Sciatica, L5 Nerve Radiculopathy

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A patient found this on website regarding sciatica:

"The L5 nerve sign is shown to be easily and quickly evaluated on conventional MRI that includes axial images through S1. Our findings indicated that there is a strong correlation with L5 nerve root T2 hyperintensity, enlargement, and fascicular distortion to symptomatology. We believe that this sign is the result of chronic, severe, or repetitive L5 impingement. The presence of the L5 nerve root sign implies permanent intrinsic pathology and may predict symptoms that will be resistant to treatment." Authors Chapman and Keyes (?MRAB?)

Suggests that MRI can detect permanent nerve damage. I asked a radiologist who had not heard of this.
Has anyone heard of this L5 Nerve Sign or know where I can find more info?
 
I found this easily. It was from 2006 and although i cannot give you the website here the study was called "L5 Nerve Sign. Applying The Lessons of Peripheral Neurography to the Conventional Lurabar MRI Scan " and from the American Society of Spine Radiology. It was interesting as a lurabar patient, not sure if 37 patient study convinced me to take it to my doctor.
 
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