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Table 1 Group allocation.

From: Influence of preoperative nucleus pulposus status and radiculopathy on outcomes in mono-segmental lumbar total disc replacement: results from a nationwide registry

  Description HNP Radiculopathy N
DDD classic precondition no no 160
HNP-No radiculopathy HNP only yes no 68
Stenosis recess stenosis no yes 73
HNP-Radiculopathy classic contraindication yes yes 132