Appendix 1: Definitions of Terms (Revised During Panel ...

moderately severe functional impairment with symptoms exacerbated in extension and relieved in flexion ... which narrows the central spinal canal at 1 or 2 contiguous levels from L1–L5 that require surgical decompression. Moderate stenosis is defined as more than 25% reduction of the anteroposterior dimension compared with the next adjacent ... ................
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