeneration associated with arthritis. For that reason the MRI rarely adds any additional information. When patients read the report they do commonly get concerned about all of the things that are wrong, torn or degenerative.
The best, first line, radiological test for evaluating a painful knee is a plain x-ray. If trauma and a fracture are not suspected it should be weight bearing or standing.
If you see your healthcare provider don't demand an MRI. If an MRI is justified based on your exam, history or diagnosis they will most likely order it. When evaluating the painful arthritic knee the best first line radiological test is a weight bearing x-ray of the knee to evaluate your arthritic knee.
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