Our expert says:
It means that the space between the vertebrae low down in your back is narrowed at 2 levels which could cause pressure on the nerves going to the legs, which can cause pain and weakness in the lower back and legs. See the picture on http://herniateddiscdrx9000.wordpress.com/2009/04/29/sciatica-leg-pain-herniated-disc-new-york-city/
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