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Table 1 Inclusion and exclusion criteria

From: Clinical experiences with a PEEK-based dynamic instrumentation device in lumbar spinal surgery: 2 years and no more

Inclusion criteria

Exclusion criteria

 • Indication for monosegmental lumbar spinal fusion with osteochondrosis (Modic grades I–III) or spondylolisthesis (Meyerding grades I–III) with instability

 • Radiological signs of degeneration without instability in the level cranially adjacent to the intended fusion

 • Definition of adjacent segment degeneration using MRI (Pfirrmann grades II–IV)

• No degeneration in the segment cranial to the segment intended for fusion

• Previous lumbar surgery

• Motor deficits

• Scoliosis with a Cobb angle > 25°

• Spondylolisthesis (Meyerding grade > III)

• No prior history of metabolic bone disease

• No previous osteoporotic fracture of the lumbar vertebrae