Logan Class of December 2011

The inclusion criteria include: (1) Back and/or leg pain and radiographs (CT,MRI, plain films or myelograms) showing any one of the following: (i) instability (> 3mm translation, ,> 5 mm angulation), (ii) decreased disk height > 2mm, (iii) scarring/thickening of the annulus fibrosis, (iv) herniated nucleus pulposus, (v) vacuum phenomenon, (2 ... ................
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