Maybe not then: For true lumbar radiculopathy, there needs to be a pinching or irritation (chemically) of a nerve root in the lumbar spine. If the MRI is completely "clean", then the piriformis muscle may be causing intermittent sciatica. Also depends how far down the leg the pain is going. The lumbar facet joints can certainly cause referred pain down the leg, even past the knee. Check out the image attached.
Answered 6/10/2014
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